减缩剂和HCSA膨胀剂对UHPC力学性能和收缩性能的影响

doi:10.11896/cldb.20010114

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Abstract In this paper, we mainly compared the effects of ultra high performance concrete (UHPC) on strength and shrinkage when the shrinkage redu-cing agent and high performance concrete expansion agent (HCSA) were combined and mixed. The results show that the shrinkage reducing agent will delay the hydration of cement and increase the setting time, which is not conducive to the development of early strength of concrete. As the amount (0wt%—2wt%) of shrinkage reducing agent increases, the autogenous shrinkage of UHPC decreases. When the amount of shrin-kage reducing agent is 0.5wt%, the drying shrinkage can be effectively reduced. The HCSA expansion agent will accelerate the UHPC setting time and develop the early strength. HCSA expansion agent can reduce the number of harmful pores inside the concrete and reduce the total porosity, which can reduce the autogenous shrinkage and drying shrinkage of UHPC; When the agent is in excess, sufficient moisture cannot be obtained to participate in the hydration, and there is a risk of damaging the structure. When the shrinkage reducing agent and the HCSA expansion agent are compounded, the compressive strength and flexural strength of the UHPC are greater than those of the single anti-shrinkage agent, and less than the strength when the HCSA expansion agent is directly doped. When the 2wt% shrinkage reducing agent and the 10wt% HCSA expansion agent are compounded, the inhibition of UHPC shrinkage is the best and the mechanical properties of UHPC are high.

Key words： UHPC shrinkage reducing agent HCSA expansion agent compressive strength flexural strength autogenous shrinkage drying shrinkage

Published: 10 May 2021

CLC number:

TU5

Fund:Science and Technology Project of Transport Department of Hunan Province (Research on New Technology of Reinforcement and Repair of Prefabricated Concrete Bridge Joints Based on Ultra High Performance Concrete (UHPC)).

About author:: Jianqing Gong received his B.E. degree in civil engineering and Ph.D. degree in materials science from the Hunan University in Sep. 1985—July. 2008. He was appointed to the faculty upon graduation, and is currently a associate professor of the Hunan University. He has published more than 10 journal papers as the first author, published 3 monographs, applied 3 national invention patents and 8 national and provincial projects. He mainly engaged in the research and development of new building materials and the performance of high performance concrete. Presided over the National 863 High-tech Project, the National Natural Science Foundation of China, the National Key Research and Development Program, and the provincial natural science foundation.

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	GONG Jianqing
	LUO Hongkui
	ZHANG Yang
	GONG Xiao
	XIE Zeling
	WU Wuxing
	DAI Yuanfan

Cite this article:

GONG Jianqing,LUO Hongkui,ZHANG Yang, et al. Effect of Shrinkage Reducing Agent and HCSA Expansion Agent on Mechanical Properties and Shrinkage Properties of UHPC[J]. Materials Reports, 2021, 35(8): 8042-8048.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20010114 OR http://www.mater-rep.com/EN/Y2021/V35/I8/8042

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