Although there are several standard tests for measuring alkali-silica expansion produced by an aggregate, there is only one test suitable for measuring expansion produced by the cementitious material (C 441, Standard Test Method for Effectiveness of Mineral Admixtures of Ground Blast-Furnace Slag in Preventing Excessive Expansion of Concrete Due to the Alkali-Silica Reaction). This mortar test uses Pyrex glass as the standard reactive aggregate. A new test has been developed to overcome these deficiencies. Also a mortar test, it utilizes Vycor glass rather than Pyrex glass and a procedure that does not produce condensation on the bars, which causes leaching of alkalies from the mortar. The test has recently been adopted by ASTM as a provisional standard to determine whether hydraulic cement produces deleterious expansion when combined with alkali-reactive aggregate in concrete.
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