引气剂对轻质抹灰石膏砂浆性能的影响

Effect of Air Entraining Agent on Properties of Lightweight Plastering Gypsum Mortar

摘要:

比较了高引气剂掺量-低轻质集料掺量与无引气剂-高轻质集料掺量对轻质抹灰石膏（LPG）砂浆物理力学性能的影响，并结合压汞法（MIP）和扫描电镜（SEM）分析了引气剂对抹灰石膏孔隙特征的影响.结果表明：掺入引气剂和轻质集料的抹灰石膏内部孔隙主要是气孔，随着引气剂掺量的增加，抹灰石膏内部孔隙率增加，但内部孔隙尺寸先增大后减小；高引气剂掺量-低轻质集料掺量LPG砂浆和无引气剂-高轻质集料掺量LPG砂浆达到相同性能时，引气剂可以大幅减少玻化微珠掺量，达到绿色环保节能.

Abstract:

The effects of high air entraining agent content-low lightweight aggregate content and non-air entraining agent-high lightweight aggregate content on the physical and mechanical properties of lightweight plastering gypsum （LPG） mortar were studied， and the effects of air entraining agent on the pore characteristic of plastering gypsum were analyzed using mercury intrusion porosimetry （MIP） and scanning electron microscopy （SEM）. The results show that the internal pores of plaster gypsum mixed with air entraining agent and lightweight aggregate are mainly pores. With the increase of air entraining agent content， the internal porosity of plastering gypsum increases， but the internal pore size first increases and then decreases. When the high air entraining agent content-low lightweight aggregate content LPG mortar and the non-air entraining agent-high lightweight aggregate content LPG mortar achieve the same performance， the air entraining agent can significantly reduce the amount of vitrified microbeads， achieving green environmental protection and energy conservation.