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Title:

Mechanisms Controlling Shearing Resistance of Mixtures in the Superpave Gyratory Compactor

Accession Number:

01550202

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Rutting performance characterization of asphalt mixtures has attracted a lot of attention after the implementation of the Superpave Volumetric Mixture design method due to the lack of a stability or strength test in the volumetric design criteria. Different test and analysis methods have been proposed with a goal of accurately, as well as simply, predicting the rutting performance of designed mixtures. The simplicity and cost effectiveness of using the Superpave Gyratory Compactor (SGC) made many researchers interested to find a fundamental and practical way for rutting characterization during compaction. One of the promising tools used for characterization of asphalt mixture internal friction and stability during compaction in SGC is the Gyratory Pressure Distribution Analyzer (GPDA). This study is focused on understanding the mechanisms and fundamental material characteristics that control the shearing resistance of asphalt mixtures throughout the compaction in SGC. The main cause of reduction in internal friction of some mixtures during compaction is shown to be the buildup of pore binder pressure and static liquefaction at lower air voids although some other factors may affect this phenomenon as well. It is shown that the mixtures with lower aggregate packing, measured using an image analysis method in this study, are more prone to reduction in internal friction. It is thus necessary to ensure that higher packing and more contact points be formed by selection of gradation to reduce the risk of instability resulting from liquefaction (loss of internal friction). Measuring internal friction is a necessary compliment to volumetric mixture design.

Supplemental Notes:

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

Monograph Accession #:

01550057

Report/Paper Numbers:

15-3137

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Roohi Sefidmazgi, Nima
Bahia, Hussain

Pagination:

14p

Publication Date:

2015

Conference:

Transportation Research Board 94th Annual Meeting

Location: Washington DC, United States
Date: 2015-1-11 to 2015-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2015 Paper #15-3137

Files:

TRIS, TRB, ATRI

Created Date:

Dec 30 2014 1:03PM