PREDICTING ASR LONG TERM EXPANSION THROUGH EXISTING TEST METHOD
DOI:
https://doi.org/10.11113/mjce.v27.15918Keywords:
Alkali-silica reaction, concrete, durability, cement, predictionAbstract
Alkali-silica reaction (ASR) related distress in the concrete is considered as the second most important concrete durability issue after corrosion. The modeling of ASR distress and prediction of ASR expansion in the real-life concrete structure is a matter of great difficulty. In this research article, the prediction equations were derived using a special mathematical function known as Spline. The equations were based on the actual expansion curves of known reactive aggregates, and of the mitigation measures (e.g., fly ash, slag etc.). The experimental expansions in the extended period, i.e., beyond 84 days, through the Miniature Concrete Prism Test (MCPT) method were compared with the predicted expansions matching the experimental age. The results indicated that the experimental and the predicted expansions matched very well with R 2 value close to 1. It was also found that the reaction reached at a steady state condition after certain curing days and this steady state condition continued throughout the extended test period. Also, for the mitigation measures using low lime fly ashes, meta-kaolin and slag at certain percent replacement levels of cement by weight; the experimental expansion correlated well with the predicted expansion. Therefore, the expansion prediction can be used confidently for both reactive aggregates and the mitigation measures.References
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