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Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

机译:纳米SiO2对铝硅酸盐水泥早期水化的影响

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摘要

The impact of nano-SiO2 on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (w/s) of one. Nano-SiO2 was used in partial substitution of AC$A cement at zero, one and three wt %. Calorimetry, X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetric (TG/DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses were used to characterize the hydration and hydrates of the blended cement. The hydration of the AC$A cement was significantly promoted, resulting in an increase of the heat released with the addition of nano-SiO2. Phase development composition analysis showed that nano-SiO2 had no effect on the type of crystalline hydration products of the AC$A cement. Moreover, nano-SiO2 showed significant positive effects on pore refinement where the total porosity decreased by 54.09% at three days with the inclusion of 3% nano-SiO2. Finally, from the SEM observations, nano-SiO2 was conducive to producing a denser microstructure than that of the control sample.
机译:以固定的水固比(w / s)为1的条件研究了纳米SiO2对硅铝磷酸盐(AC $ A)水泥的早期水合性能的影响。纳米SiO 2用于零,一和三重量%的AC $ A水泥的部分替代。使用量热法,X射线衍射(XRD),热重/导数热重(TG / DTG),压汞法(MIP)和扫描电子显微镜(SEM)分析来表征混合水泥的水化和水合物。大大促进了AC $ A水泥的水合作用,增加了纳米SiO2的释放热量。相发展组成分析表明,纳米SiO 2对AC $ A水泥的结晶水合产物的类型没有影响。此外,纳米SiO 2对孔的细化表现出显着的积极作用,其中包括3%的纳米SiO 2,三天内总孔隙率降低了54.09%。最后,从SEM观察,纳米SiO2有助于产生比对照样品更致密的微观结构。

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