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Evaluation of a permanent deformation model for asphalt concrete mixtures using extra-large wheel tracking and heavy vehicle simulator tests
KTH, School of Architecture and the Built Environment (ABE), Transport Science. Swedish National Road and Transport Research Institute, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Transport Science. Swedish National Road and Transport Research Institute, Sweden.
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 16, no 1, 154-171 p.Article in journal (Refereed) Published
Abstract [en]

This paper evaluates a mechanistic–empirical permanent strain model for asphalt concrete mixtures. The evaluation was carried out based on two different types of tests: an extra-large wheel-tracking (ELWT) test and a full-scale accelerated pavement test using a heavy vehicle simulator (HVS). Asphalt slabs from three different types of asphalt mixtures were prepared for the ELWT test and tested at several pavement temperatures and tyre inflation pressures. Lateral wandering was also incorporated. The measured permanent deformations in the asphalt slabs were thereafter modelled using the permanent strain model from the US Mechanistic-Empirical Pavement Design Guide and model parameters were estimated for the three types of mixes. For validation, data from an HVS tested pavement structure consisting of the same asphalt mixtures as those tested using the ELWT were used. A set of calibration factors for the three mixtures were therefore obtained between the two tests. In all cases, the calibration factors were within ±20% from unity. Differences in geometry, scale, wheel loading configuration as well as the speed of loading between the two test devices could be the possible reasons for the differences in observed calibration factors.

Place, publisher, year, edition, pages
2015. Vol. 16, no 1, 154-171 p.
Keyword [en]
asphalt concrete, heavy vehicle simulator, permanent deformation, traffic wandering, wheel-tracking test
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145144DOI: 10.1080/14680629.2014.987311ISI: 000349451300010Scopus ID: 2-s2.0-84922800575OAI: oai:DiVA.org:kth-145144DiVA: diva2:716761
Note

QC 20150310. Updated from manuscript to article in journal.

Available from: 2014-05-12 Created: 2014-05-12 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Mechanistic-Empirical Modelling of Flexible Pavement Performance: Verifications Using APT Measurements
Open this publication in new window or tab >>Mechanistic-Empirical Modelling of Flexible Pavement Performance: Verifications Using APT Measurements
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mechanistic-Empirical  (M-E)  pavement  design  procedures  are  composed  of  a  reliable  response model to estimate the state of stress in the pavement and distress models in order to predict the different types of pavement distresses due to the prevailing traffic and environmental conditions. One of the main objectives of this study was to develop a response model based on multilayer elastic  theory   (MLET)  with  improved  computational  performance  by   optimizing  the   time consuming parts of the MLET processes. A comprehensive comparison of the developed program with  two  widely  used  programs  demonstrated  excellent  agreement  and  improved  computational performance.  Moreover,  the  program  was  extended  to  incorporate  the  viscoelastic  behaviour  of bituminous materials through elastic-viscoelastic correspondence principle. A procedure based on collocation of linear viscoelastic (LVE) solutions at selected key time durations was also proposed that improved the computational performance for LVE analysis of stationary and moving loads. A comparison  of  the  LVE  responses  with  measurements  from  accelerated  pavement  testing  (APT) revealed a good agreement. Furthermore the developed response model was employed to evaluate permanent deformation models  for  bound  and  unbound  granular  materials  (UGMs)  using  full  scale  APTs.  The  M-E Pavement  Design  Guide  (MEPDG)  model  for  UGMs  and  two  relatively  new  models  were evaluated  to  model  the  permanent  deformation  in  UGMs.  Moreover,  for  bound  materials,  the simplified  form  of  the  MEPDG  model  for  bituminous  bound  layers  was  also  evaluated.  The measured  and  predicted  permanent  deformations  were  in  general  in  good  agreement,  with  only small discrepancies between the models. Finally, as heavy traffic loading is one of the main factors affecting the performance of flexible pavement, three types of characterizations for heavy traffic axle load spectrum for M-E analysis and design of pavement structures were evaluated. The study recommended an improved approach that enhanced the accuracy and computational performance. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. x, 60 p.
Series
TRITA-TSC-PHD, 14:003
Keyword
Flexible Pavement; Pavement Performance Models; Multilayer Elastic Theory; Linear Viscoelasticity; Rutting; Accelerated Pavement Testing; Heavy Vehicle Simulator
National Category
Infrastructure Engineering
Research subject
Transport Science; Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-145136 (URN)978-91-87353-39-0 (ISBN)
Public defence
2014-05-23, Q2, Osquldas väg 10, KTH, Stockholm, 13:30 (English)
Opponent
Supervisors
Note

QC 20140512

Available from: 2014-05-12 Created: 2014-05-12 Last updated: 2014-05-19Bibliographically approved

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