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Elaguine, Denis, DocentORCID iD iconorcid.org/0000-0002-0596-228X
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Publications (10 of 43) Show all publications
Olsson, E. & Jelagin, D. (2019). A contact model for the normal force between viscoelastic particles in discrete element simulations. Powder Technology, 342, 985-991
Open this publication in new window or tab >>A contact model for the normal force between viscoelastic particles in discrete element simulations
2019 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 342, p. 985-991Article in journal (Refereed) Published
Abstract [en]

DEM modeling of granular materials composed of viscoelastic particles can provide valuable insights into the mechanical behavior of a wide range of engineering materials. In this paper, a new model for calculating the normal contact force between visoelastic spheres is presented based on contact mechanics that takes the mechanical behavior of the DEM particles into account. The model relies on an application of the viscoelastic correspondence principle to elastic Hertz contact. A viscoelastic relaxation function for the contact is defined and a generalized Maxwell material is used for describing this function. An analytical expression for the increment in contact force given an increment in overlap is derived leading to a computationally efficient model. The proposed model provides the analytical small deformation solution upon loading but provides an approximate solution at unloading. Comparisons are made with FEM simulations of contact between spheres of different sizes of equal and dissimilar materials. An excellent agreement is found between the model and the FEM simulations for almost all cases except at cyclic loading where the characteristic times of the viscoelastic behavior and the loading are similar.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Discrete element method, Viscoelastic contact, Contact mechanics, Contact law, Finite elements
National Category
Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-241184 (URN)10.1016/j.powtec.2018.10.022 (DOI)000454375100097 ()2-s2.0-85056464283 (Scopus ID)
Note

QC 20190121

Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-06-10Bibliographically approved
Ghafoori Roozbahany, E., Partl, M. & Elaguine, D. (2019). Modelling the flow of asphalt under simulated compaction using discrete element. Construction and Building Materials, 227, Article ID 116432.
Open this publication in new window or tab >>Modelling the flow of asphalt under simulated compaction using discrete element
2019 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 227, article id 116432Article in journal (Refereed) Published
Abstract [en]

The flow differences between the particles of asphalt mixtures compacted in the laboratory and in the field have been identified as one of the reasons for the discrepancies between laboratory and field results. In previous studies, the authors developed a simplified test method, the so-called compaction flow test (CFT), for roughly simulating the flow of particles in asphalt mixtures under compacting loads in laboratory. The CFT was used in different studies to examine its capability of revealing the differences between the flow behavior of different asphalt mixtures under various loading modes. The promising results encouraged further development of the CFT by investigating the possible impacts of simplifications and boundary conditions on the results of this test. For this reason, discrete element method (DEM) was utilized to investigate possible impacts of the mold size, geometry of the loading strip as well as the loading rate on the results of the CFT. The results of the simulation indicate that in case of wearing course layers with nominal maximum aggregate size of 11 mm, the length of the CFT mold can be increased from 150 mm to 200–250 mm for reducing flow disturbances from the mold walls. However, since the majority of the flow of asphalt mixture particles is expected to take place within the first 100–150 mm length of the mold, reasonable results can still be obtained even without changing the size of the CFT mold. Moreover, comparing results with different loading strip geometries and loading rates indicates that the current CFT setup still appears to provide consistent results.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Asphalt compaction, Boundaries, Compaction flow test, Discrete element, Compaction, Finite difference method, Mixtures, Molds, Semiconductor insulator boundaries, Testing, Flow behaviors, Flow disturbances, Flow of particles, Flow tests, Loading strips, Maximum aggregate sizes, Simplified test, Wearing course, Asphalt mixtures
National Category
Building Technologies Other Materials Engineering
Research subject
Materials Science and Engineering; Civil and Architectural Engineering, Building Materials
Identifiers
urn:nbn:se:kth:diva-263465 (URN)10.1016/j.conbuildmat.2019.07.158 (DOI)000496830500013 ()2-s2.0-85070383471 (Scopus ID)
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-12Bibliographically approved
Tebaldi, G., Apeagyei, A., Elaguine, D. & Falchetto, A. C. (2018). Advanced measurement systems for crack characterization. In: Mechanisms of Cracking and Debonding in Asphalt and Composite Pavements: (pp. 155-227). Springer
Open this publication in new window or tab >>Advanced measurement systems for crack characterization
2018 (English)In: Mechanisms of Cracking and Debonding in Asphalt and Composite Pavements, Springer, 2018, p. 155-227Chapter in book (Refereed)
Abstract [en]

The previous chapters describe numerical models and testing methods designed to simulate, to repeat and to understand the cracking phenomena in asphalt materials and asphalt pavement (or pavements with at least one asphalt layer). This chapter shows some of the most advanced systems to measure the parameters related to cracking. They are classified using a classification grid that considers the most relevant characteristics of the measurement system. The proposed classification method was designed to provide a quick understanding of what data the systems are able to provide and what they can analyze.

Place, publisher, year, edition, pages
Springer, 2018
Series
RILEM State-of-the-Art Reports, ISSN 2213-204X, E-ISSN 2213-2031
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-236384 (URN)10.1007/978-3-319-76849-6_4 (DOI)2-s2.0-85047668112 (Scopus ID)978-3-319-76848-9 (ISBN)978-3-319-76849-6 (ISBN)
Note

QC 20181105

Available from: 2018-11-05 Created: 2018-11-05 Last updated: 2018-11-05Bibliographically approved
Jelagin, D., AHMED, A., Lu, X. & Said, S. F. (2018). Asphalt layer rutting performance prediction tools. Linkoping: VTI, Statens väg och transportforskningsinstitut
Open this publication in new window or tab >>Asphalt layer rutting performance prediction tools
2018 (English)Report (Other academic)
Abstract [en]

Flexible pavement rutting due to permanent deformation accumulation in asphalt layers is one of the most common modes of road failures. In addition to creating high maintenance costs, rutting is a major concern for traffic safety, as the rut development increases the risk of hydroplaning and introduce difficulties in vehicle steering. In this context, accurate methodologies for pavement rutting performance prediction are crucial for decision support in pavement design and rehabilitation. In particular, better rutting performance models are needed to evaluate, new asphalt materials as well as to evaluate the impact of different vehicle types on roads’ service life.The main goal of this report is to present a summary of the existing asphalt rutting performance prediction tools. The present review is limited to available and/or frequently referred to tests and models with an established link to field rutting performance. Accordingly, models focusing solely on permanent deformation on the material level are beyond the framework of the present study.Road structure and its materials, heavy vehicle parameters and climate affecting rutting accumulation in the field are identified. Their significance has been evaluated based on the experimental and numerical findings reported in the literature. Several rutting performance prediction models recently proposed in the literature are summarized along with the material characterization tests used in the models. The reviewed models’ capability to quantify the influence of various structural, material and traffic parameters on the pavement’s rutting performance is examined. It is concluded that implementation of rutting performance models incorporating experimentally measured viscoelastic and permanent deformation properties of asphalt mixtures is a promising way to improve the accuracy of pavement performance predictions. In particular since they allow the effect of novel materials, e.g. polymer-modified, on the pavement’s rutting performance to be quantified.

Place, publisher, year, edition, pages
Linkoping: VTI, Statens väg och transportforskningsinstitut, 2018
Series
VTI rapport, ISSN 0347-6030 ; 968A
Keywords
Rutting; flexible pavements; modelling; viscoelasticity
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-248646 (URN)
Note

QC 20190513

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-08-30Bibliographically approved
Hu, C., Ma, J., Zhao, J., Leng, Z. & Jelagin, D. (2017). Experimental Study of Dowel Bar Alternatives Based on Similarity Model Test. Advances in Materials Science and Engineering, Article ID 3981908.
Open this publication in new window or tab >>Experimental Study of Dowel Bar Alternatives Based on Similarity Model Test
Show others...
2017 (English)In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, article id 3981908Article in journal (Refereed) Published
Abstract [en]

In this study, a small-scaled accelerated loading test based on similarity theory and Accelerated Pavement Analyzer was developed to evaluate dowel bars with different materials and cross-sections. Jointed concrete specimen consisting of one dowel was designed as scaled model for the test, and each specimen was subjected to 864 thousand loading cycles. Deflections between jointed slabs were measured with dial indicators, and strains of the dowel bars were monitored with strain gauges. The load transfer efficiency, differential deflection, and dowel-concrete bearing stress for each case were calculated from these measurements. The test results indicated that the effect of the dowel modulus on load transfer efficiency can be characterized based on the similarity model test developed in the study. Moreover, round steel dowel was found to have similar performance to larger FRP dowel, and elliptical dowel can be preferentially considered in practice.

Place, publisher, year, edition, pages
HINDAWI LTD, 2017
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-204115 (URN)10.1155/2017/3981908 (DOI)000395136200001 ()2-s2.0-85014471463 (Scopus ID)
Note

QC 20170328

Available from: 2017-03-28 Created: 2017-03-28 Last updated: 2017-11-29Bibliographically approved
de Frias Lopez, R., Silfwerbrand, J., Jelagin, D. & Birgisson, B. (2016). Force transmission and soil fabric of binary granular mixtures. Geotechnique, 66(7), 578-583
Open this publication in new window or tab >>Force transmission and soil fabric of binary granular mixtures
2016 (English)In: Geotechnique, ISSN 0016-8505, E-ISSN 1751-7656, Vol. 66, no 7, p. 578-583Article in journal (Refereed) Published
Abstract [en]

The effect of fines content on force transmission and fabric development of gap-graded mixtures under triaxial compression has been studied using the discrete-element method. Results were used to define load-bearing soil fabrics where the relative contributions of coarse and fine components are explicitly quantified in terms of force transmission. Comparison with previous findings suggests that lower particle size ratios result in higher interaction between components. A potential for instability was detected for underfilled fabrics in agreement with recent findings. It was also found that the threshold fines content provides an accurate macroscopic estimation of the transition between underfilled and overfilled fabrics.

Place, publisher, year, edition, pages
ICE Publishing, 2016
Keywords
discrete-element modelling, fabric/structure of soils, particle-scale behaviour
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-185171 (URN)10.1680/jgeot.14.P.199 (DOI)000377361700005 ()
Note

QC 20160721

Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2017-11-30Bibliographically approved
Das, P., Birgisson, B. & Jelagin, D. (2016). Importance of Thermal Contraction Coefficient in Low Temperature Cracking of Asphalt Concrete. In: Canadian Technical Asphalt Association (Ed.), Proceedings of the Fifty-Ninth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba: . Paper presented at Fifty-Ninth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba.
Open this publication in new window or tab >>Importance of Thermal Contraction Coefficient in Low Temperature Cracking of Asphalt Concrete
2016 (English)In: Proceedings of the Fifty-Ninth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba / [ed] Canadian Technical Asphalt Association, 2016Conference paper, Published paper (Refereed)
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.

Keywords
Bituminous mixtures; Conferences; Cracking; Flexible pavements; Freeze thaw durability; Frost damage
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-248697 (URN)
Conference
Fifty-Ninth Annual Conference of the Canadian Technical Asphalt Association (CTAA): Winnipeg, Manitoba
Note

QC 20190513

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-05-13Bibliographically approved
Yideti, T., Jelagin, D. & Birgisson, B. (2016). Moisture Distribution Model to Predict Matric Suction in Unbound Granular Materials as a Function of Fines Content. In: TRB 95th Annual Meeting Compendium of Papers: . Paper presented at Transportation Research Board 95th Annual Meeting, Washington DC, United States.
Open this publication in new window or tab >>Moisture Distribution Model to Predict Matric Suction in Unbound Granular Materials as a Function of Fines Content
2016 (English)In: TRB 95th Annual Meeting Compendium of Papers, 2016Conference paper, Published paper (Refereed)
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.

Keywords
Aggregate gradation; Fines (Materials); Granular materials; Mathematical models; Moisture content; Validation
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-248687 (URN)
Conference
Transportation Research Board 95th Annual Meeting, Washington DC, United States
Note

This paper was sponsored by TRB committee AFP60 Standing Committee on Engineering Behavior of Unsaturated Soils.

QC 20190522

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-05-22Bibliographically approved
Khavassefat, P., Jelagin, D. & Birgisson, B. (2016). Non-stationary Response of Flexible pavements to Moving Vehicles. The international journal of pavement engineering, 17(5), 458-470
Open this publication in new window or tab >>Non-stationary Response of Flexible pavements to Moving Vehicles
2016 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 17, no 5, p. 458-470Article in journal (Refereed) Published
Abstract [en]

In this paper the pavement surface deterioration is investigated based on field measurements of surface roughness profiles obtained in Sweden. A predictive function for surface deterioration, based on average gradient of yearly measurements of the road surface profile in Swedish road network, is proposed. In order to characterise the dynamic loads induced on the pavement by moving traffic a quarter car model is used. Afterwards a non-stationary stochastic approach is used to obtain the yearly response of the pavement to moving loads. The solution is in frequency-wavenumber domain and is given for a non-stationary random case as the pavement surface deteriorates in pavement service life influencing thus the magnitude of the dynamic loads induced by the vehicles. The effect of pavement surface evolution on the stress state induced in the pavement by moving traffic is examined for a specific case of quarter car model and pavement structure. The results showed approximately a 100% increase in the dynamic component of stresses induced in the pavement.

Place, publisher, year, edition, pages
Taylor & Francis, 2016
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-156041 (URN)10.1080/10298436.2014.993394 (DOI)000371595500009 ()
Note

Updated from Accepted to Published. QC 20160401

Available from: 2014-11-18 Created: 2014-11-18 Last updated: 2017-12-05Bibliographically approved
Lira, B., Jelagin, D. & Birgisson, B. (2015). Binder distribution model for asphalt mixtures based on packing of the primary structure. The international journal of pavement engineering, 16(2), 144-156
Open this publication in new window or tab >>Binder distribution model for asphalt mixtures based on packing of the primary structure
2015 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 16, no 2, p. 144-156Article in journal (Refereed) Published
Abstract [en]

Film thickness describes the coating around aggregate particles on asphalt mixtures. The standard method of calculating film thickness has proven to present several limitations, such as assuming an average thickness independent of particle size, being completely independent to the porosity of the mixture and considering only one mineral type. In this paper, a binder distribution model is developed for aggregates according to size and role in the structure. The aggregates are separated into two different structures: primary structure, the load bearing one, and secondary structure, smaller material that provides stability to the skeleton. A coating thickness for these two structures is calculated from a geometrical consideration that includes the packing arrangement of particles and the effect of overlapping as the film grows. The results were compared with known rutting performance of field mixtures and moisture conditioned laboratory mixtures, showing a good correlation between film thickness and resistance to failure.

Keywords
Asphalt mixture, Binder distribution, Film thickness, Primary Structure, Rutting, Moisture damage
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-98423 (URN)10.1080/10298436.2014.937713 (DOI)000343298300004 ()2-s2.0-84908161232 (Scopus ID)
Note

QC 20141113

Available from: 2012-06-26 Created: 2012-06-26 Last updated: 2017-12-07Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-0596-228X

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