阻锈剂的掺入方式对全珊瑚海水混凝土中钢筋锈蚀的影响

doi:10.11902/1005.4537.2018.040

中国腐蚀与防护学报

2019, Vol. 39

Issue (2): 152-159 DOI: 10.11902/1005.4537.2018.040

研究报告

本期目录 | 过刊浏览

阻锈剂的掺入方式对全珊瑚海水混凝土中钢筋锈蚀的影响

达波,余红发(

),麻海燕,吴彰钰

南京航空航天大学土木工程系南京 210016

Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete

Bo DA,Hongfa YU(

),Haiyan MA,Zhangyu WU

Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

全文: PDF(3225 KB) HTML

摘要:

采用线性极化电阻法 (LPR) 和电化学阻抗谱法 (EIS)，系统研究了暴露时间、阻锈剂种类及掺入方式对全珊瑚海水混凝土 (CASC) 中钢筋腐蚀的影响。结果表明：随着暴露时间的延长，不掺及同掺阻锈剂的普通钢筋自腐蚀电位 (E_corr)、极化电阻 (R_p) 和电荷转移电阻 (R_ct) 均逐渐降低；而暴露90 d后，预吸阻锈剂的普通钢筋E_corr、R_p和R_ct均有增长的趋势，说明以预吸掺入的阻锈剂，不断地由珊瑚骨料向外释放，使得混凝土中有效的阻锈成分不断补充，一定程度上增大了Cl^-通过混凝土传到钢筋表面的阻力，延缓了钢筋的锈蚀。此外，无论是掺入亚硝酸钙阻锈剂 (CN) 还是氨基醇类阻锈剂 (AA)，对普通钢筋抵抗锈蚀的能力均有不同程度的提高，且随着暴露时间的延长，CN阻锈效果的衰减速率高于AA的。因此，对于海洋岛礁工程中的CASC结构，建议以预吸的方式掺入AA，有利于减弱钢筋对Cl^-腐蚀的敏感性，提高CASC抗Cl^-扩散渗透能力，从而延缓钢筋开始腐蚀时间，降低锈蚀的速率，达到延长CASC结构服役寿命的目的。

关键词 ：全珊瑚海水混凝土, 钢筋锈蚀, 线性极化电阻法, 电化学阻抗谱法, 阻锈剂, 掺入方式

Abstract：

The effect of inhibitors on corrosion behavior of reinforced bar in coral aggregate seawater concrete (CASC) in artificial sea water was studied by means of linear polarization resistance method (LPR) and electrochemical impedance spectroscopy (EIS). Two inhibitors, calcium nitrite rust inhibitor (CN) and amino-alcohol rust inhibitor (AA) are concerned, while two ways are adopted for mixing inhibitor into the concrete, namely, the inhibitor was directly dissolved into the seawater (ordinary way) and absorbed onto the coral aggregate (pre-absorbed way). The results show that for CASC concretes without and with inhibitor added via ordinary way, E_corr, R_p and R_ct decreased with the extension of the exposure time, but for those with the pre-absorbed inhibitor, E_corr, R_p and R_ct has a grown trend when exposure for 90 d, demonstrating that the pre-absorbed inhibitor onto the aggregate would gradually and continuously be released into the concrete to increase its barrier effect to the migration of harmful Cl^-, therewith to alleviate the corrosion of the reinforced bar. Besides, the addition of CN or AA could enhance the corrosion resistance of the reinforcement bar, however the degradation rate of anticorrosion effectiveness of CN was higher than that of AA. Therefore, for marine engineering structures made of CASC on islands and reefs, it was suggested to adopt the pre-absorbed AA, which could prolong the time for the corrosion initiation of reinforced bar, reduce the corrosion rate and prolong the service life of the CASC structures.

Key words： coral aggregate seawater concrete reinforced bar corrosion linear polarization resistance method electrochemical impedance spectroscopy method inhibitor adding mode

收稿日期: 2018-04-01

ZTFLH:

TU528

基金资助:国家自然科学基金(51508272);国家自然科学基金(51678304);国家自然科学基金(51878350);国家自然科学基金(11832013);江苏省自然科学基金(BK20180433);中国博士后科学基金(2018M630558)

通讯作者: 余红发 E-mail: yuhongfa@nuaa.edu.cn

Corresponding author: Hongfa YU E-mail: yuhongfa@nuaa.edu.cn

作者简介: 第一达波，男，1988年生，博士

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引用本文:

达波,余红发,麻海燕,吴彰钰. 阻锈剂的掺入方式对全珊瑚海水混凝土中钢筋锈蚀的影响[J]. 中国腐蚀与防护学报, 2019, 39(2): 152-159.
Bo DA, Hongfa YU, Haiyan MA, Zhangyu WU. Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 152-159.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.040 或 https://www.jcscp.org/CN/Y2019/V39/I2/152

表1 珊瑚骨料的物理性质

表2 CASC试件编号

图1 CASC试块示意图

图2 CASC的电化学测试示意图

图3 阻锈剂种类及掺入方式对CASC中普通钢筋Ecorr的影响

图4 阻锈剂种类及掺入方式对CASC中普通钢筋线性极化曲线的影响

图5 阻锈剂种类及掺入方式对CASC中普通钢筋Rp的影响

图6 钢筋CASC梁中普通钢筋的表面腐蚀状态

图7 阻锈剂种类及掺入方式对CASC中普通钢筋电化学阻抗谱的影响

表3 采用不同方法掺入不同种类阻锈剂的CASC中普通钢筋的Rct

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