盐雾-烘干循环作用下钢筋混凝土腐蚀特性研究  

Study on corrosion characteristics of reinforced concrete under salt spary-drying cycle

作　　者：乔宏霞[1,2] 张璐 冯琼[1] 尚明刚 温少勇 QIAO Hongxia;ZHANG Lu;FENG Qiong;SHANG Minggang;WEN Shaoyong(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;West China Civil Engineering Disaster Prevention and Reduction EngineeringResearch Center,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《功能材料》2020年第5期5161-5167,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51468039,51868044)。

摘　　要：为研究我国西部盐渍土地区大气环境中钢筋混凝土腐蚀劣化过程及掺入不同种类矿物掺和料对其影响,采用4种不同混凝土配合比制备钢筋混凝土试件并进行盐雾-烘干加速侵蚀试验,对钢筋自腐蚀电位、腐蚀电流密度及混凝土相对动弹性模量、腐蚀形貌等耐久性相关参数加以分析。结果表明,掺入不同矿物掺合料对混凝土内部孔隙结构的改善效果及对钢筋混凝土抗腐蚀性能的提升作用由优到差依次是:粉煤灰、粉煤灰-矿粉、无矿物掺和料成分、矿粉,因此掺入粉煤灰不仅节约成本,而且提高了钢筋混凝土构件在西部环境中的服役寿命。In order to study the corrosion and deterioration process of reinforced concrete in the atmospheric environment of saline soil areas in western China and the effects of incorporation of different types of mineral admixtures,reinforced concrete pieces were prepared with four different concrete mix ratios and performed salt spray-drying accelerating corrosion test.The test analyzed the durability-related parameters such as the self-corrosion potential of the steel bar,the corrosion current density,the relative dynamic elastic modulus of the concrete,and the corrosion morphology.The results show that the effect of improving the internal pore structure of concrete and the improvement of the corrosion resistance of reinforced concrete by adding different mineral admixtures was in descending order:fly ash,fly ash-slag powder,no mineral admixture.Therefore,the addition of fly ash not only saved costs,but also increased the service life of reinforced concrete members in the western environment.

关 键 词：钢筋混凝土 盐雾-烘干循环 矿物掺和料 极化曲线 相对动弹性模量 

分 类 号：TU511[建筑科学—建筑技术科学]