Alkali silica reaction

[1176] THE EFFECT OF FLY ASHES ON THE ASR MITIGATION IN CONCRETE WITH COMBINATION OF CALCIUM CARBONATE AGGREGATE AND ANDESITE AGGREGATE

Irfan PRASETIA¹, Takatoshi NAKAJIMA², Kazuyuki TORII² (1.Kanazawa University 2.金沢大学)

Keywords:Accelerated Curing Test, ASR, Fine Fly Ashes, Polarizing Microscopic Observation

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This study focuses on the ASR mitigation effect of fly ashes in concrete with a different proportion of non-reactive and reactive aggregate. Accelerated mortar bars and concrete prisms according to JIS and Danish test method were conducted. Proportion of 40% andesite and 60% calcium carbonate shows a pessimum effect. However, the addition of fine fly ashes shows a good ASR mitigation effect which the expansion ratio categorized as "innocuous". In addition, a post analysis such as uranyl fluorescence method and polarizing microscopic observation were adding confidence with these results.