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Title:

Permanent Deformation Prediction of Unbound Granular Layers with Varying Moisture and Fines Content Using Constant Confining Pressure Stress Paths

Accession Number:

01622834

Record Type:

Component

Abstract:

Permanent deformation of the unbound granular layers is a major concern encountered in flexible pavements. In order to improve the rutting performance of multi-layer structures, it is necessary to mechanistically identify the factors that contribute to the progression of plastic deformations with the application of repeated traffic loads. Proper characterization of the deformation behavior of geomaterials in the laboratory can potentially decrease future maintenance costs due to excessive rutting of pavements. Current rutting models fail to incorporate factors such as moisture state, gradation and stress-paths, which are paramount to proper characterization of base and sub-base layers. Failing to incorporate these important features can potentially induce a systematic error that consequently will result in underestimation of the rutting performance of geomaterials in pavement foundations. The main motivation for this study was to develop a framework to successfully incorporate moisture state, fine content, and stress path sensitivity to rutting performance of geomaterials. A comprehensive laboratory experiment incorporating three different gradations of a limestone source molded at different moisture states was considered in this study. The specimens were in turn subjected to various constant confining pressure stress paths to capture the synergistic influence of moisture content, fines content, and the components of stress path on the rutting performance of the laboratory specimen. The analysis of the dissipated energy in the repeated dynamic loading conditions in this research provided valuable insights on the rutting sensitivity of the unbound granular layers subjected to moisture ingress.

Supplemental Notes:

This paper was sponsored by TRB committee AFS20 Standing Committee on Geotechnical Instrumentation and Modeling.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-02059

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Arteaga, Uriel B
Ashtiani, Reza Salehi

Pagination:

24p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Fines content; Geomaterials

Subject Areas:

Highways; Pavements

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-02059

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 10:44AM