低温养护对环氧树脂基砂浆早期性能的影响及机理  

Effect and Mechanism of Low Temperature Curing on the Early Performance of Epoxy Resin Based Mortar

作　　者：吕炎 白二雷[1] 王志航 夏伟 LYU Yan;BAI Erlei;WANG Zhihang;XIA Wei(Aviation Engineering School,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]空军工程大学航空工程学院,西安710038

出　　处：《材料导报》2024年第5期98-103,共6页Materials Reports

基　　金：国家自然科学基金(52278287)。

摘　　要：环氧树脂基砂浆是一种快速修补材料,为研究低温养护条件对环氧树脂基砂浆工作性能及早期力学性能的影响,构建了全过程低温环境,分别进行了抗压强度、抗折强度、流动度、凝结时间以及内部温度测试,分析了环氧树脂基砂浆的微观结构。结果表明:环氧树脂基砂浆性能受养护温度影响较大,当养护温度为0℃时,流动度仅为112 mm,但随着温度升高流动度增长较快;低温养护使得砂浆内部热效应减弱,延缓了凝结时间;早期强度也损失显著,0℃时,砂浆养护1 d才形成强度,说明低温环境大大减慢了体系的固化速度。微观分析表明低温养护导致砂浆内部结构疏松,裂缝及孔隙增多,说明固化反应不完全,从而降低了砂浆的性能。当养护温度为20℃时,砂浆内部结构较为致密,宏观结构也表现出较高强度。Epoxy resin based mortar is a new high-performance engineering material.In order to study the effect of low temperature curing conditions on the working performance and early mechanical properties of epoxy resin based mortar,a low-temperature environment was constructed using a low temperature test system.The compressive strength,flexural strength,flowability,setting time,and internal temperature were tested,and the microstructure and pore structure of epoxy resin based mortar were analyzed.The results show that the performance of epoxy resin based mortar is greatly affected by temperature.When the temperature is 0℃,the fluidity is only 112 mm,but it increases rapidly with increasing temperature.Low temperature curing weakens the internal thermal effect of mortar and delays the setting time.The early strength loss is also significant.At 0℃,the mortar is cured for 1 d to form strength,indicating that the low-temperature environment greatly delays the curing rate of the system.Microscopic analysis shows that low-temperature curing leads to loose internal structure,increases cracks and pores in the mortar,indicating incomplete curing reaction and thus reducing the performance of the mortar.When the curing temperature is 20℃,the internal structure is relatively dense and the macro structure also exhibits high strength.

关 键 词：环氧树脂基砂浆 快速修补材料 低温养护 早期力学性能 工作性能 微观结构 

分 类 号：TV432.8[水利工程—水工结构工程]