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Title:

Optimum Testing Conditions to Measure HMA Fatigue and Healing Using Flexural Bending Test
Cover of Optimum Testing Conditions to Measure HMA Fatigue and Healing Using Flexural Bending Test

Accession Number:

01366091

Record Type:

Component

Abstract:

The beam fatigue test of hot-mix asphalt (HMA) has been used for nearly a half century. However, several conflicting results have been recently reported. This study attempts to optimize the test conditions such as waveform type (haversine vs. sinusoidal), incorporating rest periods between loading cycles and the effect of rest period on the healing of the HMA to minimize (eliminate) gross errors in the data analysis of the fatigue test results. In the deflection-controlled haversine test (ASTM D-7460) permanent deformations lead to a new equilibrium neutral position of the beam and the force output follows a sinusoidal waveform. This tends to bend the beam in both directions similar to the deflection-controlled sinusoidal test. This would produce erroneous fatigue results since the test assumptions do not match the actual test conditions. In contrast, the deflection-controlled sinusoidal test (AASHTO T-321) is more consistent than the deflection-controlled haversine test (ASTM D-7460). When tests, with and without rest periods, are compared for healing type of studies, it is even more important to use a deflection-controlled sinusoidal test in order to obtain a fair comparison and accurate healing results. Since neither the haversine waveform nor the sinusoidal waveform in the lab exactly simulates field conditions, it is important to use a sinusoidal waveform in order to obtain consistent results. It is recommended that ASTM changes the ASTM D-7460 designation and test procedure to require a deflection-controlled sinusoidal waveform instead of haversine.

Supplemental Notes:

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

Monograph Accession #:

01362476

Report/Paper Numbers:

12-1266

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Mamlouk, Michael
Souliman, Mena
Zeiada, Waleed

Pagination:

17p

Publication Date:

2012

Conference:

Transportation Research Board 91st Annual Meeting

Location: Washington DC, United States
Date: 2012-1-22 to 2012-1-26
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 2012 Paper #12-1266

Files:

PRP, TRIS, TRB

Created Date:

Feb 8 2012 5:00PM