聚丙烯纤维混凝土力学性能试验研究

Experimental study on mechanical properties of polypropylene fiber reinforced concrete

试验研究了聚丙烯纤维混凝土的抗压强度、抗剪强度、抗冲磨强度及弯曲性能,并与钢纤维混凝土进行了对比。结果表明:在混凝土基体不变情况下,低掺量聚丙烯纤维(掺量为0 91kg/m3)略微降低混凝土的抗压强度和抗剪强度,少许提高混凝土的抗弯强度,显著提高混凝土的弯曲韧性和断裂能,从而起到阻裂和增韧作用,而对混凝土的抗冲磨性能几乎没有改善。另外,网状聚丙烯纤维对混凝土抗弯强度和韧性的改善优于聚丙烯单丝纤维,但它们较钢纤维的增强增韧效果还有一定差距。

The results of an experimental investigation on the compressive,shear strengths and abrasion-erosin resistance as well as flexural properties of two polypropylene fiber reinforced concretes and the comparison with a steel fiber reinforced concrete were reported in this paper.The test results show that a low content of polypropylene fiber (0.91kg/m^3 of concrete) slightly decreased the compressive and shear strengths,and appreciably increased the flexural strength,but markedly enhance the toughness index and fracture energy for the concrete with the same mix proportion,consequently it plays a role of anti-cracking and improving toughness in concrete.Moreover,the polypropylene mesh fiber is superior to the polypropylene monofilament fiber in improving flexural strength and toughness of concrete,but the two types of polypropylene fibers are not good as steel fiber.All the polypropylene and steel fibers had no great beneficial effect on the abrasion-erosin resistance of concrete.