Zhao Xingke, Liu Runqing, Qi Wenhan, Yang Yuanquan
School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China.
Technology R & D Department, Zhejiang Dadongwu Group Co., Ltd., Huzhou 313000, China.
Materials (Basel). 2020 Aug 17;13(16):3636. doi: 10.3390/ma13163636.
This paper aims to provide new insight into a method to improve the chloride ion corrosion resistance of steel fiber reinforced concrete. The steel fiber was pretreated by zinc phosphate before the preparation of the fiber reinforced concrete. Interfacial bond strength, micro-hardness and micro-morphology properties were respectively analyzed in the steel fiber reinforced concrete before and after the chloride corrosion cycle test. The results show that the chloride ion corrosion resistance of the steel fiber was enhanced by zinc phosphate treatment. Compared to plain steel fiber reinforced concrete under chloride ion corrosion, the interfacial bond strength of the concrete prepared by steel fiber with phosphating treatment increased by 15.4%. The thickness of the interface layer between the pretreated steel fiber and cement matrix was reduced by 50%. The micro-hardness of the weakest point in the interface area increased by 54.2%. The micro-morphology of the interface area was almost unchanged before and after the corrosion. The steel fiber reinforced concrete modified by zinc phosphate can not only maintain the stability of the microstructure when corroded by chloride ion but also presents good bearing capacity.
本文旨在为提高钢纤维增强混凝土抗氯离子腐蚀性能的方法提供新的见解。在制备纤维增强混凝土之前，对钢纤维进行了磷酸锌预处理。分别对氯离子腐蚀循环试验前后的钢纤维增强混凝土的界面粘结强度、显微硬度和微观形貌特性进行了分析。结果表明，磷酸锌处理提高了钢纤维的抗氯离子腐蚀性能。与氯离子腐蚀作用下的普通钢纤维增强混凝土相比，经磷化处理的钢纤维制备的混凝土界面粘结强度提高了15.4%。预处理钢纤维与水泥基体之间的界面层厚度减少了50%。界面区域最薄弱点的显微硬度提高了54.2%。腐蚀前后界面区域的微观形貌几乎没有变化。经磷酸锌改性的钢纤维增强混凝土不仅在氯离子腐蚀时能保持微观结构的稳定性，而且具有良好的承载能力。
