Gyratory Testing Machine Usage in Monitoring HMA Qualityby Alfred B. Crawley, Mississippi Dep of Transportation, Jackson, United States,
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 | Equipment and machinery | Mixtures | Materials processing | Concrete | Field tests | Correlation | Quality control
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