Abstract: It is universally known that concrete would crack when expansion stress induced by corrosion of reinforcing bar exceeds the tensile strength of concrete. And directly measuring the corrosion stress of rebar contributes to predicting the cracking time of concrete. In this paper, acce-lerated corrosion of reinforced concrete was carried out by constant potential corrosion and seawater penetration. The digital image correlation (DIC) was employed to test the surface strain of concrete, and the hollow reinforcing bar was adopted to test its internal surface strain. And the corroding stress model of reinforcing bar was derived based on the elastic mechanics theory. The results indicated that DIC and hollow reinforcing bar were effective for measuring the surface strain evolution of concrete and reinforcing bar. It could be observed by DIC that there was stress concentration on the groove edge of the concrete surface. And compressive stress occurred on the upper surface of the reinforcing bar, which leaded to the cracking of concrete cover. The constant potential accelerated corrosion with seawater penetration caused the non-uniform corrosion of the reinforcing bar in the concrete, resulting in the cracking of concrete at the corrosion stress of 3 MPa, and corrosion duration of 25 h.
作者简介: 王潇舷,2016年6月毕业于成都理工大学环境与土木工程学院,获得管理学士学位。2018年12月毕业于青岛理工大学,获得工程硕士学位。现在为东南大学材料科学与工程学院博士研究生。硕士研究生期间在金祖权教授的指导下进行研究,主要研究领域为海洋环境混凝土结构耐久性。 金祖权,青岛理工大学土木工程学院教授,博士研究生导师。1998年6月毕业于焦作工学院。2003年6月毕业于河南理工大学,获得工学硕士学位。2006年6月毕业于东南大学,获得工学博士学位。2009年-2011年在中科院海洋研究所从事博士后研究工作。2014-2015年在英国伦敦大学学院访学,曾获“霍英东青年教师奖”。主要从事海洋环境混凝土耐久性以及高性能混凝土制备技术的研究。近年来在混凝土材料及结构领域发表论文50余篇,包括 《硅酸盐学报》、Cement and Concrete Research、Construction and Building Materials、Corrosion Science和 Journal of Advanced Concrete Technology等。
引用本文:
王潇舷, 金祖权, 姜玉丹, 陈凡秀. 基于DIC与应变测试的混凝土中钢筋锈胀应力分析[J]. 材料导报, 2019, 33(16): 2690-2696.
WANG Xiaoxian, JIN Zuquan, JIANG Yudan, CHEN Fanxiu. Analysis of Stress in Concrete Induced by Corrosion of Reinforcing Bar Based on DIC and Strain Test. Materials Reports, 2019, 33(16): 2690-2696.
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2019, Vol. 33 
