预制页岩陶粒混凝土预留孔灌浆钢筋黏结性能试验研究

EXPERIMENTAL STUDY ON BOND BEHAVIOR OF STEEL BARS IN GROUTED HOLE OF PRECAST SHALE CERAMSITE CONCRETE

为研究页岩陶粒混凝土预留孔灌浆钢筋的黏结滑移性能,通过12个预制页岩陶粒混凝土梁式试件和2个现浇混凝土梁式试件的黏结滑移性能试验,研究了钢筋直径、螺旋箍筋配箍率、页岩陶粒混凝土强度对页岩陶粒混凝土预留孔灌浆钢筋黏结滑移性能的影响。试验结果表明:页岩陶粒混凝土预留孔灌浆钢筋的极限黏结强度随钢筋直径减小、页岩陶粒混凝土强度提高、螺旋箍筋配箍率增大而明显提高;所有页岩陶粒混凝土梁式试件最后均为黏结钢筋拉断破坏,没有发生黏结锚固破坏,表明页岩陶粒混凝土预留孔灌浆钢筋的黏结锚固性能优良,钢筋浆锚连接形式同样可应用于预制页岩陶粒混凝土构件连接。

To study the bond stress-slip relationships between grout and steel bar in shale ceramsite concrete,the beam tests of 12 shale ceramsite concrete beam specimens and 2 cast-in-situ concrete beam specimens were carried out,and the main influencing factors including the steel bar diameter,spiral hoops ratio and the shale ceramsite concrete strength were investigated. The test results showed that the ultimate bonding strength of steel bars in grouted hole of precast shale ceramsite concrete obviously increased with the reduction in reinforcement diameter,the increase of shale ceramsite concrete strength and the increase of spiral hoop ratio;all tested steel bars of precast shale ceramsite concrete specimens were broken at loading end,bond failure were not discovered,which demonstrated that grouted steel bars in precast shale ceramsite concrete behaved good bonding and anchorage performance,and the grouted and anchored steel bar connection method could be applied to the connection of precast shale ceramsite concrete components.