非离子型表面活性剂对盐侵碳化后混凝土中钢筋的阻锈效果  

Anti-rust effect of non-ionic surfactant on reinforcement in concrete after salt intrusion and carbonation

作　　者：徐滨 周文凯 李刚雷 XU Bin;ZHOU Wenkai;LI Ganglei(College of Architecture and Design Art,Shaoxing Vocational and Technical College,Shaoxing 312000,China;China Construction Eighth Engineering Division Rail Transit Construction Co.,Ltd.,Nanjing 210046,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]绍兴职业技术学院建筑与设计艺术学院,浙江绍兴312000 [2]中建八局轨道交通建设有限公司,江苏南京210046 [3]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《混凝土》2023年第9期101-104,115,共5页Concrete

基　　金：国家自然科学基金(52108170)。

摘　　要：为研究非离子型表面活性剂(PPD)对盐侵、碳化后混凝土钢筋的阻锈效果,开展了混凝土模拟孔隙液中钢筋的电化学试验。结果表明:PPD对钢筋阻锈效果对其浓度具有较高依赖性:随浓度增加,钢筋电化学行为出现激发-抑制-再激发;当浓度为30 mg/L时,模拟液-钢筋界面的阻抗最大,腐蚀电流最小,PPD阻蚀效率最高,且钢筋表面始终保持平整、光滑,无点蚀孔;浓度过低,吸附力弱,无法形成致密保护膜;而浓度过高,分子间排斥力增大,吸附力减弱,且易激发络合反应和电池反应,加速钢筋腐蚀。In order to study the anti-rust effect of non-ionic surfactant(PPD)on concrete reinforcement after salt intrusion and carbonation,the electrochemical test of reinforcement in concrete simulated pore fluid was carried out.The results show that the corrosion inhibition effect of PPD on reinforcement is strongly dependent on its concentration,with the increase of concentration,the electrochemical behavior of reinforcement appears excitation-suppression-reactivation.When the concentration is 30 mg/L,the impedance of the simulated liquid-reinforcement interface is the largest,the corrosion current is the smallest,the PPD corrosion resistance efficiency is the highest,and the reinforcement surface is always flat and smooth,without pitting holes.The concentration is too low,the adsorption is weak,and the dense protective film cannot be formed.However,if the concentration is too high,the intermolecular repulsion force increases,the adsorption force decreases,and it is easy to stimulate the complexation reaction and battery reaction,thus accelerating the corrosion of reinforcement.

关 键 词：非离子型表面活性剂 Cl-腐蚀 碳化 吸附作用 钢筋阻锈 浓度敏感性 

分 类 号：TU528.042[建筑科学—建筑技术科学]