基于长度表征不均匀锈蚀钢筋力学性能研究

Mechanical Properties of Non-uniformly Corroded Steel Bars Based on Length Characterization

为研究锈蚀钢筋沿长度方向的锈蚀率变化规律及其对锈蚀钢筋力学性能的影响,对混凝土板中钢筋进行了电化学加速锈蚀试验.结果表明:通过控制混凝土密实度及浸泡方式,采用电化学加速锈蚀试验,可以得到沿截面及长度方向不均匀锈蚀的钢筋.锈蚀钢筋屈服荷载、极限荷载与微段最大锈蚀率有较大的相关性,且沿长度方向不均匀锈蚀参数随其平均质量损失率增加而增大.用微段最大锈蚀率计算得到的锈蚀钢筋屈服荷载预测值与试验值较为接近,可为相关研究提供参考.

To investigate the change law of corrosion rate along the length direction of steel bars and its effect on mechanical properties of corroded steel bars,electrochemical acceleration corrosion experiments of concrete slabs were carried out.Results indicate that the non-uniform corrosion steel bars can be obtained through use of direct current method by controlling the concrete density and immersing method of specimen.Furthermore,it is found that the yield load and ultimate load of non-uniformly corroded steel bars under tension are more relevant with the maximum segment corrosion rate.And the value of parameter reflecting length characterization increases with average mass loss rate of corroded steel bars.Finally,the predicted loads expressed by the maximum segment corrosion rate are close to those of the experiments,which may be as references for other related researches.