某机械厂排架柱混凝土电化学再碱化技术的应用研究  

Study on Application of Electrochemical Realkalization Technology to Bent Column Concrete in a Machinery Plant

作　　者：丁云飞 张金仁 薛宇 邓祥 蒋卓洵 毛江鸿 DING Yunfei;ZHANG Jinren;XUE Yu;DENG Xiang;JIANG Zhuoxun;MAO Jianghong(College of Civil Engineering and Architecture,Henan University of Technology,Zhengzhou 450001,Henan,China;China Construction Third Bureau First Co.,Ltd.,Wuhan 430064,Hubei,China;College of Architecture and Environment,Sichuan University,Chengdu 615100,Sichuan,China)

机构地区：[1]河南工业大学土木建筑学院,河南郑州450001 [2]中建三局第一建设工程有限责任公司,湖北武汉430064 [3]四川大学建筑与环境学院,四川成都615100

出　　处：《建筑施工》2023年第11期2351-2355,共5页Building Construction

摘　　要：为了对混凝土电化学再碱化技术现场应用效果进行深入研究,选取四川省彭州市某机械厂混凝土柱作为试验对象,跟踪检测再碱化通电修复全过程,从碳化深度、混凝土强度、pH值、腐蚀电位等四方面分析评估再碱化修复效果。结果表明,再碱化的通电修复可分为3个阶段,各阶段电阻率逐级下降,第Ⅲ阶段的电阻约为第Ⅰ阶段的70%;再碱化处理后钢筋附近护层碱性增强,钢筋附近混凝土的p H值加了1.3,钢筋的腐蚀风险显著降低,钢筋再碱化后均能提升至无锈蚀活动状态,且被修复前钢筋的腐蚀情况越严重,修复效果越显著,最大腐蚀电位可从修复前的-346 mV提升到-81 mV。In order to deeply study the field application effect of electrochemical realkalization technology for concrete,the concrete column of a machinery factory in Pengzhou City,Sichuan Province was selected as the test object,the whole process of realkalization electrification repair was tracked and detected,and the realkalization repair effect was analyzed and evaluated from four aspects of carbonation depth,concrete strength,pH value and corrosion potential.The results show that the electrical repair of realkalization can be divided into three stages,and the resistivity of each stage decreases step by step.The resistance of the third stage is about 70%of that of the first stage;After the realkalization treatment,the alkalinity of the protective layer near the steel bar is increased,and the pH value of the concrete near the steel bar is increased by 1.3,thus the corrosion risk of the steel bars is significantly reduced.After the realkalization treatment,the corrosion risk of the steel bars can be increased to the state of no corrosion activity,before being repair,the more serious the corrosion of steel bars,the more significant the repair effect,and the maximum corrosion potential can be increased from-346 mV to-81 mV.

关 键 词：再碱化技术 碳化 腐蚀电位 耐久性 

分 类 号：TU765[建筑科学—建筑技术科学]