Effect of Saturated Lightweight Aggregate and SRA on the Hydration Process and Autogenous Shrinkage of UHPC
XU Binbin1, OU Zhongwen1,2, LUO Wei1, LIU Na1, YUAN Wang1, FU Laiping1
1 Department of Military Infrastructure, Army Logistics University of PLA, Chongqing 400030, China 2 College of Material Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
Abstract: This paper investigated the influence of saturated lightweight aggregate, shrinkage reducing agent (SRA) and the combined effects of both on the hydration process and autogenous shrinkage of ultra-high performance concrete (UHPC) by testing the setting time, compressive strength, hydration heat autogenous shrinkage and relative humidity. The results showed that saturated lightweight aggregate and SRA can reduce autogenous shrinkage of UHPC. At 50% replacement of lightweight aggregate, the autogenous shrinkage decreased significantly, 7.2% of the reference. The reason can be ascribed to the fact that the internal curing water slowly released in 4 d, mitigating the self-desiccation effect, which indicated that internal curing was effective in reducing autogenous shrinkage of UHPC, but bad for its mechanical properties. Simultaneously, lightweight aggregate at lower replacement together with SRA exert an comprehensive effect on restriction of autogenous shrinkage of UHPC. The porous structure of lightweight aggregate produce certain adsorption effect of SRA, reducing its effective content in initial pore solution, maintaining the internal relative humidity to decrease autogenous shrinkage, and mitigating the adverse impact on the early strength and the hydration process.
徐彬彬, 欧忠文, 罗伟, 刘娜, 袁旺, 付来平. 饱水轻骨料和减缩剂对UHPC水化过程和自收缩的影响[J]. 材料导报, 2020, 34(22): 22065-22069.
XU Binbin, OU Zhongwen, LUO Wei, LIU Na, YUAN Wang, FU Laiping. Effect of Saturated Lightweight Aggregate and SRA on the Hydration Process and Autogenous Shrinkage of UHPC. Materials Reports, 2020, 34(22): 22065-22069.
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2020, Vol. 34 
