超吸水树脂对高性能水泥基复合材料收缩和水化的影响

doi:10.11896/cldb.23090194

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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.

Key words： super absorbent polymers high-performance cement-based material shrinkage property hydration property

Published: 25 November 2024 Online: 2024-11-22

CLC number:

TU528

Fund:National Natural Science Foundation of China,Excellent Young Scientists Fund (HK&Macau) (52122001),the Ope-ning Project of State Key Laboratory of Green Building Materials (2023GBM01),the Science and Technology Development Fund of Macau (0040/2022/A1),the China Postdoctoral Science Foundation (2022M713666).

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	Articles by authors
	ZHANG Cheng
	WANG Zhendi
	SHI Xinyu
	LI Tingzhong
	SUN Guoxing
	LIANG Rui

Cite this article:

ZHANG Cheng,WANG Zhendi,SHI Xinyu, et al. Effect of Super Absorbent Polymers on Shrinkage and Hydration Properties of High-performance Cement-based Composites[J]. Materials Reports, 2024, 38(22): 23090194-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23090194 OR http://www.mater-rep.com/EN/Y2024/V38/I22/23090194

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