引气混凝土抗冻性及抗氯离子渗透性试验研究  

Experimental study on the frost resistance and chloride penetration resistance of air-entrained concrete

作　　者：袁春坤 闫博宸 王元战[2] 程天麒 YUAN Chun-kun;YAN Bo-chen;WANG Yuan-zhan;CHENG Tian-qi(China Road and Bridge Corporation, Beijing 100011, China;State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University,Tianjin 300072, China)

机构地区：[1]中国路桥工程有限责任公司,北京100011 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《水道港口》2020年第5期590-597,共8页Journal of Waterway and Harbor

基　　金：国家重点研发计划(2016YFC0802204,2016YFC0802201);国家自然科学基金(51679166);国家自然科学基金创新研究群体科学基金(51321065);交通运输部交通建设科技项目(2014328224040)。

摘　　要：冻融循环和氯离子侵蚀是造成寒冷地区暴露于海洋环境中的钢筋混凝土结构耐久性失效的主要原因。在混凝土中添加引气剂,可以改善混凝土的抗冻性,但引气剂的掺入也会对混凝土的抗氯离子渗透性产生影响。对含气量分别为0.8%、2.7%、4.5%、6.6%的混凝土试件开展冻融循环试验和模拟海洋潮汐环境中的氯离子自然扩散试验,研究含气量对混凝土抗冻性和抗氯离子渗透性的影响,分析了引气混凝土抗冻性和抗氯离子渗透性随含气量的变化规律,确定了使混凝土同时具有较好抗冻性和抗氯离子渗透性的含气量。Freeze-thaw cycles and chloride-induced corrosion are the main causes of the durability deterioration of reinforced concrete structures exposed to the marine environment in cold areas.The frost resistance of concrete can be improved by the addition of air-entraining admixture,the resistance to the chloride penetration,however,can be decreased by its overuse.Therefore,concrete specimens with air content of 0.8%,2.7%,4.5%and 6.6%were used to investigate the effects of air content on the frost resistance and the chloride penetration resistance via the freeze-thaw cycles test and the natural diffusion test in the simulated marine environment.The results show that frost resistance and chloride penetration resistance can be described as a function of air content.The optimum of air content is also determined to achieve high resistance to the freeze-thaw cycles and chloride penetration,simultaneously.

关 键 词：混凝土 引气剂 含气量 抗冻性 抗氯离子渗透性 

分 类 号：U441[建筑科学—桥梁与隧道工程]