Thin overlay analysis using finite element method

H. Dhasmana, H. Ozer, I. L. Al-Qadi

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

Abstract

Thin Asphalt Concrete (AC) overlays are generally used as a preservation treatment for rigid and flexible pavements to improve riding quality, extend service life, and reduce noise levels on pavements. However, analyzing thin asphalt layers is complicated compared with the conventional methods of mechanistic analysis because these layers are directly exposed to vehicular loading and environmental stimulations. The gradients of material properties resulting from aging and moisture damage, in addition to mix heterogeneity and complex microstructure, violate some of the basic assumptions of pavement evaluation used to date. The proposed research work aims to estimate the performance of thin AC overlays using a mechanistic approach addressing the existing complexities. Three-dimensional finite element simulations is developed, taking into account features such as vehicular loading, different layer thicknesses of the thin AC overlay layer and variations in material parameters. Changes in the behavior of critical response parameters in the pavement structure and the tire trajectory give an idea about the characteristic features of the mixes used and the properties of layers when subjected to external loads. It was concluded from this analysis that the behavior of a pavement structure with thin asphalt overlays is affected to a greater extent due to a variation in the thickness of overlay layer. In comparison, the impact of change in the linear viscoelastic characteristics of the mix types used was not very significant. Compressive and shear forces were found dominant in governing the performance of pavements.

Original languageEnglish (US)
Title of host publicationBearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017
EditorsAndreas Loizos, Imad L. Al-Qadi, A. Tom Scarpas
PublisherCRC Press/Balkema
Pages1443-1448
Number of pages6
ISBN (Print)9781138295957
DOIs
StatePublished - 2017
Externally publishedYes
Event10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017 - Athens, Greece
Duration: Jun 28 2017Jun 30 2017

Publication series

NameBearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017

Conference

Conference10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017
CountryGreece
CityAthens
Period6/28/176/30/17

ASJC Scopus subject areas

  • Civil and Structural Engineering

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