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Publications (10 of 14) Show all publications
Chen, F., Jelagin, D. & Partl, M. (2019). Experimental and numerical analysis of asphalt flow in a slump test. International Journal on Road Materials and Pavement Design, 20, S446-S461
Open this publication in new window or tab >>Experimental and numerical analysis of asphalt flow in a slump test
2019 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 20, p. S446-S461Article in journal (Refereed) Published
Abstract [en]

The mechanical behaviour of uncompacted asphalt mixtures is still not well understood,threatening directly to the pavement practices such as control of mixture’s workability andsegregation. This situation may become even worse due to the gradually increasing complexityand advances in paving materials and technologies. This study adopts a slump flow testbased on concrete technology and a Discrete Element (DE)-based numerical tool to investigatethe mechanical behaviour of uncompacted asphalt mixture from a microstructural point ofview, particularly focusing on the bituminous binder effects. The combined experimental andnumerical analysis indicates that bitumen distinctly influences the contact interactions withinthe mixture and thus its macroscopic flow, which can be physically interpreted as a combinedeffect of lubricated friction and bonding force. Additional case studies demonstrate that the DEmodel is capable of simulating the flow response of asphalt mixtures under changed particlecontact conditions and driven force.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Asphalt mixture; slump test; discrete element method; large displacement
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-246052 (URN)10.1080/14680629.2019.1587495 (DOI)000468539800028 ()2-s2.0-85062715193 (Scopus ID)
Funder
Swedish Research Council Formas, 2012-1349
Note

QC 20190319

Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-06-24Bibliographically approved
Balieu, R., Chen, F. & Kringos, N. (2019). Life Cycle Sustainability Assessment of Electrified Road Systems. International Journal on Road Materials and Pavement Design
Open this publication in new window or tab >>Life Cycle Sustainability Assessment of Electrified Road Systems
2019 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402Article in journal (Refereed) Epub ahead of print
Abstract [en]

The widespread use of Electric Vehicles (EVs) has been one of the main directionsfor pursuing a sustainable future of road transport in which, the deployment ofthe associated charging infrastructures, static or dynamic, has been included as oneof the main cornerstones for its success. Different electrified road (eRoad) systemswhich allow for dynamic charging of EVs by transferring electrical power from theroad to the vehicle in-motion, either in a conductive or contactless way, are underactive investigation. One of the important tasks in feasibility analysis of suchinfrastructure is to quantitatively assess its environmental performance and, thus,the consequential influences to the sustainability of road electrification as a whole.Having this concern in mind, in this study, a systematic LCA study is carried out in which the environmental impacts from the different life cycle stages have beencalculated and compared among several promising eRoad systems. In a next step,suitable strategies can be accordingly made to minimize these impacts in a most effectiveway; and more importantly, the LCA results of this study can serve as one ofthe important bases for conducting a more comprehensive and objective evaluationof the potential environmental benefits EVs could bring.

Place, publisher, year, edition, pages
Abingdon, UK: Taylor & Francis, 2019
Keywords
Electrified Road System, Dynamic charging, Life Cycle Assessment
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-246053 (URN)10.1080/14680629.2019.1588771 (DOI)000461976800001 ()2-s2.0-85063072590 (Scopus ID)
Funder
Swedish Energy Agency, 41405-1
Note

QCR 20190318

Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-08-27Bibliographically approved
Sun, G., Sun, D., Guarin, A., Ma, J., Chen, F. & Ghafooriroozbahany, E. (2019). Low temperature self-healing character of asphalt mixtures under different fatigue damage degrees. Construction and Building Materials, 223, 870-882
Open this publication in new window or tab >>Low temperature self-healing character of asphalt mixtures under different fatigue damage degrees
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2019 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 223, p. 870-882Article in journal (Refereed) Published
Abstract [en]

The primary objective of this study is to advance the understanding of the low temperature self-healing character of asphalt mixtures under different damage degrees, thus to determine the effective strategy of asphalt pavement maintenance. Firstly, three kinds of asphalt mixtures are selected to conduct the indirect tensile (IDT) fatigue test to a certain fatigue damage degree at low temperatures, and then the resilient modulus (Mr) at different rest time is measured to quantify the healing potential. Next, the fatigue loading with different intermittent time (0 s, 1 s and 3 s) is applied to determine the impact of intermittent time on healing potential. The results indicate that the descending order of healing potential of asphalt mixtures is: SMA-11 > AC-8 > AC-11 at 5 degrees C and -5 degrees C. The loading intermittent time has an obvious effect on the fatigue damage state of asphalt mixtures, while the longer the intermittent time, the less the effect on fatigue damage healing. Besides, the fatigue damage state has great influence on its healing potential of asphalt mixture. Under the low damage conditions, the initial healing rate is greater than the long term healing rate. However, the low temperature (-5 degrees C) dramatically reduces the healing rate of asphalt mixtures, and causes their long-term healing rate to stabilize gradually to a very low level. Especially under the high fatigue damage conditions, the healing potential of asphalt mixtures will almost disappear at -5 degrees C. Furthermore, together with meso-scale Computed Tomography (CT) scanning technique, it is found that the intemal crack distribution characteristics of different graded asphalt mixtures are different even under the same damage degree, which may explain the differences in the healing potential of asphalt mixtures. The use of a fast two-dimensional (2D) scanning technology further confirms that the crack zones inside the asphalt mixture are gradually shrinking after a period of high temperature healing. Finally, the Grey relational analysis reveals that the healing time has the most significant influence on the healing potential of asphalt mixtures. The gradation type and temperature have the similar influence level on the healing potential. The correlation degree between the fatigue damage degree and healing potential is the smallest compared with the other three factors. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2019
Keywords
Indirect tensile (IDT) fatigue, Damage degree, Healing potential, Computed Tomography (CT), Asphalt mixtures
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-262769 (URN)10.1016/j.conbuildmat.2019.07.040 (DOI)000487569100075 ()2-s2.0-85068884490 (Scopus ID)
Note

QC 20191022

Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-11-26Bibliographically approved
Chen, F., Coronado, C. F., Balieu, R. & Kringos, N. (2018). Structural performance of electrified roads: A computational analysis. Journal of Cleaner Production, 195, 1338-1349
Open this publication in new window or tab >>Structural performance of electrified roads: A computational analysis
2018 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 195, p. 1338-1349Article in journal (Refereed) Published
Abstract [en]

Given its promise for enhanced sustainability, electrified road (eRoad) has become a realistic option to support the clean and energy efficient Electrical Vehicles (EVs). To investigate the structural implications, this study focuses on a promising eRoad system which is a dynamic application of the Inductive Power Transfer (IPT) to provide electrical power wirelessly to EVs in-motion. A computational study is made in which, via a series of Finite Element Modeling (FEM) analyses on the eRoad structural response under various rolling conditions, is found that eRoads could have quite different pavement performances comparing to the traditional road (tRoad). Importantly, harsh loading due to vehicle braking or accelerating could incur higher potential of premature damage to the structure, whereas sufficient bonding at the contact interfaces would improve the structural integrity and delay the damage risks. In addition, localized mechanical discontinuities could also be a critical threat to the performance of the overall structure. To ensure that eRoads fulfill their sustainability promise, it is thus recommended that more focus should be placed on the possible measures, such as new structures and materials, to improve the structural integrity and thus the overall pavement performance of the integrated system.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Electrified Road, Inductive Power Transfer, Pavement Structure, Finite Element Modeling
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-229718 (URN)10.1016/j.jclepro.2018.05.273 (DOI)000440390900114 ()2-s2.0-85048130589 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 605405
Note

QC 20180611

Available from: 2018-06-06 Created: 2018-06-06 Last updated: 2018-08-16Bibliographically approved
Chen, F., Taylor, N., Balieu, R. & Kringos, N. (2017). Dynamic application of the Inductive Power Transfer (IPT) systems in an electrified road: Dielectric power loss due to pavement materials. Construction and Building Materials, 147, 9-16
Open this publication in new window or tab >>Dynamic application of the Inductive Power Transfer (IPT) systems in an electrified road: Dielectric power loss due to pavement materials
2017 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 147, p. 9-16Article in journal (Refereed) Published
Abstract [en]

Inductive Power Transfer (IPT) technology is seen as a promising solution to be applied in an electrified road (eRoad) to charge Electric Vehicles (EVs) dynamically, i.e. while they are in motion. Focus in this study was placed on the dielectric loss effect of pavement surfacing materials on the inductive power transfer efficiency, induced after the integration of the technology into the physical road structure. A combined experimental and model prediction analysis was carried out to calculate this dielectric loss magnitude, based on which some preliminary conclusions as well as a prioritization of future focus needs were summarized in detail.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Pavement materials, Dielectric loss, Inductive Power Transfer, Electric Vehicle
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-210988 (URN)10.1016/j.conbuildmat.2017.04.149 (DOI)000403854100002 ()2-s2.0-85018641699 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 605405
Note

QC 20170808

Available from: 2017-08-08 Created: 2017-08-08 Last updated: 2017-08-08Bibliographically approved
Chen, F., Balieu, R. & Kringos, N. (2017). Sustainable implementation of future smart road solutions: a case study on the electrified road. In: Andreas Loizos, Imad Al-Qadi, Tom Scarpas (Ed.), Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017): . Paper presented at 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields. Athens, Greece: CRC Press
Open this publication in new window or tab >>Sustainable implementation of future smart road solutions: a case study on the electrified road
2017 (English)In: Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017) / [ed] Andreas Loizos, Imad Al-Qadi, Tom Scarpas, Athens, Greece: CRC Press, 2017Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

An important feature of a future smart or multifunctional road is that an intrinsic integration of different new advances into the practical roads should be achieved, in terms of such as Car-to-Road communication, energy harvesting, autonomous driving or on-the-road charging. However, our current engineering and research communities do not necessarily allow for an optimal development of such integrated systems. To fill some of the knowledge gaps from infrastructure point of view, this research is focusing on a specific case of the electrified road (also called ‘eRoad’) that allows for on-the-road charging, in which the consequences and possible modifications of the road infrastructure are considered. Some preliminary analysis results are presented in this paper, from which it has been found that such kind of the integration could indeed influence the service performance of individual components of the whole system, while further studies should be carried out to ensure the implementation of these smart technologies is ultimately sustainable.

Place, publisher, year, edition, pages
Athens, Greece: CRC Press, 2017
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-226674 (URN)2-s2.0-85058507214 (Scopus ID)1351585789 (ISBN)
Conference
10th International Conference on the Bearing Capacity of Roads, Railways and Airfields
Note

QC 20180507

Available from: 2018-04-24 Created: 2018-04-24 Last updated: 2019-05-02Bibliographically approved
Chen, F., Balieu, R. & Kringos, N. (2017). Thermodynamics-based finite strain viscoelastic-viscoplastic model coupled with damage for asphalt material. International Journal of Solids and Structures, 129, 61-73
Open this publication in new window or tab >>Thermodynamics-based finite strain viscoelastic-viscoplastic model coupled with damage for asphalt material
2017 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 129, p. 61-73Article in journal (Refereed) Published
Abstract [en]

A thermodynamics based thermo-viscoelastic-viscoplastic model coupled with damage using the finite strain framework suitable for asphalt material is proposed in this paper. A detailed procedure for model calibration and validation is presented, utilizing a set of experimental measurements such as creep recovery, constant creep, and repeated creep-recovery tests under different loading conditions. The calibrated constitutive model is able to predict the sophisticated time- and temperature-dependent responses of asphalt material, both in tension and in compression. Moreover, a scenario case study on permanent deformation (rutting) prediction of a practical asphalt pavement structure is presented in this work. This paper presents the main features of this new constitutive model for asphalt: (1) A thermodynamics-based framework developed in the large strain context to derive the specific viscoelastic, viscoplastic and damage constitutive equations; (2) A viscoelastic dissipation potential involving deviatoric and volumetric parts, in which Prony series representations of the Lame constants are used; (3) A modified Perzyna's type viscoplastic formulation with non-associated flow rule adopted to simulate the inelastic deformation, using a Drucker-Prager type plastic dissipation potential; (4) A specific damage model developed for capturing the evolution disparity between tension and compression. As such, the developed model presents a robust, fully coupled and validated constitutive framework that includes the major behavioral components of asphalt materials, enabling thus an optimized simulation of predicted performance under various conditions. Further development improvements to the model in continued research efforts can be to include further environmental and physico-chemical material behavior such as ageing, healing or moisture induced damage.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2017
Keywords
Viscoelasticity, Viscoplasticity, Damage, Thermodynamics, Asphalt material
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-217400 (URN)10.1016/j.ijsolstr.2017.09.014 (DOI)000413616000006 ()2-s2.0-85029687854 (Scopus ID)
Note

QC 20171121

Available from: 2017-11-21 Created: 2017-11-21 Last updated: 2017-11-21Bibliographically approved
Ledesma, E. C., Chen, F., Balieu, R. & Kringos, N. (2017). Towards an understanding of the structural integrity of electrified roads through a combined numerical and experimental approach. In: TRB 96th Annual Meeting Compendium of Papers: . Paper presented at Transportation Research Board 96th Annual Meeting.
Open this publication in new window or tab >>Towards an understanding of the structural integrity of electrified roads through a combined numerical and experimental approach
2017 (English)In: TRB 96th Annual Meeting Compendium of Papers, 2017Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The continuous growth in road transportation demands further development towards sustainable strategies. The electrification of road infrastructure (commonly referred to as ‘e-Road’) to enable wireless charging solutions for Electric Vehicles (EVs) is arising as one of the most promising and yet challenging alternatives for the future mobility by road. In this context, the introduction of charging facilities in the pavement structure and its adequate performance from an infrastructural perspective is determining for the successful implementation of these systems.This study aims to evaluate the structural integrity of e-Roads, considering the embedment in the pavement of a solid module denominated ‘Charging Unit’ (CU) in which the charging facilities are assumed to be installed. To do so, the critical locations of an e-Road pavement structure were identified through computational modelling for its further representation as small-scale e-Road samples in the laboratory. Afterwards, this structure was subjected to different loading conditions using mechanical hydraulic devices and compared with conventional road samples produced under the same conditions. Finally, e-Road samples were scanned with X-ray Computed Tomography (CT) prior to, during and after loading for additional inspection. Results provided valuable learnings of the potential mechanisms of failure of such structure and a better understanding of the e-Road infrastructure. 

Keywords
Electrified Roads, Pavement, Mechanical Loading, X-Ray Computed Tomography
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-229719 (URN)
Conference
Transportation Research Board 96th Annual Meeting
Funder
EU, FP7, Seventh Framework Programme, 605405
Note

QC 20180611

Available from: 2018-06-06 Created: 2018-06-06 Last updated: 2018-06-20Bibliographically approved
Balieu, R., Kringos, N., Chen, F. & Córdoba, E. (2016). Multiplicative viscoelastic-viscoplastic damage-healing model for asphalt-concrete materials. In: RILEM Bookseries: (pp. 235-240). Springer Netherlands
Open this publication in new window or tab >>Multiplicative viscoelastic-viscoplastic damage-healing model for asphalt-concrete materials
2016 (English)In: RILEM Bookseries, Springer Netherlands , 2016, p. 235-240Conference paper (Refereed)
Abstract [en]

A viscoelastic-viscoplastic model based on a thermodynamic approach is developed under finite strain in this paper. By introducing a damage evolution, the proposed model is able to reproduce the behavior of Asphalt-Concrete materials until the complete fracture. Moreover, a recoverable part of the degradation is introduced to reproduce the self-healing observed under a sufficiently long rest period. The proposed model is implemented into a Finite Element code and good correlations between the numerical responses and the experiments have been observed. 

Place, publisher, year, edition, pages
Springer Netherlands, 2016
Keywords
Damage-Healing, Finite strains, Viscoelasticity, Viscoplasticity
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-216851 (URN)10.1007/978-94-024-0867-6_33 (DOI)2-s2.0-85029595485 (Scopus ID)
Note

Export Date: 24 October 2017; Article; Correspondence Address: Balieu, R.; Department of Civil and Architectural Engineering, KTH Royal Institute of TechnologiesSweden; email: balieu@kth.se. QC 20171128

Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2017-11-28Bibliographically approved
Chen, F., Taylor, N., Kringos, N. & Birgisson, B. (2015). A study on dielectric response of bitumen in the low-frequency range. Paper presented at 6th Conference of the European Asphalt Technology Association (EATA),Stockholm, Sweden, 15-17 June 2015.. International Journal on Road Materials and Pavement Design, 16, 153-169
Open this publication in new window or tab >>A study on dielectric response of bitumen in the low-frequency range
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 16, p. 153-169Article in journal (Refereed) Published
Abstract [en]

From the current state of literature, the dielectric property of bitumen has not been understood extensively, nor its relation with other properties such as polarity and rheology. In this study, dielectric spectroscopy measurement in a low-frequency range (10−2–106 Hz) was performed on both pure bitumen in different grades and wax-modified bitumen (WMB). From the performed tests we found the following: (i) the dielectric response of base bitumen is strongly temperature and frequency dependent, which is also highly linked to the rheology of the system. (ii) No remarkable differences in the dielectric constant (Formula presented.) among different grades of bitumen from the same crude oil source can be seen. (iii) Regular changes of dielectric loss tangent (tan δ) among the different grades of bitumen can be observed, which can be a good indicator for the linkage between the dielectric and rheological responses. In addition, it can also be perceived that the dielectric spectroscopy may have the potential to become a new approach for the multi-scale characterisation of road infrastructure materials.

Place, publisher, year, edition, pages
Taylor & Francis, 2015
Keywords
Dielectric Spectroscopy, Bitumen, Electrical Polarization, Rheology
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-163549 (URN)10.1080/14680629.2015.1029682 (DOI)000355122400010 ()2-s2.0-84929943889 (Scopus ID)
Conference
6th Conference of the European Asphalt Technology Association (EATA),Stockholm, Sweden, 15-17 June 2015.
Note

QC 20150616. Updated from accepted to published.

Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2017-12-04Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-9504-2008

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