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Early age free shrinkage of fiber reinforced expansive self-consolidating concrete

Author(s): Quanqing Gao, Qi Cao and Mingli Cao
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:11
Language : English

Abstract: To improve the shrinkage cracking resistance of self-consolidating concrete (SCC), this paper investigated the effect of expansive agent (EA), fibers and the combination of EA and fibers on the shrinkage behavior of SCC with age of 10 h-5 d. Workability, free shrinkage and
compressive strength were tested. Twenty one types of samples were prepared including one control group, four EA contents (6%, 8%, 10%, and 12% mass fractions of cementitious materials), three steel fiber (SF) contents (0.25%, 0.50% and 0.75% volume fractions of concrete), three polypropylene fiber (PP) contents (0.05%, 0.10% and 0.15% volume fractions of concrete), two hybrid fiber contents as well as eight combinations of EA and fibers. Test results indicated that the shrinkage of SCC can be compensated when the EA content is only 6%. It also showed that fibers may inhibit the shrinkage and expansion of SCC. When the length change is less than 0.02% for SCC with no EA, the inhibition effect of PP on free shrinkage is greater than that of SF for specimens with equivalent fiber factor. However, when the expansion of SCC with EA is relatively large, SF restrains the free expansion of SCC more significantly compared with PP for specimens with equivalent fiber factor.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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