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Gyratory Testing Machine Usage in Monitoring HMA Quality

by Alfred B. Crawley, Mississippi Dep of Transportation, Jackson, United States,



Document Type: Proceeding Paper

Part of: Pacific Rim TransTech Conference?Volume II: International Ties, Management Systems, Propulsion Technology, Strategic Highway Research Program

Abstract:

This paper describes research conducted by the Mississippi Department of Transportation to investigate the potential of the U.S. Army Corps of Engineers' Gyratory Testing Machine (GTM) for use in monitoring the quality of hot mix asphalt (HMA) mixtures. HMA cores were obtained from the outside wheel paths of primary arterial routes and remolded in the GTM to develop a correlation between GTM compactive effort and `ultimate' in situ density. Field testing of HMA was conducted at seven sites. A GTM model 4-C was mounted in an enclosed truck which travelled to the different plants. GTM properties were found to be much more sensitive to variations in the mixture proportions than was Marshall stability. This testing indicated the ability of the GTM to quickly detect changes in HMA characteristics resulting from changes in the gradation and/or binder content.

Subject Headings: Asphalts | Mixtures | Quality control | Materials processing | Field tests | Concrete | Correlation

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