适用于隧道混凝土裂缝修补的水性环氧树脂改性砂浆性能研究

摘要

A kind of modified aqueous epoxy mortar with high performance and high bond strength for rehabilitation of tunnel segment cracks is developed.The properties of the mortar,including flexural strength,compressive strength and bond strength,are studied;then the microstructure of the mortar is analyzed by means of scanning electron microscope (SEM) method.The testing results show that:1 )The flexural strength and compressive strength increase with the polymer-cement ratio increases;and then they decrease at a peak.2)The bond strength decreases with the polymer-cement ratio increases. 3)Compared to the traditional mortar,the bond strength of modified mortar increases by 20%-40%.%为提供一种可用于隧道管片破损及裂缝修补的高效修补材料，研发一种高强、高黏结性的水性环氧树脂改性水泥砂浆，研究改性砂浆抗折强度、抗压强度和黏结强度，并采用SEM等方法进行微观结构分析。试验结果表明：1）随聚灰比增大，抗折强度和抗压强度先增大后减小；2）在研究范围内，黏结强度随聚灰比的增加而减小；3）改性后砂浆黏结强度增大20％～40％。