辐照-干湿-氯盐耦合作用下硅烷浸渍混凝土性能演变规律  

Performance Evolution Law of Silane-Impregnated Concrete under Coupling Effect of Irradiation-Wet/Dry Cycling-Chloride

作　　者：马金良 胡娟 汪伟 鞠志成 杨海成[2,3] 范志宏 MA Jinliang;HU Juan;WANG Wei;JU Zhicheng;YANG Haicheng;FAN Zhihong(China Road&Bridge Corporation,Beijing 100011,China;Key Laboratory of Harbor&Marine Structure Durability Technology,Ministry of Transport of PRC,CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Key Laboratory of Construction Material,CCCC,Guangzhou 510230,China)

机构地区：[1]中国路桥工程有限责任公司,北京100011 [2]中交四航工程研究院有限公司,水工构造物耐久性技术交通行业重点实验室,广州510230 [3]中交集团建筑材料重点实验室,广州510230

出　　处：《硅酸盐通报》2025年第1期142-150,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2022YFB2603000);中国路桥工程有限责任公司科技研发项目(P2220452)。

摘　　要：为阐明典型恶劣海洋环境对硅烷浸渍混凝土性能演变的影响,设计了浸泡、普通干湿、辐照干湿3种不同的典型海洋环境模拟实验,环境作用90、180 d后开展了接触角、吸水率、烷基含量、氯离子含量等试验。结果表明,硅烷浸渍混凝土性能演变与腐蚀环境及作用时间紧密相关。典型海洋环境作用均会导致硅烷逐渐失效破坏,新浸渍混凝土接触角为97.0°,浸泡、普通干湿、辐照干湿作用180 d后,分别降低至73.1°、46.4°、28.2°,混凝土表层1 mm处的烷基含量均低于2 mm处。与浸泡相比,短期辐照干湿作用降低了混凝土表层孔隙的含水量,加速了硅烷脱水缩合反应进程,有利于降低硅烷浸渍混凝土早期吸水率,提升早期抗氯离子侵蚀能力,辐照干湿组90 d吸水率、氯离子扩散系数均最低。但随辐照干湿作用时间延长,硅烷劣化加速,辐照干湿组180 d吸水率、氯离子扩散系数均显著增加。In order to clarify the influences of typical harsh marine environments on the performance evolution of silane-impregnated concrete,three different simulated environmental experiments were designed,including immersion,ordinary wet/dry cycling,and irradiation wet/dry cycling.After exposure to these environments for 90 and 180 d,experiments on contact angle,water absorption ratio,alkyl content and chloride content were carried out.The results indicate that the performance evolution of silane-impregnated concrete is closely related to the exposure environment and the action time.The silane gradually fails and destroys in the typical marine environments.The initial contact angle of freshly impregnated concrete is 97.0°,which decreases to 73.1°,46.4°,28.2°after 180 d of immersion,ordinary wet/dry cycling,and irradiation wet/dry cycling,respectively.The alkyl content at 1 mm of silane-impregnated concrete is lower than that at 2 mm.Compared with immersion,short-term irradiation wet/dry cycling reduces the water content in surface pores of concrete,facilitating the dehydration condensation reaction of silane,reducing the early water absorption ratio and improving the chloride resistance of silane-impregnated concrete.Specifically,the irradiation wet/dry cycling group exhibits the lowest water absorption ratio and chloride diffusion coefficient at 90 d.However,with the extension of irradiation wet/dry cycling,the degradation of silane accelerates,and the water absorption ratio and chloride diffusion coefficient at 180 d both increase significantly.

关 键 词：硅烷浸渍混凝土 辐照 干湿 烷基含量 氯离子扩散系数 

分 类 号：TU528.33[建筑科学—建筑技术科学]