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Autogenous shrinkage of ultra high performance concrete considering early age coefficient of thermal expansion

Authors
Park, Jung-JunYoo, Doo-YeolKim, Sung-WookYoon, Young-Soo
Issue Date
25-May-2014
Publisher
TECHNO-PRESS
Keywords
ultra high performance concrete; coefficient of thermal expansion; autogenous shrinkage; setting properties; shrinkage reducing admixture; expansive admixture
Citation
STRUCTURAL ENGINEERING AND MECHANICS, v.49, no.6, pp.763 - 773
Indexed
SCIE
SCOPUS
KCI
Journal Title
STRUCTURAL ENGINEERING AND MECHANICS
Volume
49
Number
6
Start Page
763
End Page
773
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98493
DOI
10.12989/sem.2014.49.6.763
ISSN
1225-4568
Abstract
The recently developed Ultra High Performance Concrete (UHPC) displays outstanding compressive strength and ductility but is also subjected to very large autogenous shrinkage. In addition, the use of forms and reinforcement to confine this autogenous shrinkage increases the risk of shrinkage cracking Accordingly, this study adopts a combination of shrinkage reducing admixture and expansive admixture as a solution to reduce the shrinkage of UHPC and estimates its appropriateness by evaluating the compressive and flexural strengths as well as the autogenous shrinkage according to the age. Moreover, the coefficient of thermal expansion known to experience sudden variations at early age is measured in order to evaluate exactly the autogenous shrinkage and the thermal expansion is compensated considering these measurements. The experimental results show that the compressive and flexural strengths decreased slightly at early age when mixing 7.5% of expansive admixture and 1% of shrinkage reducing admixture but that this decrease becomes insignificant after 7 days. The use of expansive admixture tended to premature the setting of UHPC and the start of sudden increase of autogenous shrinkage Finally, the combined use of shrinkage reducing admixture and expansive admixture appeared to reduce effectively the autogenous shrinkage by about 47% at 15 days.
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