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Development of a Type IP Cement Supplementary Report 3: Effect of Natural Pozzolans and Fly Ash on Alkali Silica Reactivity
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1993-03-31
[PDF-19.12 MB]
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Edition:Final; May 1992 to March 1994
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Abstract:Alkali-silica reactivity (ASR) produces a major problem in concrete structures. This report presents an experimental investigation to identify a natural pozzolan and to determine the optimum quantity that can be blended with cement to produce a Type IP cement for inhibiting the ASR For comparative evaluation a Class F fly ash has also been investigated along with the pozzolans. Two methods, ASTM P214 and ASTM C227 were adopted for assessing the effectiveness of the pozzolans in controlling the ASR. Three percentages of 10%, 20% and 30% replacements of cement with fly ash were investigated. A total of 30 natural pozzolans were collected in the Black Hills area. Their chemical and mineralogical compositions and some physical properties such as fineness, and density were determined. The strength activity test (ASTM C3l l) was used in eliminating the pozzolans that would adversely affect the strength of concrete. Based on this test, ten pozzolans were selected for detailed study. The ASR expansions measured using the ASTM P214 test method had shown that two pozzolans were more effective than the Class F fly ash in inhibiting the ASR expansion.
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