表面防水混凝土在冻融环境下抗氯离子侵蚀性能研究  

Chloride penetration behavior of surface water-proofing concrete under freeze-thaw environment

作　　者：王喜彬[1] 张进[1] 马志鸣[2] 管庭 

机构地区：[1]中原工学院建筑工程学院,河南郑州450007 [2]青岛理工大学土木工程学院,山东青岛266033

出　　处：《混凝土》2016年第7期57-60,共4页Concrete

基　　金：国家重点基础研究发展项目(973计划)(2009CB623203)

摘　　要：氯离子侵蚀是造成混凝土内部钢筋锈蚀,混凝土结构发生耐久性破坏的主要原因。研究冻融损伤对表面防水混凝土抗氯离子渗透性的影响,分别对不同水灰比的普通混凝土和表明防水混凝土开展加速冻融循环试验和氯离子侵蚀试验。试验结果表面,随着冻融循环次数的增加表面防水混凝土的抗氯离子渗透性能降低,氯离子侵入量和氯离子扩散系数急剧增加;但是在相同冻融循环次数下,表面防水混凝土仍较普通混凝土具有更好的抗氯离子渗透性能;对于严寒环境下,对混凝土结构进行表面防水处理是提其抗氯离子侵蚀能力并延长其耐久性的有效方法。Chloride penetration is the main reason that causes the rebar corrosion and durability damage in reinforced concrete.It aims to investigate the influence of freeze-thaw damage on the chloride penetration behavior of surface water-proofing concrete.The ordinary and surface water-proofing concrete specimens were first prepared,and then the accelerated freeze-thaw and chloride penetrates tests were car-ried out.The result shows that the chloride resistance decreases with the increase of freeze-thaw cycles.The amount of chloride penetration and chloride diffusion coefficient increase with the increasing freeze-thaw cycles.However,the surface water-proofing concrete possesses a better resistance to chloride penetration than the ordinary concrete under the same freeze-thaw environment.The processing technology of surface water-proofing is appropriate forthe concrete structureunder the frost environment.

关 键 词：氯离子侵蚀 冻融损伤 表面防水混凝土 耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]