Sun Jinfeng, Xu Zhiqiang, Li Weifeng, Shen Xiaodong
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.
Nanomaterials (Basel). 2017 May 3;7(5):102. doi: 10.3390/nano7050102.
The impact of nano-SiO₂ on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (/) of one. Nano-SiO₂ was used in partial substitution of AC$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.
研究了纳米二氧化硅对阿利特硫铝酸钙（AC$A）水泥早期水化性能的影响，水固比固定为1。纳米二氧化硅以0、1和3 wt%的比例部分替代AC$A水泥。采用量热法、X射线衍射（XRD）、热重/微商热重（TG/DTG）、压汞法（MIP）和扫描电子显微镜（SEM）分析对混合水泥的水化和水化物进行表征。纳米二氧化硅的加入显著促进了AC$A水泥的水化，导致放热量增加。相发展组成分析表明，纳米二氧化硅对AC$A水泥结晶水化产物的类型没有影响。此外，纳米二氧化硅对细化孔隙有显著的积极作用，在加入3%纳米二氧化硅时，三天时总孔隙率降低了54.09%。最后，通过扫描电子显微镜观察，纳米二氧化硅有利于生成比对照样品更致密的微观结构。
