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http://dx.doi.org/10.4334/JKCI.2015.27.5.569

A Study on the Cracking Control Effects of Shrinkage Reduction Concrete  

Choi, Hyeong-Gil (Graduate School of Engineering, Muroran Institute of Technology)
Kim, Gyu-Yong (Department of Architectural Engineering, Chungnam National University)
Noguchi, Takafumi (Department of Architecture, The University of Tokyo)
Publication Information
Journal of the Korea Concrete Institute / v.27, no.5, 2015 , pp. 569-577 More about this Journal
Abstract
The aim of this study is to qualitatively evaluate the cracking control effects of expansive concrete used in reinforced concrete building. The result of experiments in laboratory shows that autogenous shrinkage and drying shrinkage are suppressed by using expansive additive. The tensile stress-strength ratio is lower in expansive concrete than normal concrete under fully restrained condition. Compression stress could be effectively generated in early age in the walls in buildings by the use of expansive additive, and tensile stress due to drying shrinkage at later age eventually decreased. Additionally, visual observation at long-term ages shows that the cracking area of expansive concrete was approximately 35% of normal concrete, which confirms that the use of expansive additive reduces concrete cracking in reinforced concrete buildings.
Keywords
expansive additive; expansion-shrinkage; cracking; complete restraint test; restraint stress;
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