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Title:

Evaluation of Operational Variables That Can Improve Overlay Tester Results
Cover of Evaluation of Operational Variables That Can Improve Overlay Tester Results

Accession Number:

01589003

Record Type:

Component

Abstract:

The premature cracking of the hot mix asphalt (HMA) layers in flexible pavements is one of the major concerns of the pavement community. The Overlay Tester (OT) is considered by several highway agencies as a routine test to evaluate the cracking potential of HMA mixes in the laboratory setting. The repeatability of the number of cycles to failure measured with the OT is considered as a concern to reliably characterize the potential of HMA mixes to cracking. The main objectives of the work presented in this paper are to report on the process of evaluating the performance of the current OT test protocol and propose practical improvements when feasible. A laboratory evaluation of key steps in the OT test protocol was carried out on synthetic specimens to minimize the material-related variability and to improve the protocol of the OT test from the onset of gluing to the application of the repeated loads. HMA specimens prepared from a common mix were then tested using the modified protocol to verify the effectiveness of the proposed changes. Alternative parameters from the load-displacement curve that could serve as less uncertain surrogate crack assessment parameters were also evaluated. From this study, the consistency of parameters measured with the OT test seems to improve if the operational parameters proposed in the new guideline are followed.

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:

16-2317

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Garcia, Victor M
Miramontes, Alejandro
Garibay, Jose
Abdallah, Imad
Nazarian, Soheil

Pagination:

16p

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; Photos; References; Tables

Uncontrolled Terms:

Overlay tester; Test protocols

Subject Areas:

Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-2317

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Jan 12 2016 5:01PM