Wang Lei, Dai Lizhao, Zhang Xuhui, Zhang Jianren
School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410114, China.
College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China.
Materials (Basel). 2016 Dec 23;10(1):6. doi: 10.3390/ma10010006.
The filling of strand corrosion products during concrete crack propagation is investigated experimentally in the present paper. The effects of stirrups on the filling of corrosion products and concrete cracking are clarified. A prediction model of crack width is developed incorporating the filling proportion of corrosion products and the twisting shape of the strand. Experimental data on cracking angle, crack width, and corrosion loss obtained from accelerated corrosion tests of concrete beams are presented. The proposed model is verified by experimental data. Results show that the filling extent of corrosion products varies with crack propagation. The rust filling extent increases with the propagating crack until a critical width. Beyond the critical width, the rust-filling extent remains stable. Using stirrups can decrease the critical crack width. Stirrups can restrict crack propagation and reduce the rust filling. The tangent of the cracking angle increases with increasing corrosion loss. The prediction of corrosion-induced crack is sensitive to the rust-filling extent.
本文通过实验研究了混凝土裂缝扩展过程中钢绞线腐蚀产物的填充情况。阐明了箍筋对腐蚀产物填充和混凝土开裂的影响。建立了一个结合腐蚀产物填充比例和钢绞线扭转形状的裂缝宽度预测模型。给出了从混凝土梁加速腐蚀试验中获得的关于开裂角度、裂缝宽度和腐蚀损失的实验数据。所提出的模型通过实验数据得到验证。结果表明，腐蚀产物的填充程度随裂缝扩展而变化。锈蚀填充程度随着裂缝扩展而增加，直至达到临界宽度。超过临界宽度后，锈蚀填充程度保持稳定。使用箍筋可以减小临界裂缝宽度。箍筋可以限制裂缝扩展并减少锈蚀填充。开裂角度的正切值随腐蚀损失的增加而增大。腐蚀诱导裂缝的预测对锈蚀填充程度很敏感。
