钢纤维在混凝土中的应用

Application of steel fiber to concrete

为了降低高强度混凝土的脆性,在混凝土中加入微细钢纤维。当分别加入48 kg/m3的平直型和波浪型微细钢纤维时,试验后混凝土的开裂面积分别为没有加入钢纤维的30%和10%,加入波浪型钢纤维的混凝土比加入平直型钢纤维的抗裂性能更好。其他条件相同情况下,钢纤维的直径从0.30 mm分别减小到0.25,0.20 mm时,混凝土抗折强度分别提高13%和33%。当微细钢纤维的抗拉强度从1 800 MPa提高至2 800 MPa时,混凝土的抗压、抗折强度都增加10%。加入120 kg/m3的波浪型钢纤维的混凝土与相同加入量的平直型钢纤维的混凝土相比,抗压强度、抗折强度、抗拉强度都有小幅增长。

Micro-diameter steel fiber is added in concrete in order to decrease brittleness of high strength concrete. When straight line type and wave type micro-diameter steel fiber of 48 kg/m3 are added separately, cracking area after test are 30% and 10% of that without adding steel fiber, the crack resistance property of adding wave type steel fiber concrete is higher than that of straight line type steel fiber. When other things are the same, diameter of steel fiber is decreased from 0. 30 mm to 0. 25, 0. 20 mm separately, the breaking strength of concrete is increased 13% and 33% separately. When tensile strength of micro-diameter steel fiber is increased from 1 800 MPa to 2 800 MPa, the compressive and breaking strength of concrete is both increased 10%. To compare with the same amount straight line type steel fiber concrete, the compressive strength, breaking strength and tensile strength of concrete adding 120 kg/m3 wave type steel fiber are in- creased slightly.