ASTM-C1260 › Historical Revision Information
Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
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Scope
1.1 This test method permits detection, within 16 days, of the potential for deleterious alkali-silica reaction of aggregate in mortar bars.
1.2 The values stated in SI units are to be regarded as standard. The values in inch-pound units are shown in parentheses, and are for informational purposes only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
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.
Because the specimens are exposed to a NaOH solution, the alkali content of the cement is not a significant factor in affecting expansions.
When excessive expansions (see Appendix X1) are observed, it is recommended that supplementary information be developed to confirm that the expansion is actually due to alkali-silica reaction. Sources of such supplementary information include: (1) petrographic examination of the aggregate (Guide C 295
When it has been concluded from the results of tests performed using this test method and supplementary information that a given aggregate should be considered potentially deleteriously reactive, the use of mitigative measures such as low-alkali portland cement, mineral admixtures, or ground granulated blast-furnace slag should be evaluated (see last sentence of 4.1).
Keywords
aggregate; alkali-silica reactivity; length change; mortar; sodium hydroxide; ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)
To find similar documents by ASTM Volume:
04.02 (Concrete and Aggregates)
To find similar documents by classification:
91.100.10 (Cement. Gypsum. Lime. Mortar)
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Document Number
ASTM-C1260-07
Revision Level
2007 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
June 1, 2007
Document Type
Test Method
Page Count
5 pages
Committee Number
C09.26