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

Jung Jun Park, Doo Yeol Yoo, Sung Wook Kim, Young Soo Yoon

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)763-773
Number of pages11
JournalStructural Engineering and Mechanics
Volume49
Issue number6
DOIs
Publication statusPublished - 2014 Mar 25

Keywords

  • Autogenous shrinkage
  • Coefficient of thermal expansion
  • Expansive admixture
  • Setting properties
  • Shrinkage reducing admixture
  • Ultra high performance concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Mechanical Engineering

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