United States Department of Transportation
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The effects of coarse aggregate cleanliness and moisture content on asphalt concrete compactability and moisture susceptibility.
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2011-12-31
[PDF-23.10 MB]
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Edition:Final report; Jan. 11, 2008-Dec. 31, 2011.
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Abstract:Twelve field projects were studied where forty-four locations were evaluated to assess the cause or
causes of asphalt concrete that exhibits ‘tender zone’ characteristics (i.e. instability during compaction) and to
investigate the tendency of these mixes to be susceptible to moisture damage over time. Data was collected
during construction and samples were taken and used to conduct multiple laboratory tests. All field and
laboratory data was used to develop multiple regression equations to predict final in place air voids and moisture
susceptibility. The overall conclusion from the research was that compactability appeared to be predicted in a
reasonable manner while moisture susceptibility did not. The Methylene Blue test appears promising when used
in conjunction with moisture content (cold feed and mix moisture contents were measured) as a means of
providing guidance for achieving higher in place density. The tensile strength ratio (TSR) test as performed in
this research on laboratory compacted specimens was found to be questionable in terms of its ability to predict
field moisture susceptibility.
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