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Shrinkage Characteristics of 50MPa High-strength Concrete with Compositions of Cementitious Materials  

Jung, Hyung-Chul (고려대학교 건축.사회환경공학부)
Min, Kyung-Hwan (고려대학교 건축.사회환경공학부)
Yang, Jun-Mo (고려대학교 건축.사회환경공학부)
Yoon, Young-Soo (고려대학교 건축.사회환경공학부)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.13, no.3, 2009 , pp. 93-100 More about this Journal
Abstract
This study forms part of a research project that was carried out on the development and application of high-strength concrete for large underground spaces. In order to develop 50MPa high-strength concrete, eight optimal mixtures with different portions of fly ash and ground granulated blast furnace slag were selected. For assessments of shrinkage characteristics, free shrinkage tests with prismatic specimens and shrinkage crack tests were performed. The compressive strength was more than 30MPa at 7days, and stable design strength was acquired at 28days. High-strength concrete containing blast furnace slag shows large autogenous shrinkage, while large shrinkage deformations and cracks will occur when mixtures are replaced with large volumes of cementitious materials. Hence, for these high-strength concrete mixtures, the curing conditions of initial ages that affect the reaction of hydration and drying effects need to be checked.
Keywords
Autogenous shrinkage; Blast furnace slag; Drying shrinkage; Fly ash; High-strength concrete; Mixture;
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