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Title:

Incremental Repeated Load Permanent Deformation Testing of Asphalt Mixtures

Accession Number:

01373446

Record Type:

Component

Abstract:

The provisional test protocol for the Repeated Load Permanent Deformation (RLPD) test known as flow number test (AASHTO TP 79-09) does not specify temperature and stress level. For this reason, different laboratories conduct the test at different temperatures and stress levels, from which the results could not be easily compared. In addition, the flow number is highly dependent on stress level and test temperature which can make the testing time and results unpredictable. In this paper, a new incremental RLPD test procedure is proposed, in which the sample is subjected to multiple stresses in several increments. Instead of a test being continued at one stress level until flow, it is terminated during the secondary stage and restarted at a new stress level. This provides the opportunity to repeat the test on the same sample at several temperatures and stress levels as long as the sample remains in the secondary stage of deformation. The Minimum Strain Rate (MSR) values at the end of each increment are the properties of the incremental RLPD test. From the RLPD test results of three different mixtures at various temperatures and stress levels, it was found that the effect of temperature and deviatoric stress on MSR is interchangeable. A variable total particulate (TP) that is the product of temperature and stress were defined to correlate to MSR. A master curve of MSR vs. TP was then used to characterize high temperature performance of the asphalt mixtures tested in this study at any stress level and test temperature.

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:

12-4381

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Azari, Haleh
Mohseni, Alaeddin

Pagination:

16p

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; Tables

Subject Areas:

Highways; Pavements; I31: Bituminous Binders and Materials

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-4381

Files:

TRIS, TRB

Created Date:

Feb 8 2012 5:23PM