摘要
通过一系列模拟加速锈蚀钢筋正交实验及相应的物理检测和电化学检测手段,系统地研究了混凝土钢筋在不同腐蚀环境条件下的锈蚀速率。实验结果表明,螺纹钢比光圆钢筋耐蚀性更差,在相同腐蚀环境下其抗拉强度及上下屈服强度,以及延伸率的下降程度均比圆钢筋显著。其中,伸长率的变化最为明显;在没有氯离子的环境下,钢筋前期基本以均匀锈蚀为主,后期才发展为局部锈蚀,这时的力学性能指标也呈现出与锈蚀情况对应的正相关性;在严重含氯离子的环境下,初期就表现出不均匀锈蚀状况,这时的力学性能指标与锈蚀情况不再具有线性关系,而出现急速下降的趋势。失重率检测结果印证了腐蚀程度与力学性能的相关性。研究结论为今后钢筋混凝土构件全寿命设计的理论研究奠定了一个实验预研工作基础。
This paper systematically studied the corrosion rate of different shapes of steels un-der different corrosion environments through a series of accelerated corrosion test of orthogonalexperiment and the corresponding physical tests and electrochemical detection methods. The ex-perimental results show that the corrosion resistance of the deformed bar is poorer than that ofplain round bar. In the same corrosive environment, its tensile strength, yield strength and elon-gation decline are more significant than those of round steel, and the change of the elongation ismore obvious. Experimental results also show that in the environment free of chloride ion, uni-form corrosion dominates in former stage,which develops in to local corrosion in later stage, themechanical performance index also presents a corresponding positive correlation with the corro-sion situation. But the uneven corrosion condition appears at the former in the chlorine ion envi-ronment. In this condition, the mechanical performance and corrosion situation are no longer inlinear relationship, but the trend rapidly declines. Results of weight loss rate test confirm thatthe correlation of degree of corrosion and mechanical properties.
出处
《太原理工大学学报》
CAS
北大核心
2014年第6期750-753,768,共5页
Journal of Taiyuan University of Technology
基金
交通运输部重大科技项目资助:服役混凝土桥梁内部缺损无损可视化检测技术及装备研发(2011318223390)
北京市级URT项目资助(14010221077)
关键词
混凝土钢筋
钢筋锈蚀
锈蚀钢筋力学性能
concrete reinforcement
corrosion of reinforcement
corroded reinforced mechanical properties
mechanical performance degradation rule
