标题：
Reinforcement corrosion research based on the linear polarization resistance method for coral aggregate seawater concrete in a marine environment
点击次数：
所属单位：
航空学院
发表刊物：
ANTI-CORROSION METHODS AND MATERIALS
关键字：
Coral aggregate seawater concrete
摘要：
Purpose - This paper aims to reduce the cost, limit the time and increase raw material source availability, coral aggregate seawater concrete (CASC) composed of coral, coral sand, seawater and cement can be widely used for the construction of ports, levees, airports and roads to achieve practical engineering values. However, the naturally porous coral structure and abundant Cl- in the seawater and coral lead to extremely severe reinforcement corrosion for CASC. It is well known that Cl- is the main cause of reinforcement corrosion in the marine environment. Therefore, it is necessary to research the reinforcement corrosion of CASC in the marine environment. Design/methodology/approach - In this study, linear polarization resistance was adopted to test the linear polarization curves of reinforcement in CASC with different exposure times. E-corr, R-p, I-corr and V-corr, were calculated according to the weak electrochemical polarization theory and Stern-Geary formula. The effects of concrete cover thickness, exposure time, reinforcement types and inhibitor on reinforcement corrosion in CASC were analysed. The reinforcement corrosion degradation rule was determined, which provided theoretical support for the durability improvement, security assessment, service life prediction and service quality control of CASC structures in marine islands and reef engineering. Findings - The corrosion resistance was enhanced with increased concrete cover thickness, and the concrete cover thickness for organic new coated steel should be at least 5.5 cm to reduce the reinforcement corrosion risks in CASC structures. The corrosion resistance of different types of reinforcements followed the rule: 2205 duplex stainless steel > 316 stainless steel > organic new coated steel > zinc-chromium coated steel > common steel. In the early exposure stage, the anti-corrosion effectiveness of the calcium nitrate inhibitor (CN) was superior to that for the amino alcohol inhibitor (AA). With the extension of exposure time, the decreasing rate of anticorrosion effectiveness of CN was higher than that of AA. Originality/value - Reinforcement corrosion of CASC in a marine environment was studied. Concrete cover thickness, exposure time, reinforcement type and inhibitor influenced the reinforcement corrosion were investigated. New technique of reinforcement anti-corrosion in marine engineering was proposed. Possible applications of CASC in marine engineering structures were suggested.
ISSN号：
0003-5599
是否译文：
否
发表时间：
2018-01-01
合写作者：
余红发,麻海燕,Wu, Zhangyu
通讯作者：
达波,余红发
发表时间：
2018-01-01
学位：工学博士学位
所在单位：民航学院/飞行学院