Effect of Shrinkage Reducing Agent and HCSA Expansion Agent on Mechanical Properties and Shrinkage Properties of UHPC
GONG Jianqing1,2, LUO Hongkui1,2, ZHANG Yang1,2, GONG Xiao3, XIE Zeling3, WU Wuxing3, DAI Yuanfan1,2
1 College of Civil Engineering, Hunan University, Changsha 410082, China 2 Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082, China 3 Hunan Provincial Expressway Construction and Development Corporation, Changsha 410000, China
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.
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2021, Vol. 35 
