废弃聚丙烯混杂纤维再生混凝土力学性能

Mechanical Properties of Recycled Concrete with Hybrid Waste Polypropylene Fibers

通过改变废弃聚丙烯纤维和玄武岩纤维不同掺率组合,分析再生混凝土基本力学性能。结果表明:再生混凝土中掺入混杂纤维后抗压强度有不同程度降低,但低掺量废弃聚丙烯纤维对再生混凝土劈拉强度有明显提高作用。相对基准组混凝土而言,随着混杂纤维的不同掺率组合变化,除玄武岩纤维与废弃聚丙烯纤维比例为4∶1的实验组,其余各试验组的弹性模量均有不同程度的降低,而混杂纤维的掺入大大提高了混凝土的韧性。

This paper analyzes the basic mechanical properties of recycled concrete by changing the mixing ratio of waste polypropylene fiber and basalt fiber.The results show that the compressive strength of recycled concrete decreases in varying degrees with the addition of hybrid fibers,but the tensile strength of recycled concrete is obviously improved with the low addition of waste polypropylene fibers.Compared with the reference concrete group,with the change of mixing ratio of hybrid fiber,the elastic modulus of all test groups decreases in varying degrees,except the test group whose ratio of basalt fibers to waste polypropylene fibers is 4∶1,and the toughness of concrete is greatly improved by the addition of hybrid fibers.