Effect of nano-silica on chemical and volume shrinkage of cement-based composites
Effect of nano-silica on chemical and volume shrinkage of cement-based composites
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纳米二氧化硅对水泥基复合材料化学收缩和体积收缩的影响
DOI：
10.1016/j.conbuildmat.2020.118529
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发表时间：
2020-06
影响因子：
7.4
通讯作者：
Yuguang Wang
中科院分区：
文献类型：
--
作者：
Jinbang Wang;Yong Cheng;Lianwang Yuan;Dongyu Xu;Peng Du;Pengkun Hou;Zonghui Zhou;Xin Cheng;Shuai Liu;Yuguang Wang
纳米材料改性水泥基材料因其在提高早期强度和耐久性方面的优势而受到广泛关注。然而，纳米材料对浆体化学收缩和混凝土体积收缩的影响研究较少。探讨了纳米SiO_2对浆体化学收缩和混凝土体积收缩的影响规律及其作用机理。结果表明，纳米二氧化硅的掺入加剧了浆体的化学收缩和混凝土的体积收缩。水泥浆体化学收缩和体积收缩随纳米二氧化硅掺量的增加而增大，特别是在早期阶段。当纳米SiO_2掺量为1.2%时，水泥3d和28d的化学收缩分别提高了93.7%和57.5%。混凝土的1d、7d和60d体积收缩分别提高了82.1%、66.7%和16.7%。纳米SiO2的收缩强化作用机理主要是其火山灰效应、成核效应和加速水化效应，加速了水泥水化。
Nano-materials modified cement-based materials have attracted wide attention due to their advantages of improving early strength and durability. However, few studies have been conducted on influence of nano-materials on chemical shrinkage of paste and volume shrinkage of concrete. Therein, the influence rules of nano-silica on chemical shrinkage of paste and volume shrinkage of concrete and its action mechanism have been explored and discussed. The result indicated that added nano-silica aggravated the chemical shrinkage of paste and volume shrinkage of the concrete. The paste chemical shrinkage and concrete volume shrinkage increased with the amount of nano-silica in particular as presented in early stage. The chemical shrinkage of cement at 3d and 28d increased by 93.7% and 57.5% respectively, when adding 1.2% nano-silica. Correspondingly, the 1d, 7d and 60d volume shrinkage of concrete increased by 82.1%, 66.7% and 16.7% respectively. The action mechanism of shrinkage intensification is mainly the pozzolanic effect, nucleation effect and acceleration hydration effect of nano-silica, which accelerated the cement hydration.
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