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2 000 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。
Abstract
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
Key words
epoxy mortar /
weather resistance /
hydraulic structure /
alpine regions /
engineering application
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参考文献
[1] 张振忠, 陈 亮, 汪在芹, 等. 水工泄水建筑物抗冲磨材料发展现状[J]. 化工新型材料, 2016, 44(10): 230-232. (ZHANG Zhen-zhong, CHEN Liang, WANG Zai-qin, et al. Development of Abrasion Resistant Material for Hydraulic Discharge Structure[J]. New Chemical Materials, 2016, 44(10): 230-232.(in Chinese))
[2] 陈国新, 祝烨然, 杜志芹, 等. 塑钢纤维对水工抗冲磨混凝土性能的影响研究[J]. 混凝土, 2011(5): 47-49. (CHEN Guo-xin, ZHU Ye-ran, DU Zhi-qin, et al. Study on Macro Fibre of Hydraulic Concrete[J]. Concrete, 2011(5): 47-49.(in Chinese))
[3] 董 芸, 杨华全, 肖开涛, 等. 不同骨料对抗冲耐磨混凝土性能的影响[J]. 混凝土, 2013(12): 82-86. (DONG Yun, YANG Hua-quan, XIAO Kai-tao, et al. Effect of Aggregate on Performance of Abrasion Resistance Concrete[J]. Concrete, 2013(12): 82-86.(in Chinese))
[4] 管惠领.HF高强耐磨混凝土配合比设计及其应用[J].华北水利水电学院学报,2011,32(6):51-54.(GUAN Hui-ling.Mixture Ratio Design of the HF Anti-abrasion Concrete with High Strength and Its Application[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power,2011,32(6):51-54.(in Chinese))
[5] 徐雪峰,白 银,余 熠.水工泄水建筑物抗冲耐磨高分子护面材料综述[J].人民长江,2012,43(增刊1):177-179,198.(XU Xue-feng, BAI Yin, YU Yi. Summary of Impact-resistant and Wear-resistant Polymer Facing Materials for Hydraulic Discharge Structures[J]. Yangtze River, 2012, 43(Supp.1): 177-179, 198.(in Chinese))
[6] 杨伟才,郝巨涛.“海岛结构”环氧砂浆抗冲磨性能试验研究[J].中国水利水电科学研究院学报,2006,4(4):298-303.(YANG Wei-cai, HAO Ju-tao. Abrasion Resistance Tests on “Sea Island Structure” Epoxy Mortar[J]. Journal of China Institute of Water Resources and Hydropower Research, 2006, 4(4): 298-303.(in Chinese))
[7] 邵晓妹,范冬冬,马保国,等.CW弹性环氧砂浆抗冲磨性能及工程应用[J].raybet体育在线
院报,2020,37(6):166-170.(SHAO Xiao-mei,FAN Dong-dong,MA Bao-guo,et al. Anti-abrasion Property of CW Elastic Epoxy Mortar and Engineering Applications[J]. Journal of Yangtze River Scientific Research Institute, 2020, 37(6): 166-170.(in Chinese))
[8] 万雄卫,李北星,闵四海,等.JME改性环氧砂浆抗冲磨修补材料的研究与应用[J].施工技术,2007,36(5):94-96.(WAN Xiong-wei, LI Bei-xing, MIN Si-hai, et al. Study and Application of JME Modified Epoxy Mortar Erosion and Abrasion Resistant Materials[J]. Construction Technology, 2007, 36(5): 94-96.(in Chinese))
[9] 买淑芳,陈肖蕾,姚 斌.环氧砂浆涂层老化状况研究与弹性环氧材料的开发[J].大坝与安全,2004(5):20-23.(MAI Shu-fang,CHEN Xiao-lei,YAO Bin.A Research on Aging Effects of Epoxy Mortar Coating and Elastic Epoxy Material[J]. Large Dam and Safety, 2004(5): 20-23.(in Chinese))
基金
水利部重大科技项目(SKS -2022106);水利技术示范项目(SF-202301)
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