无机添加剂对糯米灰浆性能影响及机理研究

摘要

采用扫描电镜(SEM)和X射线衍射(XRD)等分析技术,探讨了硫酸铝、明矾和工业石膏对糯米灰浆性能的影响及作用机理.结果显示:硫酸铝对于改善糯米灰浆的力学性能、耐冻融性和耐水性均有较大帮助；明矾对糯米灰浆的改善主要表现在力学性能方面；工业石膏对糯米灰浆在力学性能和耐候性方面均未有明显改善；3种添加剂对减缓和减少糯米灰浆收缩均表现出良好的效果.在实际应用中,建议采用一定比例的硫酸铝作为糯米灰浆的添加剂.%The influence of admixtures(aluminum sulfate,alum,gypsum) on properties of traditional sticky rice-lime mortar and its scientific mechanism was studied by means of SEM and XRD.Results indicate that addition of aluminum sulfate improves the mechanical property,freeze-thaw resistance and water resistance of sticky rice-lime mortar significantly.Whereas the addition of alum mostly improves the mechanical property of sticky rice-lime mortar.Gypsum has few contribution to improvement of mechanical property and weather resistance of sticky rice-lime mortar.All of these three admixtures have favorable effect on slowing down and reducing the shrink of sticky rice-lime mortar.Aluminum sulfate should be used as admixtures for sticky rice-lime mortar in conservation of cultural relics.