钢纤维对再生骨料混凝土的力学性能研究

Study on the Mechanical Properties of Steel Fiber on Recycled Aggregate Concrete

摘要: 为研究钢纤维对再生骨料混凝土力学性能和工作性能的影响，通过掺加体积分数0、0.8%、1.2%、1.6%、2.0%的钢纤维开展抗压试验、劈裂抗拉、抗折试验和坍落度的研究，探讨在不同钢纤维掺量下的再生骨料混凝土的力学性能的变化规律。结果表明：随着钢纤维掺量的增加，坍落度持续降低；抗压强度先呈现先增大后减小，且抗压强度值均高于对照组，当钢纤维为0.8%掺量时，达到了最大值，抗压强度提高了10.66%；当钢纤维为1.2%掺量时，劈裂抗拉与抗折强度相较于对照组，劈裂抗拉最大值达到3.91 MPa，提高了32.54%，抗折强度达到了最大值8.1 MPa，提高了42.11%。适量添加钢纤维不仅可以改善了再生骨料混凝土的流动性，还能提高抗压、劈裂抗拉和抗折强度，且可以改善再生骨料混凝土早期强度。

Abstract: In order to study the influence of steel fiber on the mechanical properties and working properties of recycled aggregate concrete, the compression test, splitting tensile test, folding test and slump test were carried out by adding steel fiber with volume fraction of 0, 0.8%, 1.2%, 1.6% and 2.0%, and the change rule of mechanical properties of recycled aggregate concrete under different steel fiber content was discussed. The results show that with the increase of steel fiber content, slump decreases continuously. The compressive strength increased first and then decreased, and the compressive strength value was higher than that of the control group. When the steel fiber content was 0.8%, the maximum compressive strength was reached, and the compressive strength was increased by 10.66%.When the steel fiber content is 1.2%, the maximum splitting tensile strength and flexural strength are 3.91 MPa, an increase of 32.54%, and the maximum flexural strength is 8.1 MPa, an increase of 42.11%. Appropriate addition of steel fiber can not only improve the fluidity of recycled aggregate concrete, but also improve the compressive, splitting tensile and flexural strength, and improve the early strength of recycled aggregate concrete.