低温环境环氧树脂预固化对修补混凝土湿裂缝性能影响  

Effects of epoxy resin pre-curing in low-temperature environments on the repair performance of wet cracks in concrete

作　　者：畅海峰 杨林 赵旗 张应飞 卫海涛 朱永和 CHANG Haifeng;YANG Lin;ZHAO Qi;ZHANG Yingfei;WEI Haitao;ZHU Yonghe(Luoyang Nongfa Yellow River Water Conservancy Construction and Development Co.,Ltd.,Luoyang 471000,China;Jianghe Anlan Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;National Center for Quality Supervision and Test of Hydraulic Engineering,Zhengzhou 450003,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]洛阳农发黄河水利建设开发有限公司,河南洛阳471000 [2]江河安澜工程咨询有限公司,河南郑州450003 [3]国家水利工程质量检验检测中心,河南郑州450003 [4]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《水利水运工程学报》2025年第2期112-120,共9页Hydro-Science and Engineering

基　　金：国家重点研发计划项目(2019YFC1509905);中国博士后基金面上项目(2022M711286);河南省重点研发与推广专项(232102230133)。

摘　　要：水工混凝土开裂常伴随渗漏水现象,裂缝灌浆修补一般选择在低温季节施工。为探究低温环境长时间灌浆时环氧树脂预固化对湿裂缝修补效果的影响,采用低温预反应方法模拟灌浆桶中环氧树脂固化过程,研究预固化对浆液性能、固化物性能、修补混凝土性能和微观结构的影响。结果表明:低温预固化后,浆液反应温升可降低38.0℃,固化物收缩率可降低12.0%,固化物抗压和抗拉强度分别增长2.8%和8.9%;修补混凝土湿黏结和劈裂抗拉强度最高增长34.3%和46.9%,破坏形态由缝面断裂变为基体断裂,抗压强度恢复率可达100%。扫描电镜结果显示:低温预固化环氧树脂固化物微观缺陷减少,致密性和均匀性得到明显改善。因此,低温环境修补混凝土湿裂缝时,适当降低灌浆速率、延长灌浆时间,有利于改善混凝土湿裂缝修补效果。Cracking in hydraulic concrete is often accompanied by water leakage,and crack grouting repairs are typically performed during low-temperature seasons.To investigate the effect of epoxy resin pre-curing under prolonged grouting conditions in low-temperature environments on the repair efficiency of wet cracks,a lowtemperature pre-reaction method was used to simulate the curing process of epoxy resin in a grouting container.The effects of pre-curing on slurry properties,cured material properties,repaired concrete performance,and microstructure were studied.Results indicate that after low-temperature pre-curing,the exothermic temperature rise of the slurry decreased by 38.0%,and the shrinkage rate of the cured material reduced by 12.0%.Additionally,the compressive and tensile strengths of the cured material increased by 2.8%and 8.9%,respectively.For repaired concrete,the wet bond strength and splitting tensile strength improved by up to 34.3%and 46.9%,respectively,with failure modes shifting from crack surface fractures to substrate fractures.Compressive strength recovery reached 100%.Scanning electron microscopy revealed that the microdefects in the cured epoxy resin were significantly reduced,and the density and uniformity were markedly enhanced.Therefore,in low-temperature environments,lowering the grouting rate and extending the grouting duration can effectively improve the repair performance of wet cracks in concrete.

关 键 词：低温环境 环氧树脂 预固化 湿裂缝 修补性能 

分 类 号：TV543.6[水利工程—水利水电工程]