色散(光学)
材料科学
薄泥浆
高效减水剂
泥浆
肺表面活性物质
盐(化学)
水泥
压实
胶束
分散剂
化学工程
抗压强度
氯
氯化物
复合材料
纳米-
化学
有机化学
冶金
水溶液
工程类
物理
光学
作者
Xiaohong Niu,Guorui Feng,Han Yong,Qin Liu,Gaili Xue,Jiaqing Cui,Cheng Song
标识
DOI:10.1016/j.cemconcomp.2022.104587
摘要
Nano-SiO 2 (NS) is widely used to improve the performance of cement-based grouts. The workability and mechanical property of grouts are greatly affected by NS dispersion. In this paper, synergistic effect of surfactants and chloride salts on NS dispersion, as well as on performance of grouts including fluidity, mechanical and microscopic properties were systemically studied. The results showed that the synergistic effect of anionic surfactant (SDS) and chloride salt can effectively improve NS dispersion because of the massive formation of micelles that can encapsulate NS and the electrostatic repulsion between micelles. And the effect of CaCl 2 was more significant than NaCl. Furthermore, fluidity of fresh slurry and mechanical property of hardened grouts were also improved by the synergistic effect. The mechanical property enhancement might be attributed to the filling effect of NS due to its improved dispersion, and to the matrix compaction associated with the formation of strätlingite and Friedel's salt. • NS dispersion can be improved by the synergistic effect of SDS and chlorine salt. • The improvement of CaCl 2 on NS dispersion is better than that of NaCl. • Synergistic effect of SDS and chlorine salt can improve the fluidity of fresh slurry. • Formation of strätlingite and Friedel's salt enhances the strength of hardened grout.
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