带肋钢筋与高强水泥土黏结性能试验研究

Experimental Study on Adhesion Performance between Ribbed Steel Bar and High-Strength Cement Soil

【目的】为揭示带肋钢筋和高强水泥土之间的黏结作用机理,利用既有水泥土固化剂配比制作了33个尺寸为150 mm×150 mm×150 mm的立方体拉拔试样。【方法】通过直接拔出试验,分析锚固长度、水泥土保护层厚度和钢筋直径对钢筋水泥土黏结性能的影响。【结果】试验表明:钢筋与水泥土界面黏结强度随着锚固长度的增加而减小,钢筋和水泥土最佳保护层厚度为钢筋直径的2至3倍。【结论】随着钢筋直径的增加,直径大于10 mm后,钢筋直径增长变化对黏结强度影响幅度变小。

【Objective】The aim of this study is to uncover the bonding mechanism between ribbed steel bars and high-strength cementitious soil.Thirty-three cubic pull-out specimens with dimensions of 150 mm×150 mm×150 mm were produced using an existing cementitious soil solidifier ratio.【Method】Through direct pull-out tests,the influence of anchorage length,cementitious soil cover thickness,and steel bar diameter on the bonding performance between steel bars and cementitious soil was analyzed.【Result】The experiments indicate that the bonding strength at the interface between steel bars and cementitious soil decreases with the increase of anchorage length.The optimal cover thickness for steel bars and cementitious soil is between 2 to 3 times the diameter of the steel bar.【Conclusion】As the diameter of the steel bar increases,the impact of the diameter growth on the bonding strength decreases,especially when the diameter exceeds 10 mm.