Effect of Super Absorbent Polymers on Shrinkage and Hydration Properties of High-performance Cement-based Composites
ZHANG Cheng1, WANG Zhendi2, SHI Xinyu3, LI Tingzhong1,4, SUN Guoxing1,4, LIANG Rui1,*
1 Zhuhai UM Science & Technology Research Institute, Zhuhai 519000, Guangdong, China 2 State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China 3 Department of Civil and Architecture, Aarhus University, Aarhus 8000, Denmark 4 Institute of Applied Physics and Materials Engineering, University of Macau, Macau SAR 999078, China
Abstract: Based on the shrinkage problem of high-performance concrete in high-altitude dry environments, the effects of different dosage of the anionic polyacrylamide polyacrylate superabsorbent polymers (SAP-YF) and a commercial polypropylene-based super absorbent polymers (SAP-S) on the shrinkage properties of cement-based materials under high-altitude dry environment were studied. The test results showed that with an increase in SAP dosage, the autogenous shrinkage and strength of the cement-based materials gradually decreased, while the drying shrinkage remained relatively unchanged. Considering the premise of not affecting the strength and minimizing shrinkage, the optimal dosage of SAP-YF was 0.20% under a water-cement ratio of 0.20, with a shrinkage reduction rate of 28.21%. XRD and TG results showed that the hydration degree and solid phase composition of the SAP-containing specimens exhibited significant improvements compared to the control group after 7 d of curing. The introduction of SAP helped maintain the internal moisture content of the paste matrix, creating an environment conducive to the hydration of cementitious materials for 7 d or more. The inclusion of SAP accelerated the early hydration process of cementitious materials. Based on XRD, TG experiments, and theoretical research, a model for the evolution of solid-phase composition of cement-based materials containing SAP with curing time under dry conditions was established, which could provide data support for thermodynamic model calculations and concrete mix design in high-altitude dry environments.
张铖, 王振地, 史鑫宇, 李庭忠, 孙国星, 梁瑞. 超吸水树脂对高性能水泥基复合材料收缩和水化的影响[J]. 材料导报, 2024, 38(22): 23090194-7.
ZHANG Cheng, WANG Zhendi, SHI Xinyu, LI Tingzhong, SUN Guoxing, LIANG Rui. Effect of Super Absorbent Polymers on Shrinkage and Hydration Properties of High-performance Cement-based Composites. Materials Reports, 2024, 38(22): 23090194-7.
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2024, Vol. 38 
