AASHTO TP 144-21 PDF

This test method allows for the detection of coarse aggregates that have the potential to form expansive alkali-silica reaction (ASR) gels if used in concrete. This method represents a completely new approach. Unlike current standard tests like ASTM 1260, ASTM 1293, and T 380, this test method relies on purely chemical tests rather than measurement of the physical expansion of mortar and concrete specimens. No concrete or mortar specimens are required. The test is also conducted in a sealed environment inside a test tube which overcomes the alkali leaching problems of some current test methods. The test is completed in 21 days compared to 16 days for ASTM C1260, 56 days for T 380, and 365 days for ASTM C1293.