高吸水性高分子
收缩率
材料科学
抗压强度
微观结构
吸水率
水泥
复合材料
固化(化学)
火山灰
聚合物
溶解
多孔性
化学工程
硅酸盐水泥
工程类
作者
Dongbing Jiang,Xiangguo Li,Piqi Zhao,Yang Lv,Changjiao Li,Fulong Fan,Константин Соболев,Xin Cheng
标识
DOI:10.1016/j.cemconres.2023.107353
摘要
The existing commercial superabsorbent polymer (SAP) products have the intrinsic defects of low internal curing efficiency and weakening strength. In this paper, a novel type of organic-inorganic composite SAP (SAPN) modified by nano SiO2 was designed and synthesized. The absorption-desorption kinetics of SAP-N in alkali pore solution were measured to evaluate the structural stability and water retention capacity. The water transport process and distribution of SAP-N in cement pastes were studied using 1H NMR and X-ray computed tomography. In addition, the effect of SAP-N on the autogenous shrinkage, microstructure, and compressive strength of cement pastes was investigated. The research results demonstrated that the incorporation of nano SiO2 could enhance the absorption capacity of SAP in pore solution. The water retention capacity of SAP-N was increased by over 50 % compared to commercial SAPC, despite the dissolution of a proportion of nano SiO2. SAP-N exhibited a low agglomeration degree but a high effective utilization rate of internal curing water in cement pastes, and thus mitigated effectively the self-desiccation and autogenous shrinkage. The hydration degree of cement pastes internally cured with SAP-N was significantly enhanced owing to the pozzolanic effect of nano SiO2, which enabled the in-situ repair of residual voids and reduced capillary pore size, thus improving the long-term compressive strength.
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