Evaluation of Mitigation Measures and Development of an Ultra-Accelerated Test to Evaluate Alkali Silica Reaction Potential in Concrete
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2022-08-01
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Edition:Final Report
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Abstract:A comprehensive study was performed to evaluate mitigation options to reduce premature expansion due to alkali-silica reaction (ASR) for selected Wyoming aggregates. State-of-the-art and standardized test methods were performed, and results were used to compare expansion levels. Two different fly-ash sources were tested using the Concrete Prism Test (CPT). All the fly ash sources mitigated the moderately reactive aggregates; the most highly expansive aggregate was mitigated by only one of the fly ash sources. An ultrarapid test, the Autoclave Concrete Prism Test (ACPT) was comprehensively evaluated by a robust testing program exceeding 150 specimens and compared results with those in the literature. For separated coarse and fine aggregate fractions, test data confirms that a limit of 0.09 percent expansion produces a 97.2 percent accuracy for 36 tested concrete mixtures. Miniature Concrete Prism Test (Min-CPT) and outdoor exposure block (OEB) results are also presented for selected aggregates. The ultrarapid test method was applied to another group specimens cast using recycled concrete aggregate (RCA) as the coarse aggregate source. An interlaboratory study was conducted to evaluate the effect of different operators on the measuring process. Results fell within the coefficient of variation for the CPT. Another study evaluated results of seven laboratories conducting ACPTs. Again, those results are within the CPT standard indicating that those limits could also be applied for RCA.
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