AASHTO T 380-18

AASHTO T 380-18 Standard Method of Test for Potential Alkali Reactivity of Aggregates and Effectiveness of ASR Mitigation Measures (Miniature Concrete Prism Test, MCPT)

standard by American Association of State and Highway Transportation Officials, 2018

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AASHTO T 380-18 allows detection of the potential for deleterious alkali-silica reaction of aggregatein miniature concrete prisms within 56 days (8 weeks) for most of the aggregates. An additional28 days (4 weeks) may be necessary in the case of low/slow reacting aggregates to assess theirpotential reactivity. To assess the effectiveness of mitigation measures of SCMs (supplementarycementitious materials, such as fly ash, slag, silica fume, and others); the test method is conductedfor 56 days.