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在砂浆中加入钢纤维可以显著地改善砂浆的各种力学性能,不同掺量、不同长度的钢纤维对砂浆性能的影响也不同。对11种不同比例的剪切型超短超细钢纤维(长度:6 mm,直径:0.2 mm)掺入量和6种不同比例的普通钢纤维掺入量的砂浆试件进行试验,研究了不同钢纤维掺入量对钢纤维增强砂浆的荷载—挠度规律的影响和其对弹性模量、弯曲断裂能、强度的影响,得出了剪切型超短超细钢纤维砂浆性能的规律:剪切型超短超细钢纤维砂浆的荷载—挠度与普通钢纤维砂浆的荷载—挠度曲线形状大致相同,但是比普通钢纤维砂浆荷载—挠度曲线更丰满。剪切型超短超细钢纤维砂浆的弹性模量随钢纤维掺量的增大而提高,在相同掺量下,剪切型超短超细钢纤维砂浆的弹性模量比普通钢纤维砂浆的弹性模量大。剪切型超短超细钢纤维砂浆弯曲断裂能和强度随钢纤维掺量的增大而提高,在钢纤维掺量小于3%时,普通钢纤维砂浆的弯曲弹性模量和强度略高于剪切型超短超细钢纤维砂浆;在钢纤维掺量大于3%时,剪切型超短超细钢纤维砂浆弯曲断裂能和强度明显高于普通钢纤维砂浆。
Addition of steel fiber into mortar can significantly improve the mechanical properties of mortar. Different dosage and different lengths of steel fiber have different effects on mortar properties. Eleven kinds of mortar specimens with different proportions of shear-type ultra-short super-fine steel fibers (length: 6 mm, diameter: 0.2 mm) and ordinary steel fibers with six different proportions were tested. The effect of different steel fiber incorporation on the load-deflection law of steel fiber reinforced mortar and its influence on elastic modulus, flexural rupture energy and strength were studied. The law of the properties of shear-type ultra-short superfine steel fiber mortar was obtained: The load-deflection of shearing ultra-short superfine steel fiber mortar is almost the same as that of ordinary steel fiber mortar, but it is more full than that of ordinary steel fiber mortar. The elastic modulus of shear-type ultra-short and ultrafine steel fiber mortar increased with the increase of steel fiber content. Under the same dosage, the elastic modulus of shear-type ultra-short superfine steel fiber mortar was higher than that of ordinary steel fiber mortar Large elastic modulus. The bending fracture energy and strength of the shear-type ultra-short superfine steel fiber mortar increase with the increase of steel fiber content. When the steel fiber content is less than 3%, the flexural modulus and strength of ordinary steel fiber mortar are slightly higher than Shear-type ultra-short superfine steel fiber mortar. When the steel fiber content is more than 3%, the bending rupture energy and strength of shearing ultra-short superfine steel fiber mortar are obviously higher than that of common steel fiber mortar.