# 6506-8 - VOLUMETRIC PROPERTIES OF MIXTURES Maximum Specific...

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VOLUMETRIC PROPERTIES OF MIXTURES Maximum Specific Gravity , G mm Specific gravity of an asphalt mixture when there is no air voids. This can be measured by ASTM 2041 test procedure, which is also known as the Rice Test. Effective Specific Gravity of Aggregate, G se (for 100 g of mix) = P s / (100/G mm - P b /G b ) __________________________________________ 100/G mm = Volume of mixture with no air voids P b /G b = Volume of asphalt Maximum specific gravities of mixtures, G mm , at different asphalt contents can be computed by assuming that the asphalt absorption is constant and thus the effective specific gravity of the aggregate is constant at all asphalt contents. G mm = 100 / (P s /G se + P b /G b ) _________________________________ P s /G se = Effective volume of aggregate P b /G b = Volume of asphalt

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Asphalt Absorption , P ba is expressed as a percent by weight of the aggregate P ba = (100/G sb - 100/G se ) G b where 100/G sb = bulk volume of aggregate 100/G se = effective volume of aggregate ______________________________________ Effective Asphalt Content , P be = P b - P ba P s /100 where P ba P s /100 = % asphalt absorption by weight of mix Air Voids in Compacted Mixture , P a = V a / V
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