Effect of Hydrogels Containing Nanosilica on the Properties of Cement Pastes
Effect of Hydrogels Containing Nanosilica on the Properties of Cement Pastes
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DOI：
10.3390/jcs5040105
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发表时间：
2021-04
影响因子：
3.3
通讯作者：
Babak Vafaei;K. Farzanian;A. Ghahremaninezhad
中科院分区：
文献类型：
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作者：
Babak Vafaei;K. Farzanian;A. Ghahremaninezhad
研究了纳米二氧化硅(NSI)水凝胶对水泥浆体自收缩、机械强度和电阻率的影响。用热重分析(TGA)、傅立叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)研究了水凝胶与周围胶凝基质之间的相互作用。水凝胶的加入降低了水泥浆体的自收缩，并且这种减少与水凝胶中NSI的浓度有关。掺入水凝胶的水泥浆体的抗压强度和电阻率均有所降低，且随水凝胶中NSI含量的增加而减小。与远离水凝胶的区域相比，靠近水凝胶的区域中水泥浆体的相组成发生了变化。在pH和温度升高的石灰溶液中，水凝胶中形成了Ca(OH)2和CaCO3，证明了含有NSI的水凝胶中形成了水化硅酸钙(C-S-H)，这表明含有NSI的水凝胶可能具有火山灰的潜力。
The effect of hydrogels containing nanosilica (NSi) on the autogenous shrinkage, mechanical strength, and electrical resistivity of cement pastes was studied. The interaction between the hydrogels and the surrounding cementitious matrix was examined using thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The addition of hydrogels decreased autogenous shrinkage in the cement pastes and this reduction showed a dependence on the concentration of NSi in the hydrogels. Compressive strength and electrical resistivity were reduced in the cement pastes with hydrogels and this reduction was decreased with increased concentration of NSi in the hydrogel. A change in the phase composition of the cement paste in the region close to the hydrogel was noted, compared to the region away from the hydrogel. In a lime solution with increased pH and temperature, Ca(OH)2 and CaCO3 were found to form within the hydrogels; evidence of calcium-silicate-hydrate (C-S-H) formation in the hydrogels with NSi was obtained, indicating the possible pozzolanic potential of the hydrogels with NSi.