聚丙烯纤维增强混凝土的性能研究

RESEARCHON THE PROPERTIES OFPOLYPROPYLENE FIBER REINFORCED CONCRETE

针对路面混凝土的性能要求,重点对聚丙烯纤维混凝土的力学性能(抗折强度和抗压强度)、抗冲击性、抗氯离子渗透性和耐磨性在文中进行研究,聚丙烯纤维的掺量分别为0、0.25vol.%、0.5vol.%、0.75vol.%、1.0vol.%、1.25vol.%和1.5vol.%。相较于空白混凝土试块,聚丙烯纤维的加入能够有效的改善混凝土的力学性能和抗冲击性能。混凝土试块所吸收的弯曲断裂能和冲击能主要用于聚丙烯纤维与混凝土基体脱粘、聚丙烯纤维拔出和被破坏。同时聚丙烯纤维混凝土的抗氯离子渗透性和耐磨性也得到了显著改善。当聚丙烯纤维的掺量为1.0 vol.%时,聚丙烯纤维混凝土的抗氯离子渗透性和耐磨性最大。

The mechanical,impact resistance,chloride penetration resistance,and abrasion resistance properties of concrete reinforced with different proportions polypropylene fibers(PP fibers)are investigated,in which the propor-tions of PP fibers in concrete are 0,0.25%,0.5%,0.75%,1.0%,1.25%and 1.5%volume fraction of concrete.The results show that the flexural strength,compressive strength,and resistance of impact properties are improved.The absorbed fracture energy and impact energy are provided by the mechanisms of matrix cracking,PP fiber/matrix in-terface debonding,fiber pull-out and fiber rupture.Meanwhile,the resistance of chloride ion penetration and abra-sion properties are increased.The optimum properties of PP fiber concrete is obtained with the i.0 vol.%PP fiber.