Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)

Importancia y uso:

4.1 This test method provides a means of detecting the potential of an aggregate intended for use in concrete for undergoing alkali-silica reaction resulting in potentially deleterious internal expansion. It is based on the NBRI Accelerated Test Method (1-4).3 It is especially useful for aggregates that react slowly or produce expansion late in the reaction. However, it does not evaluate combinations of aggregates with cementitious materials nor are the test conditions representative of those encountered by concrete in service.

4.2 Because the specimens are exposed to a NaOH solution, the alkali content of the cement is not a significant factor in affecting expansions.

4.3 Results of tests conducted on an aggregate as described herein should form a part of the basis for a decision as to whether precautions should be taken against excessive expansion due to alkali-silica reaction. Refer to Guide C1778 for the interpretation of the test results from Test Method C1260.

Subcomité:

C09.50

Referida por:

C1260-23, C1105-23A, C1567-23, C1260-23, C1778-23, D7705_D7705M-12R19, C1260-23, C1293_C1293M-23A

Volúmen:

04.02

Número ICS:

91.100.10 (Cement. Gypsum. Lime. Mortar)

Palabras clave:

aggregate; alkali-silica reactivity; length change; mortar; sodium hydroxide;