AASHTO TP 144-21 PDF Download

The AASHTO TP 144-21 standard is a test method used to detect the potential of coarse aggregates to form expansive alkali-silica reaction (ASR) gels when used in concrete. This standard represents a new approach compared to existing tests like ASTM 1260, ASTM 1293, and T 380.

Unlike these tests, AASHTO TP 144-21 relies solely on chemical tests instead of measuring the physical expansion of mortar and concrete specimens. No concrete or mortar specimens are required for this test method. The test is conducted in a sealed environment inside a test tube, which helps overcome alkali leaching issues encountered in some existing methods.

Furthermore, the AASHTO TP 144-21 test is completed in a shorter timeframe of 21 days. In comparison, ASTM C1260 takes 16 days, T 380 takes 56 days, and ASTM C1293 requires 365 days to complete. This demonstrates the efficiency of the AASHTO TP 144-21 standard in determining the potential alkali-silica reactivity of coarse aggregates.