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http://dx.doi.org/10.4334/JKCI.2003.15.6.785

Properties on the Shrinkage of High Performance Concrete Using Expansive Additive and Shrinkage Reducing Agent  

Han, Cheon-Goo (Dept. of Arichtectural Engineering, Chongju University)
Kim, Sung-Wook (Korea Institute of Construction Technology)
Koh, Kyoung-Taek (Korea Institute of Construction Technology)
Pei, Zheng-Lie (Dept. of Arichtectural Engineering, Chongju University)
Publication Information
Journal of the Korea Concrete Institute / v.15, no.6, 2003 , pp. 785-793 More about this Journal
Abstract
This study is intended to analyze the effectiveness of expansive additive, shrinkage reducing agent and combination of the two to reduce the autogenous and drying shrinkage of high performance concrete using mineral admixture such as fly ash, blast furnace slag powder and silica fume. According to results, when expansive additive and shrinkage reducing agent are mixed within an appropriate mixing ratio, fluidity and air content are not influenced, and the enhancement of compressive strength is favorable at the age of 91 and 180days. At the mixing ratio of expansive additive of 5% and 10%, the autogenous and drying shrinkage is reduced by 32∼68% and 25∼49% respectively in comparison with plain concrete. And they are reduced by 18∼34% and 16∼26% respectively at the mixing ratio of shrinkage reducing agent of 0.5% and 1.0%, compared with plain concrete. The mixture of EA-SR combined with expansive additive and shrinkage reducing agent is most effective for reduction of shrinkage. Therefore, it is considered that the using method in combination with expansive additive and shrinkage reducing agent is effective to reduce the shrinkage of high performance concrete using mineral admixture such as fly ash, blast slag powder and silica fume.
Keywords
high performance concrete; drying shrinkage; autogenous shrinkage; expansive additive; shrinkage reducing agent;
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