负载纳米SiO2的火山灰对传统石灰的改性研究

本文在单纯使用火山灰材料改性熟石灰的基础上,使用负载纳米SiO2的火山灰对灰浆进一步改性,得到的改性灰浆固化时间更短、力学性能得到提高、耐水性良好。综合使用X射线衍射仪(XRD)、热失重分析仪(TG)和扫描电子显微镜(SEM)对材料的改性机理做初步分析,结果表明火山灰材料的存在使熟石灰浆体在固化过程中同时发生火山灰反应和碳酸化反应,火山灰反应生成的C-S-H有效提高了灰浆的力学性能等；负载的纳米SiO2起到填充和促进火山灰反应进行等作用从而达到进一步改性的效果。

Study on Modification of Traditional Lime by Volcanic Ash Loaded with Nano-SiO2

In this paper, based on the simple use of volcanic ash material to modify slaked lime, the ash is loaded with nano-SiO2 to further modify the mortar. The obtained modified mortar has a shorter curing time, improved mechanical properties and good water resistance. The X-ray diffractometer (XRD), thermogravimetric analyzer (TG) and scanning electron microscope (SEM) were used to analyze the modification mechanism of the material. The results show that the presence of volcanic ash material caused the volcanic ash reaction and carbonation reaction to occur simultaneously in the solidification process of the slaked lime, and the C-S-H generated by the volcanic ash reaction effectively improved the mechanical properties of the mortar. The loaded nano-SiO2 acted to fill and promote the pozzolanic reaction to achieve further modification.