Are there tests that can provide specific gravity and absorption of fine aggregate in a reasonable time period?
A. The need for prompt and accurate results in determining the specific gravity and absorption of construction aggregates has driven researchers to develop two new testing procedures. Many concrete producers may not be aware of these developments. These new procedures, primarily developed for the asphalt paving industry, have been monitored by the ASTM committee focused on road and paving materials. Either could be incorporated into your quality control program to reduce product variability. ASTM D 7172, Standard Test Method for Determining the Relative Density (Specific Gravity) and Absorption of Fine Aggregates Using Infrared, was approved in 2006. ASTM D 7370, Test Method for Determination of Relative Density and Absorption of Fine, Coarse, and Blended Aggregate using Combined Vacuum Saturation and Rapid Submersion, was approved in October 2008. Both methods outline procedures that use a specific proprietary automated testing system. In D 7172, technicians can determine a fine aggre
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