Early-age shrinkage development of ultra-high performance concrete under heat curing treatment

Author(s) : W. Li, Z. Huang, Z. Luo, W.H. Duan, S.P. Shah
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. ResplendinoT.Ch.
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 73 - 82
Total Pages : 10
Language : English

Abstract: The effects of a novel heat curing regime and longitudinal reinforcement ratio on early-age shrinkage of ultra-high performance concrete (UHPC) were experimentally investigated in this study. The microstructure, porosity and calcium hydroxide (CH) content of UHPC after different heat curing durations were characterized with scanning electron microscopy, mercury intrusion porosimetry and thermal analysis. The results indicate that slight shrinkage was observed when the heat curing duration was less than 60 min and curing temperature reached 48°C. However, when the heat curing duration approached 70 min and curing temperature was around 55°C, the early-age shrinkage increased dramatically. It was found that the early-age shrinkage is approximately 450 με after 48 h of heat curing. The results also show that the early-age shrinkage of UHPC significantly decreased by percentage of 33 to 60 % with the increase of longitudinal steel reinforcement ratio from 2.0 to 4.52 %.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00