Evaluation on the acidification damage of the external anode mortar induced by impressed current cathodic protection
Evaluation on the acidification damage of the external anode mortar induced by impressed current cathodic protection
复制标题
外加阳极砂浆外加电流阴极保护酸化损伤评价
DOI：
10.1016/j.conbuildmat.2019.116869
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发表时间：
2019-12-30
影响因子：
7.4
通讯作者：
Yu, Qijun
中科院分区：
文献类型：
--
作者：
Hu, Jie;Wang, Yangyang;Yu, Qijun
外加电流阴极保护（ICCP）会对阳极外砂浆造成酸化破坏，影响其耐久性和使用寿命。仅在模拟孔隙溶液中对酸化效应进行了实验研究，未考虑水化产物在酸化过程中的溶解。在本研究中，ICCP处理引起的酸化损害外阳极砂浆进行了研究。结果表明，外加电流降低了砂浆中钛网的耐腐蚀性，在氯化物存在下，这种负面影响更为明显。外加电流后，钛网/二次砂浆界面Ca（OH）2含量降低，导致砂浆基体Ca/Si比降低，孔隙率增加。在此基础上，利用处理过程中的电荷量定量评价了钛网/二次砂浆界面的酸化损伤程度。(C)2019爱思唯尔有限公司版权所有。
Impressed current cathodic protection (ICCP) can cause acidification damage in the external anode mortar and influence its durability and service life. The caused acidification effect was only experimentally investigated in the simulated pore solution and the dissolution of hydration product during the process was not considered. In this study, the acidification damage induced by ICCP treatment was investigated in the external anode mortar. The results indicated that the applied current reduced the corrosion resistance of Ti mesh embedded in the mortar; this negative effect was more pronounced in the presence of chlorides. When the external current was applied, Ca(OH)(2) content at Ti mesh/secondary mortar interface decreased, leading to a lower Ca/Si ratio and increased porosity of the mortar matrix. Based on the experiment results, the acidification damage occurred at Ti mesh/secondary mortar interface was quantitatively evaluated in terms of the electric charge quantity during the treatment. (C) 2019 Elsevier Ltd. All rights reserved.