钢纤维再生混凝土摩擦剪力学性能试验研究

Experimental study on friction shear behavior of steel fiber recycled concrete

为研究钢纤维再生混凝土(SFRAC)在摩擦剪状态下的力学性能,以取代率、钢纤维掺量、压应力比为设计参数,设计36个再生混凝土立方体试件进行摩擦剪试验。观察了试件破坏形态,得到了荷载-位移曲线,分析了不同取代率、钢纤维掺量、压应力比及剪切次数对再生混凝土力学性能的影响。结果表明:钢纤维再生混凝土剪切强度随剪切次数的增加而显著降低,第二次、第三次剪切强度较第一次强度分别降低44%、53%;剪切强度随取代率的增加呈降低趋势,随钢纤维的掺入而提高,提高幅度在15%以内;钢纤维再生混凝土的剪切强度随压应力比的增大呈线性增长,随剪切次数的增多,压应力比对试件剪切强度提高的幅度减小。

In order to study the mechanical properties of steel fiber recycled concrete(SFRAC)under friction shear condition,36 cubic specimens of SFRAC were designed for friction shear test with substitution rate,steel fiber content and compressive stress ratio as design parameters.The failure modes of the specimens were observed,and the load-displacement curves were obtained.The effects of different substitution rates,steel fiber content,compressive stress ratio and shear times on the mechanical properties of recycled concrete were analyzed.The results show that the shear strength of steel fiber recycled concrete decreases significantly with the increase of shear times.The second shear strength and the third shear strength are 44%and 53%lower than the first shear strength,respectively.The shear strength decreases with the increase of the replacement rate,and increases with the incorporation of steel fiber,the increase range is within 15%.The shear strength of steel fiber recycled concrete increases linearly with the increase of compressive stress ratio,and the increase of compressive stress ratio decreases with the increase of shear times.