变形钢筋与橡胶混凝土黏结性能的试验研究

Experimental research on bond strength between rubberized concrete and deformed bar

采用中心拉拔试验对变形钢筋与橡胶混凝土的黏结性能进行了研究,分析了橡胶颗粒掺量、橡胶颗粒粒径、改性方法和钢筋直径对黏结强度的影响。结果表明,钢筋与橡胶混凝土黏结和普通混凝土一样,受力过程分为胶结阶段、强度上升直线段和强度上升曲线段,只是橡胶混凝土各阶段的黏结强度较普通混凝土低。钢筋与橡胶混凝土的黏结强度随橡胶颗粒掺量的增加和粒径的减小而减小;随着变形钢筋直径增大,其与橡胶混凝土的黏结强度先增大后减小;水洗和Na OH改性处理在提高钢筋与橡胶混凝土的黏结强度方面效果不明显。

Based on the C30 plain concrete,experimental study of bond strength between deformed barand rubberized concrete is carried by pull-out test.The influence of mixed quantity of particle rubber,particle rubber size,ways of modified particle rubber and deformed bar diameter on bond strength between rubberized concrete and deformed bar is investigated.The testing results show that the stress process of rubberized concrete between deformed bar is same to plain concrete, divided into consolidation segment, strength rise straight line segment and strength rise curve segment, bond strength of rubberized concrete at each segment are lower than those of plain concrete.With the increase of mixed quantity of particle rubber, the bond strength between deformed bar and rubberized eoncreteis lower.With the increase of the particle rubber size,bond strength between deformed bar and rubberized concrete is increased.As the diameter of deformed bar increases,bond strength increases firstly then decreased.The of effect washing and NaOH modification in increase bond strength of deformed and rubberized concrete effect is not obvious.