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根据钢筋混凝土梁锈胀开裂的特点,考虑钢筋锈蚀不均匀性,对锈胀裂缝宽度实测值进行修正。结合对钢筋锈蚀开裂后锈蚀物体积膨胀的量化分析,得到了混凝土开裂后的钢筋锈蚀率基于锈胀裂缝宽度的计算模型,并通过电解液加速锈蚀方法对配筋混凝土试块进行加速腐蚀试验,拟合出了实用的锈蚀率计算式。采用7根钢筋混凝土梁的电解液加速腐蚀试验进行验证。结果表明:锈胀裂缝宽度与钢筋锈蚀率近似呈线性变化;在钢筋不均匀锈蚀的情况下,采用间接法计算得到的钢筋最大锈蚀率与试验平均锈蚀率的比值在1.4～2.4之间,与实际情况符合较好。
According to the characteristics of corrosion cracking of reinforced concrete beam, considering the corrosion unevenness of steel bars, the measured value of the width of corrosion crack is corrected. Based on the quantitative analysis of the corrosive volume expansion after corroded cracking, the calculation model of corroded corrosion rate of concrete after cracking was obtained based on the width of corrosive crack. Accelerated corrosion test of reinforced concrete test block was carried out by electrolytic corrosion accelerated method. Fitting a practical formula for calculating the corrosion rate. Using seven reinforced concrete beams accelerated corrosion test to verify. The results show that the width of corrosion crack and the corrosion rate of steel bar change approximately linearly. The ratio of the maximum corrosion rate to the average corrosion rate of steel bar calculated by indirect method is between 1.4 and 2.4 in the case of uneven corrosion of steel bar. The actual situation in line with better.