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Title |
Hydration of Expansive Materials with CSA-System
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Keywords |
칼슘설포아루미네이트; 무수석고; 생석회; 에트링자이트; 모노설페이트; R 값; 수중양생; 수축보상; CSA; gypsum; lime; ettringite; monosulfate; ″R″; curing in water; shrinkage compensate |
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Abstract |
This paper deals with hydration properties of the OPC with CSA-system expansive materials. In OPC using CSA, that was formed monosulfate for the main part. but In OPCs using CSA and gypsum, using CSA and gypsum and lime, that were formed ettringite for the main part. On the shrinkage ratio, the former is larger than the latter And CSA-system with gypsum and lime is smallest of all systems. According to dimension of shrinkage ratios are as follows; OPC using CSA only＞ OPC only＞ OPC using CSA and gypsum＞ OPC using CSA, gypsum and lime. And "R"s are 0.32, 0.37, 0.8, 0.8, 0.8 each others. In OPC with CSA-system expansive materials, we know that expansive properties were depend upon the value of "R". "R" means supplying quantities about demanding quantities for ettringite. In the case of expansive materials with CSA-system and lime, it is to be rich Ca(OH)₂ in the solution. so, it is formed small ettringite as the needle shapes. they are contribute to expansive.
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