1.1 This test method permits detection within 16 days of the potential for deleterious alkali-silica reaction of combinations of cementitious materials and aggregate in mortar bars. The cementitious materials are composed of various proportions of hydraulic cement, pozzolans and ground granulated blast-furnace slag.1.2 The test results are only valid for the specific combinations of pozzolan, slag, and reactive aggregates tested. 1.3 This test is not suitable for evaluating the