盐冻循环对变形钢筋与再生混凝土黏结性能的影响

Influence of deicer-frosting cycles on bond property of deformed bar and recycled concrete

通过对不同直径变形钢筋与再生粗骨料掺量为60%的再生混凝土在淡水及浓度为3.5%的NaCl溶液中经历0,25,50,75次冻融循环黏结试验,研究了盐冻循环对变形钢筋与再生混凝土黏结性能的影响.结果表明:相比于淡水冻融,盐冻循环对变形钢筋与再生混凝土黏结性能的影响更恶劣,表现为黏结强度下降更快,峰值滑移增加更快.

In this paper,the influence of deicer-frosting cycles on bond property of deformed bar and recycled concrete is studied by the experiment of letting the deformed bars with different diameters and recycled concrete with a mixing amount of 60% recycled coarse aggregate experience freeze-thaw cycles（0,25,50,75times）in the fresh water and NaCl solution with a concentration of 3.5%.The results prove that the comparison with fresh water freeze-thaw cycles,the deicer-frosting cycles have a worse influence on the bond property of deformed bar and recycled concrete,which manifests as a sharper decline in bond strength and a faster increased peak slip.