超吸水树脂对高性能水泥基复合材料收缩和水化的影响  

Effect of Super Absorbent Polymers on Shrinkage and Hydration Properties of High-performance Cement-based Composites

作　　者：张铖 王振地[2] 史鑫宇 李庭忠 孙国星 梁瑞 ZHANG Cheng;WANG Zhendi;SHI Xinyu;LI Tingzhong;SUN Guoxing;LIANG Rui(Zhuhai UM Science&Technology Research Institute,Zhuhai 519000,Guangdong,China;State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China;Department of Civil and Architecture,Aarhus University,Aarhus 8000,Denmark;Institute of Applied Physics and Materials Engineering,University of Macao,Macao SAR 999078,China)

机构地区：[1]珠海澳大科技研究院,广东珠海519000 [2]中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024 [3]奥胡斯大学土木与建筑系,丹麦奥胡斯8000 [4]澳门大学应用物理及材料工程研究院,中国澳门999078

出　　处：《材料导报》2024年第22期192-198,共7页Materials Reports

基　　金：国家自然科学基金优秀青年科学基金项目(港澳)(52122001);绿色建筑材料国家重点实验室开放基金(2023GBM01);澳门科学技术发展基金(0040/2022/A1);中国博士后基金面上项目(2022M713666)。

摘　　要：本工作基于高原干燥环境下高性能混凝土收缩问题,研究了不同掺量的阴离子型聚丙烯酰胺超吸水树脂(SAP-YF)与商用聚丙烯酸型超吸水树脂(SAP-S)对水泥基材料在干燥环境下收缩性能的影响,结果表明,随着SAP掺量的增大,水泥基材料的自收缩与强度逐渐减小,干燥收缩则无明显变化;在考虑不影响强度及最大程度减缩的前提下,SAP-YF在水灰比为0.20条件下的最优掺量为0.20%,减缩率为28.21%;XRD与TG结果表明在养护至7 d时,掺有SAP的试件组的水化程度和固相组成含量的增幅相比于对照组有较为明显的改善。掺入SAP后,净浆试件基体内部的相对湿度能够维持在有利于胶凝材料水化的环境中,可持续7 d或更长时间,从而加速了胶凝材料的早期水化进程。基于XRD、TG试验与理论研究,建立了干燥环境下含SAP水泥基材料固相组成随养护时间的演变模型,这可为热力学模型计算及高原干燥环境下混凝土配合比设计提供数据支持。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.

关 键 词：超吸水树脂 高性能水泥基材料 收缩性能 水化性能 

分 类 号：TU528[建筑科学—建筑技术科学]