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Accelerated Mortar Bar Testing of Silica Fume, Metakaolin & Lithium Nitrate-Based Admixture Combinations

Laboratory Evaluation of ASR Mitigation

Compared the performance of various ASR mitigation materials.

TCG has access to several extremely reactive ASR aggregates and worked independently with two companies to determine the performance advantages of using varied addition rates of either metakaolin or silica fume in combination with different lithium nitrate dosages to mitigate ASR. Thirty-nine mixes were produced using varying ratios of pozzolan to lithium nitrate with three different aggregates. The test procedure used was CRD-662-09 for 14 days and 28 days of testing.

TCG analyzed the data and was able to get consent to combine all the data into a report for FMC. The data show that there are advantages to using combination systems with very reactive aggregates.