condition or microscope performance examination ASTM C 856 (AASHTO T To identify Staining of a Identifies small amounts of 299), products of freshly-exposed ASR gel whether they cause Immediate Annex uranyl- ASR in concrete surface expansion or not.Opal, a results acetate hardened and viewing natural aggregate, and treatment concrete under UV light carbonated paste can procedure results accordingly.Tests must be Staining of a To identify supplemented by Los Alamos products of petrographic examination and Immediate staining ASR in physical tests for determining surface with two results method hardened concrete expansion different concrete. reagents. ASTM C 1260 To test the (AASHTO potential for Very fast alternative to C T303), Immersion of deleterious 227. Useful for slowly Potential alkali mortar bars in alkali-silica 16 days reacting aggregates or those reactivity of alkaline solution reaction of that produce expansion late in aggregates at 80°C (176°F) aggregate in the reaction. (mortar-bar mortar bars method) Varies: first ASTM C measurement 1293, Preferred method of To determine at 7 days, Determination assessment. Best represents the potential then 28and of length Concrete prisms the field. Requires long test ASR 56 days, then change of stored over duration for meaningful expansion of 3,6,9,and 12 concrete due water at 38°C results. Use as a supplement months; to alkali-silica (100.4°F) to C 227,C 295, C 289, and C every 6 reaction 1260. Similar to CSA combinations. months as (concrete after that as test) necessary ASTM C To test the 1567, potential for Potential deleterious alkali-silica Very fast alternative to C alkali-silica Immersion of reactivity of 1293. Allows for evaluation reaction of mortar bars in combinations 16 days of effectiveness of cementitious alkaline solution of supplementary cementitious materials and at 80°C (176°F) cementitious materials. aggregate materials and combinations aggregate in mortar bars (accelerated
condition or performance microscope examination ASTM C 856 (AASHTO T 299), Annex uranyl- acetate treatment procedure To identify products of ASR in hardened concrete Staining of a freshly-exposed concrete surface and viewing under UV light Immediate results Identifies small amounts of ASR gel whether they cause expansion or not.Opal, a natural aggregate, and carbonated paste can results accordingly.Tests must be supplemented by petrographic examination and physical tests for determining concrete expansion Los Alamos staining method To identify products of ASR in hardened concrete. Staining of a surface with two different reagents. Immediate results ASTM C 1260 (AASHTO T303), Potential alkali reactivity of aggregates (mortar-bar method) To test the potential for deleterious alkali-silica reaction of aggregate in mortar bars Immersion of mortar bars in alkaline solution at 80°C (176°F) 16 days Very fast alternative to C 227. Useful for slowly reacting aggregates or those that produce expansion late in the reaction. ASTM C 1293, Determination of length change of concrete due to alkali-silica reaction (concrete test) To determine the potential ASR expansion of combinations. Concrete prisms stored over water at 38°C (100.4°F) Varies: first measurement at 7 days, then 28and 56 days, then 3,6,9,and 12 months; every 6 months as after that as necessary Preferred method of assessment. Best represents the field. Requires long test duration for meaningful results. Use as a supplement to C 227,C 295, C 289, and C 1260. Similar to CSA ASTM C 1567, Potential alkali-silica reactivity of combinations of cementitious materials and aggregate (accelerated To test the potential for deleterious alkali-silica reaction of cementitious materials and aggregate combinations in mortar bars Immersion of mortar bars in alkaline solution at 80°C (176°F) 16 days Very fast alternative to C 1293. Allows for evaluation of effectiveness of supplementary cementitious materials.
document_alkali_silica_reactions.docx