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Title:

Analysis of Failure Mechanism of Cold Recycled Bound Materials Using Dissipated Energy Fatigue Approaches

Accession Number:

01622434

Record Type:

Component

Abstract:

It is well known that fatigue is one of the main failure mechanisms in flexible pavements but this is not so well established in cold recycled bound materials (CRBM) as in hot mix asphalt. Using CRBM provides an environmental and economic advantage for pavements since they decrease energy and raw material consumption. Having information about how these mixes fail is essential to develop a trustworthy design methodology. This paper presents a laboratory fatigue study using indirect tensile fatigue tests in strain control mode. The material investigated contained reclaimed asphalt pavement (RAP), fly ash, and foamed bitumen and cement as stabilising agents. The data obtained in the laboratory has been analysed using four different approaches: Dissipated energy ratio (DER), Ratio of dissipated energy change (RDEC), displacement ratio approach and energy stiffness ratio. With these approaches crack initiation and propagation have been studied. The aim is to understand CRBM behaviour under cyclic loading and analyse the differences compared to hot mixes, investigating if the current practice of equating both materials’ failure criteria is accurate. The results presented in this paper show that the CRBM used behaves differently, and that the accepted failure criterion of 50% stiffness reduction for hot mix asphalt, is evidently not appropriate for this CRBM. Nonetheless, further understanding of the fatigue test, the failure criterion and how micro cracking affects the bearing capacity of CRBM layers is required.

Supplemental Notes:

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures. Alternate title: Analysis of the Failure Mechanism of Cold Recycled Bound Materials Evaluating Fatigue Performance Based on Dissipated Energy, Displacement Ratio and Energy Stiffness Ratio.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-00067

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Lacalle Jimenez, Helena Isabel
Edwards, J Paul
Thom, Nicholas

Pagination:

13p

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; Photos; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-00067

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 9:56AM