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Title:

Effect of Mixture Properties on Fatigue Failure Mechanism in Asphalt Concrete

Accession Number:

01589823

Record Type:

Component

Abstract:

Fatigue cracking is one of the major distresses in asphalt pavements. The AASHTO·T321 protocol for fatigue characterization using third point loading of a beam is popular in the engineering community due to its simple nature. This protocol requires testing specimens to failure under several strain levels using flexural fatigue loading. The specimen is considered to have failed when the stiffness of the beam is fifty percent of the undamaged stiffness. Empirical models relating initial tensile strain to number of cycles to failure have been developed through regression analysis. Asphalt concrete is viscoelastic in nature, so fatigue relationships developed are dependent on factors like loading rate, loading history, testing temperature, healing and aging. This article presents a critical evaluation of characteristic damage curves obtained from beam fatigue testing using viscoelastic continuum damage mechanics approach. Fatigue test data from one 12.5 mm nominal maximum aggregate size mixture and four 19.0 mm nominal maximum aggregate size asphalt concrete mixtures with different binder grades were used for the analysis. The statistical analysis indicates that there exists a unique relationship between the flexural pseudostiffness and amount of damage in the specimen. A point of inflection was found in the damage characteristic curve beyond which the material loses its structural integrity at a faster rate. It was observed that normalized pseudostiffness at this inflection point is dependent on mixture properties (like binder grade, nominal maximum aggregate size) and testing temperature.

Supplemental Notes:

This paper was sponsored by TRB committee AFK50 Standing Committee on Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-1128

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Swamy, Aravind Krishna
Daniel, Jo Sias
Harvey, John T

ORCID 0000-0002-8924-6212

Popescu, Lorina
Wu, Rongzong

Pagination:

17p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-1128

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 4:31PM