高寒地区水工建筑物环氧砂浆防护材料耐候性能及工程应用  

Weather Resistance and Engineering Application of Epoxy Mortar Protective Materials for Hydraulic Structure in Alpine Regions

作　　者：邵晓妹 陈亮[2] 孙正[2] 周璐 李娟 曾大文[1] SHAO Xiao-mei;CHEN Liang;SUN Zheng;ZHOU Lu;LI Juan;ZENG Da-wen(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan Changjiang Kechuang Science and Technology Development Co.,Ltd.,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]长江科学院武汉长江科创科技发展有限公司,武汉430010

出　　处：《长江科学院院报》2024年第7期158-162,167,共6页Journal of Changjiang River Scientific Research Institute

基　　金：水利部重大科技项目(SKS-2022106);水利技术示范项目(SF-202301)。

摘　　要：高寒地区水工建筑物长期暴露在高海拔、强紫外辐射、冬季严寒且温差大等特殊环境下,较其他地区更易产生裂缝、渗漏破坏,以及冻融破坏、溶蚀、碳化、钢筋锈蚀、冲刷破坏等劣化问题,严重影响工程安全运行。通过室内紫外湿热老化、冻融循环,以及西藏地区自然老化等试验,研究了环氧砂浆的耐候性能。结果表明,改性环氧砂浆紫外线与湿热加速老化2000 h均未出现开裂,且抗拉强度保留率74%;抗冻等级可达到F250;自然老化960 d后,涂层颜色轻微变色,表面不粉化。该材料用于西藏拉洛水利枢纽工程泄洪洞消力池表面防护与修复,经过4 a以上服役,改性环氧砂浆抗冻、耐紫外线等耐候性能表现优异,有良好应用潜力,可为高寒地区类似工程应用提供参考。In high-altitude,cold regions,hydraulic structures endure prolonged exposure to intense ultraviolet radiation,extreme temperatures,and freeze-thaw cycles.Consequently,they are more susceptible to cracking,leakage,and deterioration from freeze-thaw cycles,corrosion,carbonation,steel erosion,and other factors compared to lower-altitude regions,significantly compromising project safety.To address this challenge,we investigated the weathering resistance of epoxy mortar through indoor UV wet heat aging,freeze-thaw cycles,and natural aging in Xizang autonomous region.Results revealed that the modified epoxy mortar exhibited resilience,with no cracking observed after 2000 hours of accelerated UV and wet heat aging,retaining a tensile strength of 74%.Moreover,it attained a frost resistance grade of F250.After 960 days of natural aging,minimal color change and no surface powdering were observed.This material was utilized for surface protection and repair in the spillway tunnel stilling pool of the Laluo Water Conservancy Project in Xizang autonomous region.Over four years of service,the modified epoxy mortar demonstrated exceptional resistance to freezing,ultraviolet exposure,and weathering,showcasing promising application prospects for similar projects in high-altitude and cold regions.

关 键 词：环氧砂浆 耐候性能 水工建筑物 高寒地区 工程应用 

分 类 号：TV431[水利工程—水工结构工程]