This test method covers the determination of the amount of draindown material in an uncompacted asphalt mixture sample when the sample is held at elevated temperatures comparable to those encountered during the production, storage, transport, and placement of the mixture. The test is particularly applicable to mixtures such as porous asphalt (open-graded friction course) and Stone Matrix Asphalt (SMA).
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AASHTO T 305-22
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Standard Method of Test for Determination of Draindown Characteristics in Uncompacted Asphalt Mixtures
American Association of State Highway and Transportation Officials , 2022