Laboratory characterization of North Carolina base course aggregates for permanent deformation model development and calibration

Liang Chern Chow, Debakanta Mishra, Erol Tutumluer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents partial findings from an ongoing research study at the University of Illinois aimed at laboratory characterization of North Carolina base course aggregates for permanent deformation model development and calibration. Monotonic triaxial shear strength tests were first conducted on four different aggregate types to establish the Mohr-Coulomb failure envelopes. Repeated load triaxial tests were then conducted on the aggregate materials at shear stress/strength ratios of 0.25, 0.50, and 0.75, to comparatively evaluate the permanent deformation accumulation trends, and subsequently develop improved rutting models for use in mechanistic-empirical pavement design methodologies. Experimental results clearly emphasize the importance of applied stress states, material's shear strength, and number of load repetitions as the most significant factors affecting unbound aggregate permanent deformation behavior. A new model is proposed to adequately capture the effects of applied stresses and shear stress/strength ratios in predicting permanent deformation behavior of base course aggregates. This proposed model can potentially be used to improve the rutting models currently used in AASHTO's mechanistic-empirical flexible pavement design procedure the Pavement ME software.

Original languageEnglish (US)
Title of host publicationAsphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014
PublisherTaylor and Francis - Balkema
Pages755-763
Number of pages9
ISBN (Print)9781138027121
DOIs
StatePublished - 2014
Event12th International Conference on Asphalt Pavements, ISAP 2014 - Raleigh, NC, United States
Duration: Jun 1 2014Jun 5 2014

Publication series

NameAsphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014
Volume1

Other

Other12th International Conference on Asphalt Pavements, ISAP 2014
CountryUnited States
CityRaleigh, NC
Period6/1/146/5/14

Keywords

  • Applied stress states
  • Base course
  • Permanent deformation
  • Shear strength
  • Unbound aggregates

ASJC Scopus subject areas

  • Building and Construction
  • Architecture

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