Application feasibility of HRB400 steel in seawater and marine sand concrete
Application feasibility of HRB400 steel in seawater and marine sand concrete
复制标题
DOI：
10.1002/maco.201810169
复制
发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Baihui Shang;Ying Li
中科院分区：
文献类型：
--
作者：
Baihui Shang;Ying Li
由于沿海地区淡水和河沙的短缺，有时必须使用海水和海砂来准备施工混凝土。因此，钢筋在海水和海砂混凝土中的腐蚀是不容忽视的。根据钢筋锈蚀情况，确定了HRB400钢筋在海水和海砂混凝土中应用的可行性。用电化学方法研究了HRB400钢在养护混凝土和在役混凝土中的钝化和去钝化过程，确定了形成稳定钝化膜的条件和钢筋去钝化的临界氯离子阈值。试验结果表明，HRB400钢不能直接用于海水混凝土，但由于低浓度的氯离子对钝化膜的性能没有影响，因此，当氯离子掺入浓度不超过0.05M时，HRB400钢可以用于海砂混凝土。
Due to the shortage of fresh water and river sand in coastal areas, seawater, and marine sand sometimes must be used in the preparation of concrete for construction. Thus, the corrosion of steel rebar in seawater and marine sand concrete cannot be ignored. In this study, the feasibility of using HRB400 steel in seawater and marine sand concrete was determined based on steel rebar corrosion. Electrochemical methods were used to investigate the passivation and depassivation of HRB400 steel in curing and in‐service concrete, respectively, and to determine conditions for forming a stable passive film and the critical chloride threshold for the steel depassivation. Our experimental results demonstrate that HRB400 steel cannot be directly applied in seawater concrete but may be used in marine sand concrete when the concentration of mixed‐in chloride is no more than 0.05 M because low concentrations of mixed‐in chloride had no effect on the properties of the passive film.