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http://dx.doi.org/10.4334/JKCI.2002.14.5.631

Hydration of Expansive Materials with CSA-System  

정성철 (청주대학교 건축공학과)
송명신 (명지대학교 세라믹공학과)
이경희 (명지대학교 세라믹공학과)
한천구 (청주대학교 건축공학과)
Publication Information
Journal of the Korea Concrete Institute / v.14, no.5, 2002 , pp. 631-637 More about this Journal
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.
Keywords
CSA; gypsum; lime; ettringite; monosulfate; ″R″; curing in water; shrinkage compensate;
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