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Title:

Use of Distortion Energy as Fundamental Design Parameter for Predicting Asphalt Fatigue Damage

Accession Number:

01154905

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The elastic distortion energy (ED) is one of the magnitudes that provide information on any continuum mechanical state. It consists in the part of the total deformation energy that produces a change in shape for constant volume, and depends on the relative differences between principal stresses. This paper explores the use of this variable as a fundamental parameter for asphalt fatigue. In the first place, bending fatigue tests are compared to indirect-tension tests from the mechanical point of view, and the laboratory results for a particular asphalt concrete mix are presented. A significant part of the experimentally contrasted differences between the results from the two fatigue tests can be explained by ED. ED also provides an explanation for the asphalt performance that can be observed in thick pavements and, in particular, for top-down cracking. Modeling shows that a critical situation exists for the asphalt mix at the top (up to 100 mm in depth) of a thick (350 mm) pavement, since the level of elastic distortion energy is considerably higher than at the bottom. Several issues are presented in this paper that support the possibility of asphalt fatigue being governed by actual differences between principal stresses (or strains), rather than the principal stresses (or strains) themselves, thus introducing a new approach to asphalt fatigue, which has been traditionally assumed to be caused only by tensile strains. Finally, the asphalt mechanical state is evaluated at several depths into a thick (350 mm) asphalt pavement and the results are presented by Mohr’s circles. Conclusions are extracted from the comparison of such mechanical states with those induced during bending and indirect-tension fatigue tests.

Monograph Accession #:

01147878

Report/Paper Numbers:

10-0695

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Mateos, Angel

Pagination:

18p

Publication Date:

2010

Conference:

Transportation Research Board 89th Annual Meeting

Location: Washington DC, United States
Date: 2010-1-10 to 2010-1-14
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (10) ; References (19) ; Tables (2)

Subject Areas:

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Source Data:

Transportation Research Board Annual Meeting 2010 Paper #10-0695

Files:

TRIS, TRB

Created Date:

Jan 25 2010 10:20AM