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  • 1.
    Vieira, Tiago
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Lundberg, Joacim
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Genell, A.
    Swedish National Road and Transport Research Institute, Linköping, Sweden.
    Sandberg, U.
    Swedish National Road and Transport Research Institute, Linköping, Sweden.
    Blomqvist, G.
    Swedish National Road and Transport Research Institute, Linköping, Sweden.
    Gustafsson, M.
    Swedish National Road and Transport Research Institute, Linköping, Sweden.
    Janhäll, S.
    RISE Research Institutes of Sweden, Gothenburg, Sweden.
    Erlingsson, S.
    University of Iceland, Reykjavík, Iceland.
    Porous pavement for reduced tyre/road noise and improved air quality - Initial results from a case study2019Inngår i: Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019, 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One possible solution to reduce noise resulting from tyre-pavement interaction is to use a porous pavement surface. A porous surface will reduce noise by decreasing air pressure gradients in the tyre-pavement contact as well as by decreasing the acoustical impedance of the road surface and reducing the horn effect. While reducing noise, other functional aspects of a pavement such as abrasion wear which impacts on air pollution through generation and suspension of particles, friction and rolling resistance need to be addressed. This paper analyses the acoustical behaviour of a Double Layered Porous Asphalt (DLPA), applied in the city of Linköping, Sweden, as a solution to mitigate noise, compared to a non-porous Stone Mastic Asphalt (SMA) pavement used as reference. The analysis is based on Close Proximity noise measurements, both in absolute value and as frequency spectra, acoustical homogeneity over the surface length and sound absorption measurements. The acoustic analysis is combined with analyses of air quality measurements of PM10 (Particulate Matter with aerodynamic diameter < 10 µm) from two Tapered Element Oscillating Microbalance (TEOM) measurement stations placed near each different pavement section. The initial results indicate that the porous pavement results in a noise reduction of up to 5 dB for light vehicles, and up to 4 dB for heavy vehicles. So far, the DPLA shows approximately 52 % lower PM10 concentrations than the SMA. It should be noted that PM10 is influenced also by meteorological conditions, like humidity, background sources as well as vehicle properties, e.g. use of studded tyres, and that some of the observed decrease can be due to other aspects than porosity e.g. road surface moisture and wind direction. In conclusion, the use of a porous pavement shows promising results from both acoustical and air quality aspects, given the initial, short term result

  • 2.
    Lundberg, Joacim
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. VTI - Statens Väg- och Transportforskningsinstitut.
    Janhäll, Sara
    VTI - Statens Väg- och Transportforskningsinstitut.
    Gustafsson, Mats
    VTI - Statens Väg- och Transportforskningsinstitut.
    Erlingsson, Sigurdur
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap. VTI - Statens Väg- och Transportforskningsinstitut / Islands Universitet.
    Calibration of the Swedish Studded Tyre Abrasion Wear Prediction Model and the Implication for the NORTRIP Road Dust Emission Model2018Inngår i: Transportation Research Board 97th annual meeting, Washington, D.C., 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An experimentally based prediction model of rut development due to studded tyres is available in 3 Sweden and which had been found to work well. However, since it has not been validated since 4 2007, during which traffic as well as road and tyre design have developed, the question has 5 arisen regarding the model’s current validity. Also, since the prediction model is used in the 6 NORTRIP (NOn-exhaust Road Traffic Induced Particle emission) emission model, a natural 7 question is how a change in the wear model will affect the emission model. In this paper, two 8 versions of the abrasion model are compared to measurements at several recently constructed 9 roads in Sweden to investigate the validity, while also proposing changes to allow for continued 10 use. In addition, the impact on NORTRIP is briefly investigated. The paper first describes the 11 abrasion models and their calibration, as well as the test sections for calibration. Both versions of 12 the model, as expected, overestimated the wear and an update was suggested. It was also found 13 that NORTRIP is indicatively affected by overestimating the contribution of pavement wear to 14 the emissions.

  • 3.
    Frolovskaia, A. , V
    et al.
    Russia.
    Deordiev, S. , V
    Russia.
    Falk, Andreas
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Klinduh, N. Y.
    Russia.
    Terehova, I. I.
    Russia.
    Experience of light thin-walled structures improvement in construction2018Inngår i: 6TH INTERNATIONAL CONFERENCE ON MECHATRONICS AND CONTROL ENGINEERING (ICMCE 2017), IOP PUBLISHING LTD , 2018, artikkel-id UNSP 012004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The authors on the basis of practical experience have analyzed low-rise construction with the use of energy-saving technologies. Characteristic features of possible variants of frame construction are looked at and described. The relevance of the paper consists in the improvement of the building frame design solution based on the analysis and elimination of disadvantages taking into account consumers' point of view.

  • 4.
    Ghafoori Roozbahany, Ehsan
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Partl, Manfred
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Guarin, Alvaro
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Influence of layer thickness on the flow of asphalt under simulated compaction2018Inngår i: Bearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017, CRC Press/Balkema , 2018, s. 1435-1441Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Compaction is one of the most important phases in the life cycle of asphalt pavements and has therefore been a hot subject of research for a long time. However, despite of valuable research efforts on this topic, a remarkable gap between laboratory and field measurements still remains. Moreover, whereas most of the experimental methods are carried out on compacted pavement material, methods for evaluating compactability of asphalt mixtures for increasing the fundamental knowledge about internal movements within the asphalt during compaction are only scarce. Hence, in this study, a recently developed tool for simulating the compaction process with respect to the particle flow, i.e. Compaction Flow Test (CFT), was used along with simultaneous X-ray imaging for investigating the impact of thickness changes on two different asphalt mixture structures in terms of the compaction effort as well as flow pattern differences. The results of the investigation provided reasonably useful input for building up a better understanding of the behavior of mixtures under compaction loads. This method was able to successfully reveal the differences of the structural rearrangements within the asphalt mixtures for three different lift thicknesses. It also helped to explain some of the previous research studies results in a more comprehensive way. The achievements of this study may serve for developing an in-site evaluating test method for assessing compactability of asphalt mixtures before placing them on the roads.

  • 5.
    Partl, Manfred
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Introduction2018Inngår i: RILEM State-of-the-Art Reports, Springer Netherlands , 2018, s. 1-14Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An overview on the background and motivation for this report on the achievements of the technical committee RILEM TC 237-SIB on Testing and Characterization of Sustainable Innovative Bituminous Materials and Systems is presented, together with a short summary on the scope of this voluntary international team effort. Challenges and key research paths towards modern “green” asphalt pavements are addressed, focusing on general aspects associated with the increasing variety of approaches and their implication on testing and characterization of innovative asphalt pavement materials. As example for the complexity of the experimental challenges and the potential necessity to break free from traditional testing patterns, selected specific aspects of reinforced asphalt pavements are considered and discussed. It is emphasized that testing must be consistent with the purpose of the reinforcement, answering the key questions in what respect, under what conditions and in what loading direction reinforcement should be achieved and tested. This “garbage-in-garbage-out” awareness is also valid for all other fields dealing with testing and characterization of innovative bituminous materials and systems, of course. 

  • 6.
    Ansell, Anders
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Betongbyggnad.
    Nordström, Erik
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Betongbyggnad. Sweco Energuide, Hydro Power & Dams, Stockholm, Sweden.
    Guarin, Alvaro
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Laboratory investigation of steel fibre reinforced sprayed concrete using a computed tomography method2018Inngår i: Eight International Symposium on SPRAYED CONCRETE - Modern Use of Wet Mix Sprayed Concrete for Underground Support, 2018, s. 24-38Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A laboratory method for investigation of cored samples of steel fibre reinforced sprayed concrete (shotcrete) is described. A pilot study on computed tomography (CT) has been conducted, with focus on how the technique can be used for non-destructive testing where the cores remain intact after scanning and evaluation. The CT method require advanced integrated equipment for X-ray scanning and image detection, together with a computerized visualization system that can reproduce a threedimensional virtual, transparent model of the studied object. The method is well suited to describe orientation and distribution of steel fibres within the concrete. Interfaces between rock-concrete and concrete-concrete, between layers of differentsequences ofspraying, can also be identified. The results from the CT investigations can be presented as qualitative data that in 3D shows locations of steel fibres, aggregates, etc., and also as quantitative data showing relative distributions of cement paste, aggregates, steel fibres and voids, which is here demonstrated by a selection of examples. The method is well suited for practical analysis of sprayed concrete in situ specimens and it is recommended that it is established as a standard method for special inspections and performance evaluation of rock support in tunnels and subspace structures.

  • 7.
    Vieira, Tiago
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. VTI.
    Sandberg, Ulf
    VTI.
    Negative Texture, Positive for the Environment: Results of Horizontal Grinding of Asphalt Pavements2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A pavement surface having its texture deflections mostly directed downwards is said to have a “negative texture” and is expected to result in positive tire/road noise and rolling resistance properties. Negative textures are typical of porous asphalt pavements, but another way to achieve this is to grind-off the top of the asperities of a rough-textured surface. This paper explores the application of grinding pavement texture by tools operating in the horizontal plane (not to be confused with common “diamond grinding” which is made by tools operating in the vertical plane) on a number of asphalt pavements in Sweden, including porous asphalt and stone matrix asphalt. Noise measurements with the Close Proximity method were carried out to evaluate the different acoustical performance of the ground and the original surfaces. In most cases, also tire/road rolling resistance was measured. Texture and wet friction measurements were carried out to characterize how the grinding operation changed the surface texture. It was demonstrated that the grinding treatment led to a more negatively skewed surface texture, resulting in an A-weighted noise reduction up to 3 dB, while rolling resistance coefficients were reduced by up to 15 %. It is concluded that horizontal grinding indeed creates more “negative textures”, which results in improved noise and rolling resistance properties without sacrificing friction, though with limited longevity.

  • 8.
    Vieira, Tiago
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. VTI.
    Sandberg, Ulf
    VTI.
    Acoustical performance of winter tyres on two in-service road surfaces: a frequency spectrum analysis and comparison2017Inngår i: Proceedings of the Inter-Noise 2017, Hong Kong, 2017, s. 6825-6836Konferansepaper (Fagfellevurdert)
  • 9.
    Ansell, Anders
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Betongbyggnad.
    Ahmed, Lamis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Betongbyggnad.
    Guarin, Alvaro
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Computed tomography as investigation method for steel fibre reinforced tunnel shotcrete2017Konferansepaper (Fagfellevurdert)
  • 10. Toller, S.
    et al.
    Larsson, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Implementation of life cycle thinking in planning and procurement at the swedish transport administration2017Inngår i: Pavement Life-Cycle Assessment - Proceedings of the Pavement Life-cycle Assessment Symposium, 2017, CRC Press/Balkema , 2017, s. 281-287Konferansepaper (Fagfellevurdert)
    Abstract [en]

    According to transport policy objectives, limiting the energy use and climate impact of the transport system, including infrastructure, is an important task for the Swedish Transport Administration (STA). Choices that affect climate performance of transport infrastructure are made at different stages in the planning process. The STA has developed the Klimatkalkyl climate calculation model for an efficient, consistent life cycle calculation of infrastructure greenhouse gas emissions and energy use. As a result of the model’s implementation in planning and procurement, a life cycle perspective is now being used on a regular basis for environmental procurement claims, decision support and monitoring purposes. 

  • 11.
    Bekele, Abiy
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Birgisson, Björn
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap. KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Vägtekniks laboratorium.
    Rydén, Nils
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Gudmarsson, Anders
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Slow dynamic diagnosis of asphalt concrete specimen to determine level of damage caused by static low temperature conditioning2017Inngår i: 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, American Institute of Physics (AIP), 2017, Vol. 1806, artikkel-id 080012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The phenomenon of slow dynamics has been observed in a variety of materials which are considered as relatively homogeneous that exhibit nonlinearity due to the presence of defects or cracks within them. Experimental realizations in previous work suggest that slow dynamics can be in response to acoustic drives with relatively larger amplitude as well as rapid change of temperature. Slow dynamics as a nonlinear elastic response of damaged materials is manifested as a sharp drop and then recovery of resonance frequency linearly with logarithmic time. In this work, slow dynamics recovery is intended to be used as a means of identifying and evaluating thermal damage on an asphalt concrete specimen. The experimental protocol for measuring slow dynamics is based on the technique of nonlinear resonance spectroscopy and is set up with non-contact excitation using a loud speaker and the data acquisition tool box of Matlab. Sweeps of frequency with low amplitude are applied in order to probe the specimen at its linear viscoelastic state. The drop and then recovery in fundamental axially symmetric resonance frequency is observed after the specimen is exposed to sudden temperature change. The investigation of the viscoelastic contribution to the change in resonance frequency and slow dynamics can help identify micro-damage in asphalt concrete samples.

  • 12.
    Lundberg, Joacim
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. VTI - Statens Väg- och Transportforskningsinstitut.
    Blomqvist, Göran
    VTI - Statens Väg- och Transportforskningsinstitut.
    Gustafsson, Mats
    VTI - Statens Väg- och Transportforskningsinstitut.
    Janhäll, Sara
    VTI - Statens Väg- och Transportforskningsinstitut.
    Texture influence on road dust load2017Inngår i: Proceedings of the 22nd International Transportation and Air Pollution Conferens, 2017Konferansepaper (Fagfellevurdert)
  • 13.
    Lillqvist, Kristiina
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rohumaa, Anti
    LaBoMab - Ecole Nationale Supérieure d'Arts et Métiers.
    Källbom, Susanna
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Department of Bioproducts and Biosystems, Aalto University.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    The influence of thermal modification on veneer bond strength2017Konferansepaper (Annet vitenskapelig)
  • 14.
    Falk, Andreas
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Function and design of innovative bio-based products for the building sector2016Inngår i: Structures and Architecture - Proceedings of the 3rd International Conference on Structures and Architecture, ICSA 2016, CRC Press/Balkema , 2016, s. 93-101Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper will present a study of preconditions for competitiveness in a resource saving society. Preconditions for material suppliers and industry versus requirements from legislation and consumers means a balance, which can be difficult to manage. The paper is aiming for an analysis of the preconditions for property modification, innovation and marketing of biobased materials and products, and the paper deals with strategies to release the architectural potential of bio-based construction. 

  • 15. Das, Prabir
    et al.
    Birgisson, Bjorn
    Jelagin, Denis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Importance of Thermal Contraction Coefficient in Low Temperature Cracking of Asphalt Concrete2016Inngår i: Proceedings of the Fifty-Ninth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba / [ed] Canadian Technical Asphalt Association, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A major distress mode in asphalt pavements is low temperature cracking, which results from the contraction and expansion of the asphalt pavement under extreme temperature changes. The potential for thermal cracking involves interplay between the environment, the road structure, and importantly the properties of the asphalt mixture. In the present study, the low temperature cracking performance of asphalt mixture has been investigated numerically and experimentally. A low temperature cracking model has been utilized, which was developed by integrating fracture energy threshold into an asphalt concrete thermal fracture model considering non-linear thermal contraction coefficients. Based on the asphalt concrete mixture viscoelastic properties, this enhanced model can predict thermally-induced stresses and fracture temperatures. It was observed that the thermal contraction coefficient in asphalt concrete is non-linear in the temperature range of interest for low temperature cracking. The implications of having non-linear thermal contraction coefficient were investigated numerically. From the analysis, it was found that this enhanced model can be utilized to evaluate the low temperature cracking performance of asphalt mixtures and rank them accordingly. Interestingly, non-linear thermal contraction coefficient gave much better prediction than the linear approach.

  • 16.
    Onifade, Ibrahim
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Birgisson, Björn
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE). Aston University, UK .
    Investigation of Energy-Based Crack Initiation Threshold from Meso-Scale Asphalt Concrete Response2016Inngår i: 8th RILEM International Conference on Mechanisms of Cracking and Debonding in Pavements, Springer Netherlands, 2016, s. 679-685Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The existence of a fundamental energy threshold for meso-scale crackinitiation is investigated using micromechanical modeling techniques. X-rayComputed Tomography (CT) is used to acquire the internal structure of an asphaltconcrete mixture while Digital Image Processing (DIP) techniques is used to segment and analyze the different phases present in the mixture. Finite Element (FE)modeling is used to simulate a tensile loading condition to establish a critical micromechanical criterion for meso-scale crack initiation. The meso-scale asphaltconcrete mixture is subjected to different loading rates to obtain the global strainenergy density at the instance when the critical micromechanical crack-initiationcriterion threshold is attained at different deformation rates. The result from thestudy shows that there exists a fundamental global strain energy density thresholdthat is invariant of the rate of loading at the instance of meso-scale crack initiation.The result of this study also shows the potential of the use of X-Ray computedtomography in understanding the cracking phenomenon in asphalt mixture.

  • 17.
    Yideti, Tatek
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap.
    Jelagin, Denis
    KTH, Skolan för teknikvetenskap (SCI), Hållfasthetslära (Inst.), Hållfasthetslära (Avd.). KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Birgisson, Björn
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap.
    Moisture Distribution Model to Predict Matric Suction in Unbound Granular Materials as a Function of Fines Content2016Inngår i: TRB 95th Annual Meeting Compendium of Papers, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The existence of water in the layers of unbound road aggregates significantly influences the performance of pavement structure. Thus, the ability to estimate volumetric water content and its capillary effect is very important. Several models have been suggested to link the matric suction of unbound materials to their water retention properties. In this paper, an analytical moisture distribution model is proposed by using packing theory-based framework for unbound granular materials. The framework was previously developed by the authors of this paper and identifies two basic components of unbound granular materials skeleton: primary structure (PS) - a range of interactive coarse grain sizes that forms the main load-carrying network in granular materials and secondary structure (SS) - a range of grain sizes smaller than the PS providing stability to the aggregate skeleton. In the new moisture model, water was considered to be stored as both menisci water between SS particles and water that fully filled in very small voids. In order to validate the model, predicted results are compared with measured matric suction of a granite material with different gradations. The results showed that the model is capable of predicting the experimentally measured matric suction values for a range of gradations.

  • 18.
    Sandberg, Ulf
    et al.
    VTI.
    Mioduszewski, Piotr
    Technical University of Gdansk.
    Ejsmont, Jerzy
    Technical University of Gdansk.
    Vieira, Tiago
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. VTI.
    Noise and Rolling Resistance Properties of Various Types of Winter Tyres Compared to Normal Car Tyres2016Inngår i: Proceedings of the Inter-Noise 2016, German Acoustical Society (DEGA) , 2016, s. 1737-1746Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To cope with winter weather conditions, potentially including snow and ice, it is common to use winter tyres, or "all-seasons" tyres assumed to be safe both in summer and winter. In some northern countries, winter tyres are mandatory. It is commonly assumed that winter tyres are noisier than normal tyres (here called summer tyres) and winter tyres equipped with studs are assumed to be extra noisy. This paper presents a study where noise and rolling resistance properties of tyres for winter conditions are compared to summer and all-season tyres. The winter tyres include types optimized for central European climate, tyres optimized for Nordic climate and tyres with studs. In total, approx. 50 car tyres have been tested. Noise properties have been measured with the CPX method and rolling resistance has been measured with a trailer method; all measurements made on two road surfaces; SMA 8 and DAC 16. Results indicate that winter tyres are not noisier than summer tyres; except for studded tyres. Despite high differences among individual tyres, rolling resistance is approximately similar among the main types; surprisingly including also studded tyres. An alarming result was that there was no correlation between measured values and values on the tyre labels.

  • 19. Ruponen, J.
    et al.
    Kimpimäki, S.
    Rohumaa, A.
    Laine, K.
    KTH.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, L.
    Hughes, M.
    Tensile-shear strength studies on self-bonded 2-ply birch veneer joint manufactured and tested by applying Automated Bonding Evaluation System (ABES) hot press2016Inngår i: WCTE 2016 - World Conference on Timber Engineering, Vienna University of Technology , 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An Automatic Bond Evaluation System (ABES) hot press was employed to manufacture a self-bonded joint between two veneers of rotary-cut birch (Betula pendula Roth). The hot-pressing conditions were 220 °C and 5.0 MPa, with press times ranging from 180 s to 600 s with 60 s intervals. Additionally, the log-soaking temperature (20 °C and 70 °C) and the veneer initial MC (6% and 11%) were varied to study the effect on the tensile-shear strength of the joints. For one set, the surface properties were altered by acetone extraction. The samples were tested at 11% MC. However, one set was partly duplicated and tested at 6% MC, to study how the testing conditions influenced the bond strength. The maximum average tensile-shear strength was 3.3 MPa, observed after 600 s hot pressing. The studies also included bond-line micromorphology analysis by applying SEM combined with a micromachining surface preparation technique based on UV excimer laser ablation. It was also indicated that longer hot-pressing times, lower veneer initial MC and a lower testing MC resulted in increased tensile-shear strength. Acetone extraction decreased the bond strength with increased standard deviation. Finally, the highest single and average strengths were observed for veneers from higher soaking temperature.

  • 20.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Laine, Kristiina
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Sedighi Moghaddam, Maziar
    SP Technical Research Institute of Sweden.
    Rohumaa, Anti
    Aalto University, Department of Forest Products Technology.
    Segerholm, Kristoffer
    SP Technical Research Institute of Sweden.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    The influence of log soaking temperature and thermal modification on the properties of birch veneers2016Inngår i: IRG Annual Meeting, IRG Documents , 2016Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    In veneer manufacture the logs are routinely soaked in heated water baths in order to soften the wood prior to peeling. The temperature of the water may vary greatly between batches; however, the influence of log soaking temperature on veneer properties has had little research attention. Uncontrolled moisture is known to cause problems in wood-based materials, while thermal modification offers a method to control the interaction between wood and water. Therefore it might be beneficial to utilise thermally modified veneers in plywood manufacture. Yet, thermal modification is expected to also change other wood properties which might influence the possibility to utilise thermally modified veneers for wood-based-panels. The purpose of this study was to investigate the influence of log soaking temperature (70 °C and 20 °C) and thermal modification (8h in steam conditions) on selected properties of birch veneers, which are relevant in plywood manufacture. The surface area and surface free energy was studied with inverse gas chromatography (IGC). The surface free energy was found to be slightly higher for the unmodified veneers, however, no major difference was found in the dispersive part of the surface free energy between the log soaking temperatures or between unmodified or thermally modified veneers. The wetting of the veneers was investigated with the Wilhelmy plate method utilising the multicycling technique. It was found that lower log soaking temperature produced veneers with more hydrophobic nature. Also, thermal modification increased the hydrophobicity of the veneers. The bond strength was measured with an automatic bond evaluation system (ABES) using phenol formaldehyde (PF) resin. In general, the lower log soaking temperature resulted in slightly higher bond strength (however, the result was statistically insignificant), while thermal modification slightly lowered the bond strength. Based on these initial results thermally modifying the veneers prior to plywood manufacture might be useful.In veneer manufacture the logs are routinely soaked in heated water baths in order to soften the wood prior to peeling. The temperature of the water may vary greatly between batches; however, the influence of log soaking temperature on veneer properties has had little research attention. Uncontrolled moisture is known to cause problems in wood-based materials, while thermal modification offers a method to control the interaction between wood and water. Therefore it might be beneficial to utilise thermally modified veneers in plywood manufacture. Yet, thermal modification is expected to also change other wood properties which might influence the possibility to utilise thermally modified veneers for wood-based-panels. The purpose of this study was to investigate the influence of log soaking temperature (70 °C and 20 °C) and thermal modification (8h in steam conditions) on selected properties of birch veneers, which are relevant in plywood manufacture. The surface area and surface free energy was studied with inverse gas chromatography (IGC). The surface free energy was found to be slightly higher for the unmodified veneers, however, no major difference was found in the dispersive part of the surface free energy between the log soaking temperatures or between unmodified or thermally modified veneers. The wetting of the veneers was investigated with the Wilhelmy plate method utilising the multicycling technique. It was found that lower log soaking temperature produced veneers with more hydrophobic nature. Also, thermal modification increased the hydrophobicity of the veneers. The bond strength was measured with an automatic bond evaluation system (ABES) using phenol formaldehyde (PF) resin. In general, the lower log soaking temperature resulted in slightly higher bond strength (however, the result was statistically insignificant), while thermal modification slightly lowered the bond strength. Based on these initial results thermally modifying the veneers prior to plywood manufacture might be useful.

  • 21.
    Laine, Kristiina
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. SP Tech Res Inst Sweden.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Department of Forest Products Technology, Aalto University.
    Hughes, Mark
    Department of Forest Products Technology, Aalto University.
    Rowell, Roger
    Department of Biological Systems Engineering, University of Wisconsin, Madison, WI USA.
    Acetylation and densification of wood2015Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The purpose of this study was to explore the possibility to surface densify acetylated solid wood. The aim of surface densification is to improve mechanical properties, such as hardness, at the very surface of wood where the property improvements are mostly needed (e.g. in flooring and decking). However, when subjected to moisture, surface densified wood may swell back almost to the original dimensions. Therefore, acetylated and non-acetylated wood was surface densified in order to investigate whether the dimensional stability of densified wood may be improved by pre-acetylation. Surface densification was performed by compressing the acetylated radiate pine samples between metal plates with only one side heated (150°C) in order to target the deformation to one surface only. The original thickness of the samples was 20 mm and the target thickness 18 mm which was controlled by metal stops. The recovery of the deformation (set-recovery) was measured by soaking the samples in water and measuring the oven-dry thickness before and after soaking in repeated cycles. It was found that acetylated wood may be surface densified and indeed the set-recovery of the pre-acetylated wood was significantly lower (17.4 %) compared to non-acetylated wood (72.8 %). Further studies in adjusting the process parameters might lead to even higher reduction in set-recovery.

  • 22.
    Laine, Kristiina
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. SP Tech Res Inst Sweden.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Department of Forest Products Technology, Aalto University.
    Hughes, Mark
    Department of Forest Products Technology, Aalto University.
    Källbom, Susanna
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Jones, Dennis
    SP Tech Res Inst Sweden.
    Hardness, set-recovery and micromorphology studies of densified and thermally modified wood2015Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The purpose of the work reported in this paper was to increase the density of Scots pine wood in order to improve its hardness. Density was increased by compressing the porous structure of wood between heated metal plates in the radial direction by 40, 50 or 60% of the thickness. The compressed state was stabilised by thermally modifying (TM) the samples at 200 °C under steam conditions for 2, 4 or 6h. Set-recovery was almost eliminated (<1%) with TM of 6h for samples compressed 40 and 50%. It was discovered that hardness of densified wood was in some cases even three times higher compared to untreated wood. However, the hardness of the densified, non-TM wood was reduced after soaking and drying back to the original untreated level, while TM of 4 and 6h maintained an increased level of hardness.

  • 23.
    Linkosalmi, Lauri
    et al.
    Department of Forest Products Technology, Aalto University.
    Laine, Kristiina
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Department of Forest Products Technology, Aalto University.
    Life cycle impacts of modified wood products2015Konferansepaper (Annet vitenskapelig)
  • 24.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Aalto University, Department of Forest Products Technology.
    Johansson, Leena-Sisko
    Aalto University, Department of Forest Products Technology.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    SP Technical Research Institute of Sweden.
    Jones, Dennis
    SP Technical Research Institute of Sweden.
    Laine, Kristiina
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. Aalto University, Department of Forest Products Technology.
    Surface chemical analysis and water vapour sorpion of thermally modified wood exposed to increased relative humidity2015Inngår i: The Eighth European Conference on Wood Modification (ECWM8) 2015 / [ed] Mark Hughes, Lauri Rautkari, Tuuli Uimonen, Holger Militz and Brigitte Junge, 2015Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The increased interest in environmentally friendly building materials is accompanied with an increased need for research on thermally modified wood. Products made from recycling or reusing of thermally modified residuals will have advantages in terms of environmental aspects. Surface characteristics of thermally modified wood play an important role for the development of applications involving bonding processes, for example when using thermally modified wood residuals in biocomposites. Surface chemistry characteristics are important in developing such materials. A technique used for surface chemical analysis of the outermost surface is X‑ray photoelectron spectroscopy (XPS). Some surface chemical analyses of wood and modified wood can be found in Nzokou and Kamdem (2005), Inari et al. (2006), Bryne et al. (2010), Johansson et al. (2012), Rautkari et al. (2012). Furthermore, the influence of water and moisture has crucial effect on the properties of wood and wood products. Water vapour sorption properties of hygroscopic materials can be studied using a dynamic vapour sorption (DVS) instrument. Previous studies on thermally modified wood exposed to several sorption cycles using DVS have shown an increase in hysteresis during the first cycle, compared with unmodified wood (Hill et al., 2012). However, during the second and the third sorption cycle a reduction in sorption hysteresis was observed.

     

    The objective of this work was to study the surface chemical composition and water vapour sorption properties of thermally modified wood. In particular, an effort was made to study any influence on such properties due to a previous exposure to a high relative humidity (RH). Interpretations of the results indicate a decrease of extractable or volatile organic components and a relative increase of non-extractable components, for the high humidity-exposed samples. This could be due to remaining extractives migrating towards or redistribution at the wood surface layer as a result of moisture diffusion. The DVS results show that the thermally modified wood samples that had been exposed to the high relative humidity condition revealed a slight decrease of the hysteresis of the sorption isotherms. The opposite trend was furthermore seen for the unmodified wood.

  • 25.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Ormondroyd, Graham
    Biocomposites Centre, Bangor University, United Kingdom.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. SP Technical Research Institute of Sweden, Sweden.
    Jones, Dennis
    SP Technical Research Institute of Sweden, Sweden.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Surface energy characteristics of refined fibres at different pressures2014Inngår i: Proceedings of 10th Meeting of the Northern European Network for Wood Science & Engineering (WSE 2014) / [ed] Wilson, Peter, 2014, s. 134-138Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Wood fibres were produced on the pilot scale refiner at the BioComposites Centre, Bangor University, from a commercially sourced mix of chipped wood. The fibres were produced at refiner pressure 4, 6, 8 and 10 bar and dried in the associated flash drier. Surface energy characterization of the refined fibres was performed using inverse gas chromatography (IGC). The dispersive part of the total surface energy was analysed for duplicates of fibre samples at the four different refiner pressures. Non-polar alkane probes were used for the dispersive surface energy analysis at different surface coverage. Results indicate that the processing pressure has an effect of the dispersive surface energy and IGC analysis could be developed as a tool both for process development and process control in refining fibres.

  • 26.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. SP Technical Research Institute of Sweden.
    Jones, Dennis
    SP Technical Research Institute of Sweden.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Surface energy characterization of thermally modified wood particles exposed to humidity cycling using inverse gas chromatography2014Inngår i: / [ed] Nunes, L., Jones, D., Hill, C. and Militz, H., 2014Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The objective of this work was to study surface energetics of thermally modified wood particles exposed to dry-humid cycling. This information can give insight in the adhesion properties between the modified wood and composite matrices, adhesives or coatings. The surface energy characterization as well as the dry-humid cycling was performed using inverse gas chromatography (IGC). Duplicates of thermally modified and unmodified spruce particles with size 0-0.125 mm were investigated and conditioned in dry-humid cycles at 0-75 % RH and 0‑25 % RH. The BET specific surface area as well as the dispersive surface energy heterogeneity (or distribution) at different surface coverage was determined. The results showed similar trends for the different cycles in the dry and humid states, respectively. The difference in dispersive surface energy distribution between the dry and humid state was more pronounced at the lower surface coverage.

  • 27.
    Khavassefat, Parisa
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap.
    Jelagin, Denis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Birgisson, Bjorn
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Transportvetenskap.
    The effect of road surface deterioration on pavement service life2014Inngår i: Expanding horizons: 13th International Symposium on Heavy Vehicle Transport Technology, San Luis, Argentina, 27-31 October 2014, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The effect of pavement surface deterioration on pavement service life has been studied for a set of case studies. The Swedish mechanistic empirical design method is used in order to analyse the pavement performance under dynamic moving loads while the longitudinal profile unevenness is updated on yearly basis. The surface evolution assumed in the case scenarios are chosen in relevance with the general trend of surface deterioration in Swedish road network. Results from the case studies indicate that the pavement service life is highly affected by pavement surface deterioration, especially for pavement segments with high traffic. Moreover predictive maintenance for high traffic road segments might be beneficial as it increases pavement service life and decreases the user related costs, e.g. vehicle fuel consumption.

  • 28.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Rautkari, Lauri
    Wood Material Science and Technology, Department of Forest Products Technology, Aalto University.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Jones, Dennis
    SP Technical Research Institute of Sweden.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial. SP Technical Research Institute of Sweden.
    Water vapour sorption properties and surface chemical analysis of thermally modified wood particles2014Inngår i: Recent Advances in the field of TH and THM Wood Treatment, 2014Konferansepaper (Annet vitenskapelig)
  • 29.
    Falk, Andreas
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Cross-laminated timber: Driving forces and innovation2013Inngår i: Structures and Architecture: Concepts, Applications and Challenges - Proceedings of the 2nd International Conference on Structures and Architecture, ICSA 2013, CRC Press, 2013, s. 511-518Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The first modern applications of massive timber plate elements were seen in bridge decks in Canada and the US in the 1970's. Two decades later the concept was taken as point of departure for extensive research on primarily residential building construction and bridge decks in Central Europe in the early 1990's. Today the range of applications has been widened to include an increasing share of applications in non-residential buildings as well as in geometrically far more complex structures. Thereby the requirements on joint properties, stability and detailing etcetera - i.e. the problem issues - have changed, increasing the demands on innovation and solutions both in research and practice. Thus, issues to research and innovate developed applications and multi-objective approaches have succeeded first basic research efforts. This paper describes this development and defines current needs and proposes topics for further studies for the next generation of structural systems based on cross-laminated timber, CLT.

  • 30. Chailleux, E.
    et al.
    Partl, M. N.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    General summary and outlook2013Inngår i: RILEM State-of-the-Art Reports, Springer, 2013, s. 429-438Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Final considerations based on the experience and feedback of this RILEM technical committee TC 206-ATB on “Advanced Testing and Characterization of Bituminous Materials” are given. Some open questions within the general methodology as introduced in Chap. 1 and used as guideline for RILEM activities are listed. Future prospects and direction of activities of joint voluntary research efforts within the frame of such asphalt-related committees are also discussed. It is suggested that these future efforts will most certainly have to focus even more on sustainability and environmental aspects but without neglecting general materials and systems quality aspects during production and construction as well as safety and performance during use. Future activities will also have to dealwith multifunctionality aspects of pavements and multi-scaling approaches as a basis for better understanding and tailoring of pavements and pavement materials.

  • 31.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Ibach, Rebecca E
    Moisture and Fungal Durability of Wood-Plastic Composites Made With Chemically Modified and Treated Wood Flour2013Inngår i: Proceedings IRG Annual Meeting, 2013, s. IRG/WP 13-40648-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Evaluating the fungal durability of wood-plastic composites (WPCs) is complicated by the influence of slow moisture sorption. Recently, the American Wood Protection Association (AWPA) Standard Method E10, Testing Wood Preservatives by Laboratory Soil-Block Cultures, was modified to incorporate not only solid wood, but also wood-based composites and WPCs. To simulate long term WPC performance, conditioning of the specimens is now required prior to fungal exposure to increase the moisture content of the specimens. The moisture and fungal durability, as well as the mechanical properties, of two different WPCs were investigated in the laboratory following this new AWPA E10-12 Standard. Wood flour was modified with acetic anhydride and then extruded with high density polyethylene (HDPE). Wood flour was treated with an isothiazolone-based solution and then injected molded with polypropylene (PP). WPCs were conditioned by water soaking either 2 weeks at 22 ˚C or 5 days at 70 ˚C. Weight and moisture content of the WPCs were monitored. Results showed that the acetylation decreased the moisture sorption of the WPCs and showed no mass losses due to decay. The WPC with an isothiazolone-based solution did not show any mass losses due to fungal decay.

  • 32.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Jones, Dennis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Physico-chemical characterization of THM modified wood using inverse gas chromatography (IGC)2013Inngår i: Evaluation, processing and prediction of THM treated wood behaviour by experimental and numerical methods, 2013, s. 35-36Konferansepaper (Annet vitenskapelig)
  • 33.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Jones, Dennis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Surface energy characterization at different moisture levels of thermally modified wood using inverse gas chromatography2013Inngår i: Proceedings of the 9th meeting of the Northern European Network for Wood Science and Engineering (WSE) / [ed] Briscke, C. & Meyer, L., 2013, s. 130-135Konferansepaper (Annet vitenskapelig)
  • 34.
    Källbom, Susanna
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Jones, Dennis
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Surface energy characterization of thermally modified wood using inverse gas chromatography2013Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The objective of this work is to characterize surface energetics of thermally modified wood. Such information may be useful for a better understanding and predictions of adhesion properties between the modified wood and other material systems, e.g. coatings, adhesives or matrices in composites. Inverse gas chromatography (IGC) was used to study the surface energy characteristics of thermally modified spruce in particle form. Two different wood component samples were prepared, one with a larger and one with a smaller particle size distribution. Measurements of BET specific surface area and dispersive surface energy distribution of the particle samples are presented. Results indicate that a ground wood component of a finer size distribution of thermally modified wood is less energetically heterogeneous compared with a component with a larger size distribution.

  • 35.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Larsson Brelid, Pia
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Westin, Mats
    Frisk, Olof
    Biological outdoor durability of WPC with chemically modified wood2012Inngår i: Proceedings of the 6th European conference on wood modification / [ed] Jones, D., Militz, H., Petrič, M., Pohleven, F., Humar, M. and Pavlič, M., 2012, s. 47-54Konferansepaper (Fagfellevurdert)
  • 36. Jones, Dennis
    et al.
    Englund, Finn
    Henriksson, Marielle
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Trey, Stacy
    KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.
    Ziethen, Rune
    Gonzales, Sergio
    Segui, Luis
    Development of a novel wood based panel for use in internal door manufacture2012Inngår i: Proceedings of the 5th International Conference on Environmentally-Compatible Forest Products, 2012Konferansepaper (Fagfellevurdert)
  • 37.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Inverse gas chromatography characterization of wood composite components2012Inngår i: Proceedings of the 8th meeting of the Northern European Network for Wood Science and Engineering (WSE) / [ed] Baltrušatits, A. and Ukvalbergienė, K., 2012, s. 58-63Konferansepaper (Fagfellevurdert)
  • 38.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Ibach, Rebecca E.
    Westin, Mats
    Durability of PLA - Modified Wood Composites2011Inngår i: Proceedings of the 11th International Conference on Wood & Biofiber Plastic Composites, 2011Konferansepaper (Fagfellevurdert)
  • 39. Jermer, Jöran
    et al.
    Wong, Andrew H.H.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Nilsson, Thomas
    Durability testing of coconut shell according to ENV 8072011Konferansepaper (Fagfellevurdert)
  • 40.
    Sidorova, Ekaterina
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Trey, Stacy
    SP Sveriges Tekniska Forskningsinstitut.
    Englund, Finn
    SP Sveriges Tekniska Forskningsinstitut.
    Modification of wood with an anti-oxidant tannin derivative: preliminary study2011Inngår i: Proceedings of the 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE) 2011, 2011, s. 161-166Konferansepaper (Fagfellevurdert)
  • 41.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Bardage, Stig L.
    Mould growth resistance of fungicide-containing WPC2011Inngår i: Proceedings of the 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE), 2011, s. 25-30Konferansepaper (Fagfellevurdert)
  • 42.
    Wålinder, Magnus
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Gardner, D.J.
    Surface energy characteristics of maple wood particles coated with polystyrene-acrylic acid (PSAA) block copolymer2011Inngår i: Proceedings of the 2011 IAWS Annual Meeting on Novel Materials from Wood or Cellulose, Stockholm: Innventia , 2011, s. 66-67Konferansepaper (Fagfellevurdert)
  • 43. Olsson, Sara
    et al.
    Östmark, Emma
    KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik.
    Ibach, Rebecca E.
    Clemons, Craig M.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Englund, Finn
    The use of esterified lignin for synthesis of durable composites2011Inngår i: Proceedings of the 7th meeting of the Nordic-Baltic Network in Wood Material Science and Engineering (WSE), 2011, s. 173-178Konferansepaper (Fagfellevurdert)
  • 44.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Holmberg, Daniel
    Adhesion studies of scots pine-polypropylene bond using ABES2010Inngår i: In Proceedings of the 6th meeting of the Nordic-Baltic Network in Wood Material Science and Engineering, WSE, 2010Konferansepaper (Fagfellevurdert)
  • 45.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Dimensional changes due to water sorption in high wood-content WPCs prepared with modified wood2010Inngår i: In Proceedings of the fifth European Conference on Wood Modification, ECWM5, 2010Konferansepaper (Fagfellevurdert)
  • 46.
    Wålinder, Magnus
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Westin, Mats
    Durability of high wood content WPCs2010Inngår i: Proceedings of the International Convention of Society of Wood Science and Technology andUnited Nations Economic Commission for Europe – Timber Committee, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One increasing market segment of building materials is so-called biocomposites, or wood-thermoplastic composites (WPCs). Chiefly, these products are partly made from renewable resources such as wood residuals or agro fibres, functioning as reinforcement, and partly from recyclable thermoplastics or biopolymers, functioning as matrix. In general, WPC products are marketed as a low maintenance building material with a high outdoor durability. The intrinsic high moisture sensitivity of the wood component in combination with a low compatibility between the hydrophilic wood and hydrophobic thermoplastic may, however, result in poor long-term performance and outdoor durability. The objective of this paper is to recapitulate some of our research group’s observations and experience during recent years with respect to both field and laboratory tests related to the durability of WPCs. Of particular interest is one type of extruded WPCs with a comparable high wood content, i.e. ca 70 weight-%, prepared with either a heat treated, acetylated, or unmodified wood component. Observations from outdoor field trials, laboratory fungal decay tests, moisture sorption properties and effects on micromorphology, show that the use of a modified wood component in these WPCs considerably increases their long-term outdoor durability. One reason for this is related to the reduction of the moisture sensitivity of the wood component. Such durable biocomposite-type of building materials with a high wood-content level have the potential to fulfill the criteria for being eco-efficient, that is being both a sustainable and a cost-efficient “green” material.

  • 47.
    Wålinder, Magnus
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Segerholm, Kristoffer
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Larsson Brelid, Pia
    Westin, Mats
    Liquids and coatings wettability and penetrability of acetylated scots pine sapwood2010Inngår i: In Proceedings of the fifth European Conference on Wood Modification, ECWM5, 2010, s. 381-388Konferansepaper (Fagfellevurdert)
  • 48.
    Sidorova, Ekaterina
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Morén, Tom
    Luleå tekniska universitet.
    The Behaviour of Heat Treated Wooden Cladding Exposed to Extreme Climate Changes2010Inngår i: Proceedings of the 6th meeting of the Nordic-Baltic Network In Wood Material Science And Engineering (WSE) / [ed] Pille Meier, 2010, s. 147-154Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The heat treated (HT) ThermoD and oil heat treated (OHT) samples were prepared for the test. ThermoD samples were prepared by treating wood with superheated steam and saturated steam. Oil heat treated samples were heat treated in oil under 180ºC and cooled directly in clean oil at the room temperature. During cooling the samples absorbed some oil. Untreated samples of pine, spruce and aspen were prepared as the reference samples.The material was tested for 5 cycles. Each cycle contained: soaking in water for 24 hours, direct freezing for 6 days and direct warming for 30 minutes. The tested species were pine, spruce and aspen. Water absorption depended on type of species and treatment. Pine had higher water absorption but after oil heat treatment had the lowest water absorption due to high oil contain. Spruce and aspen had approximately the same water absorption. Heat treatment reduced water absorption as it was expected. Samples degraded in colour more or less and some started to crack. Almost all untreated and ThermoD treated pine samples cracked. Spruce had the highest visible change of the colour after the test. Aspen showed the best results because the colour did not change significantly and the material did not crack. Oil heat treated samples of pine lost some oil after the test

  • 49.
    Segerholm, Kristoffer
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Omidvar, Asghar
    Wålinder, Magnus
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    Acetylation to Minimize Water Uptake and Deformation of High Wood Content WPC2009Inngår i: The Fourth European Conference on Wood Modification, 2009, s. 239-242Konferansepaper (Fagfellevurdert)
  • 50.
    Wålinder, M. E. P.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
    EcoBuild – centrum för eko-effektiva träbaserade material och produkter. Samverkan mellan SP, 36 företag och universitet2009Konferansepaper (Annet (populærvitenskap, debatt, mm))
12 1 - 50 of 72
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