Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties.
Study on the Influence of Nanosilica Sol on the Hydration Process of Different Kinds of Cement and Mortar Properties.
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纳米硅溶胶对不同种类水泥水化过程及砂浆性能影响的研究
DOI：
10.3390/ma14133653
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发表时间：
2021-06-30
期刊：
影响因子：
--
通讯作者：
Wang L
中科院分区：
文献类型：
--
作者：
Liu H;Li Q;Su D;Yue G;Wang L
与气相收集纳米二氧化硅相比，纳米二氧化硅溶胶在改善混凝土和砂浆性能方面具有很大的经济价值和应用意义。本研究通过水化热分析、X射线衍射分析等方法研究了纳米硅溶胶对不同类型水泥水化过程的影响，并对砂浆的凝结时间、力学性能和孔隙率等性能进行了研究，以表征纳米硅溶胶对砂浆宏观性能的影响。实验结果表明，纳米硅溶胶可以加快两种水泥的水化速度，促进水泥的水化反应程度，且这种促进作用随着纳米硅溶胶含量的增加而增强。同时，纳米二氧化硅溶胶能显著缩短两种水泥的凝结时间，且随着掺量的增加更加明显。纳米硅溶胶掺量过大会对砂浆的抗渗性产生不利影响。这可能是由于纳米二氧化硅颗粒在砂浆基质中形成的弱间隔造成的，这一点可以通过砂浆孔结构分布测试得到支持。同时，纳米硅溶胶对两种水泥水化的影响不同，掺入纳米硅溶胶后HBSAC水泥砂浆的抗压强度先增加后降低，而P·O42.5水泥砂浆的抗压强度在掺入纳米硅溶胶后逐渐增加。这表明纳米二氧化硅溶胶不能有效地促进高贝利特硫铝酸盐水泥砂浆中β-C2S的水化。综合以上试验结果可知，当纳米硅溶胶的掺量在1%左右时，对两种水泥的水化和砂浆性能的促进效果最好。
Compared with nanosilica collected in a gaseous state, nanosilica sol has great economic value and application significance for improving the performance of concrete and mortar. In this study, the influence of nanosilica sol on the hydration process of different kinds of cement is studied by means of hydration heat analysis, X-ray diffraction analysis (XRD) and other methods, and the properties of mortar such as setting time, mechanical properties and porosity are also studied to characterize the influence of nanosilica sol on the macroscopic properties of mortar. The experimental results show that nanosilica sol can accelerate the hydration rate of two kinds of cement and promote the hydration reaction degree of cement, and this promotion effect increases with the increase in nanosilica sol content. At the same time, nanosilica sol can significantly shorten the setting time of the two kinds of cement, and it is more obvious with the increase in content. Excessive content of nanosilica sol will adversely affect the permeability resistance of mortar. It may be caused by the weak interval formed by nanosilica particle clusters in the mortar matrix, which can be supported by the mortar pore structure distribution test. At the same time, the influence of nanosilica sol on the hydration of the two kinds of cement is different, and the compressive strength of HBSAC cement mortar increases first and then decreases after adding nanosilica sol; However, the compressive strength of P·O 42.5 cement mortar increases gradually after adding nanometer silica sol. This shows that nanosilica sol does not effectively promote the hydration of β-C2S in high belite sulfoaluminate cement (HBSAC) mortar. Based on the above experimental results, it can be concluded that when the content of nanosilica sol is about 1%, it has the best promotion effect on the hydration of the two kinds of cement and the performance of mortar.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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DOI：
10.1016/j.colsurfa.2009.07.050
发表时间：
2009-10-05
影响因子：
5.2
作者：
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通讯作者：
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