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为研究混杂纤维混凝土与锈蚀钢筋粘结性的关系,通过电化学加速锈蚀,获取4组不同钢筋锈蚀率(0~6.89%)的钢—聚乙烯醇纤维混凝土试件。采用中心拉拔试验,得到不同锈蚀率情况下钢筋与混杂纤维混凝土的粘结强度,分析锈蚀率、混杂纤维体积率对钢筋与混凝土粘结性能的影响,并根据试验结果提出了混杂纤维混凝土粘结强度系数和滑移值系数与钢筋锈蚀率之间的数学关系式。结果表明,在一定范围内混杂纤维体积率越大,钢筋与混凝土之间的粘结性能越好,粘结强度随着锈蚀率的升高呈现先增加后下降的趋势。
In order to study the relationship between the hybrid fiber reinforced concrete and the adhesion of corroded steel bar, four groups of steel-polyvinyl alcohol fiber reinforced concrete specimens with different reinforcement corrosion rates (0 ~ 6.89%) were obtained by electrochemical corrosion acceleration. The center pull test was used to obtain the bond strength between steel bar and hybrid fiber reinforced concrete under different corrosion rates. The influence of corrosion rate and mixed fiber volume ratio on the bond performance between steel bar and concrete was analyzed. According to the test results, the hybrid fiber concrete viscosity Mathematical relation between knot strength coefficient and slip value coefficient and reinforcement corrosion rate. The results show that the larger the volume fraction of hybrid fiber in a certain range, the better the bond between steel bar and concrete. The bond strength first increases and then decreases with the increase of corrosion rate.