石粉掺量对钢筋混凝土握裹力性能的影响

Influence of stone powder content on the grip strength of reinforced concrete

主要改变混凝土中石粉掺量、胶砂比、水灰比、吸水树脂用量,对比工作性及钢筋混凝土界面握裹力分析,采用混凝土气泡间隙测试仪观察拉升后界面结构和混凝土强度比较,最终确定C(水泥)∶S(砂)∶G(石)=1∶1.70∶2.64,石粉量8%,减水剂1%,吸水树脂0.20%,3 d强度提高31.9%;7 d强度提高29.1%;28 d强度提高57.2%,满足C40混凝土强度的要求,进一步提高机制砂对钢筋界面握裹力的性能。

This paper mainly changes the amount of stone powder,mortar ratio,water-cement ratio and water-absorbing resin in concrete,compares workability and reinforced concrete interface gripping force analysis,and uses a concrete bubble gap tester to observe the interface structure and concrete strength after pulling.By comparison,C(cement)∶S(sand)∶G(stone)=1∶1.70∶2.64,8%stone powder,1%water reducing agent,0.20%water absorbent resin,3 days strength value increased by 31.9%;7 days strength is increased by 29.1%;the 28 days strength is increased by 57.2%,which meets the requirements of C40 concrete strength,and further improves the performance of machine-made sand on the interfacial grip of steel bars.