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A Study on the Hydration Reaction Model of Expansive Additive of Ettringite-Gypsum Type
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 Title & Authors
A Study on the Hydration Reaction Model of Expansive Additive of Ettringite-Gypsum Type
Park Sun Gyu; Takahumi Noguchi; Kim Moo-Han;
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 Abstract
High-performance concrete (HPC), which is particularly sensitive to self-desiccation, is required to be durable even in severe environmental conditions, i.e. costal area, cold district, etc. However, in recent years, some attention was particularly given to cracking sensitivity of high performance concrete at early age. It has been argued and demonstrated experimentally that such concrete undergoes autogenous shrinkage due to self-desiccation at early age under restrained condition, nd, as a result, internal tensile stress may develop, leading to micro cracking and macro cracking. This shrinkage-introduced crack produces a major serviceability problem for concrete structures. One possible method to reduce cracking due to autogenous shrinkage is the addition of expansive additive. Tests conducted by many researches have shown the beneficial effects of addition of expansive additive for reducing the risk of autogenous shrinkage-introduced cracking. However, the research on hydration model of expansion additive has been hardly researched up to now. This paper presents a study of the hydration model of Ettringite-Gypsum type expansive additive. As a result of comparing forecast values with experiment value, proposed model is shown to expressible of hydration of expansive additive.
 Keywords
high-performance concrete;autogenous shrinkage;expansive additive;hydration reaction model;
 Language
Korean
 Cited by
1.
에트링가이트-석회 복합계 팽창재를 사용한 시멘트 경화체의 팽창모델에 관한 연구,박선규;

대한건축학회논문집:구조계, 2009. vol.25. 7, pp.87-94
1.
Modeling of volume changes of concrete mixed with expansive additives, Construction and Building Materials, 2015, 75, 266  crossref(new windwow)
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