纤维再生混凝土材料力学性能试验研究

Experimental Study on Mechanical Properties of Fiber Recycled Concrete

首先通过控制再生混凝土材料中纤维的种类,分析了纤维种类对再生混凝土材料力学性能的影响,然后采用正交试验的方法设计,分析了聚丙烯纤维直径、纤维长度和质量比对添加聚丙烯纤维再生混凝土材料性能的影响。研究结果表明:植物纤维和直聚丙烯纤维均可以抑制再生混凝土的破坏,曲聚丙烯纤维不能抑制再生混凝土的破坏;且植物纤维和直聚丙烯纤维可以增强再生混凝土的峰值强度和变形模量,随着养护时间的增加,植物纤维的增强效果减弱;同时聚丙烯纤维质量比对抗压强度和抗拉强度均有显著影响,聚丙烯纤维长度对抗拉强度影响显著,说明纤维质量比和长度是影响再生混凝土材料强度的重要因素。

In this paper, the influence of fiber types on the mechanical properties of recycled concrete materials is analyzed by controlling the fiber types in recycled concrete materials.Then, the influence of the diameter, length, and mass ratio of polypropylene fibers on the properties of recycled concrete materials is investigated by the design method of orthogonal tests.The results reveal that both plant fibers and straight polypropylene fibers could inhibit the damage to recycled concrete, while curved polypropylene fibers could not.The peak strength and deformation modulus of recycled concrete can be enhanced by plant fibers and straight polypropylene fibers, but with the increase in curing time, the strengthening effect of plant fibers decreases.At the same time, the mass ratio of polypropylene fibers has a significant impact on compressive strength and tensile strength, and the length of polypropylene fibers greatly affects tensile strength, which indicates that the mass ratio and length of fibers are important factors affecting the strength of recycled concrete materials.