聚丙烯纤维水泥稳定碎石力学性能试验研究

Experimental Study on Mechanical Properties of Cement Stabilized Crushed Stones Reinforced with Polypropylene Fiber

为了研究聚丙烯纤维对水泥稳定碎石力学性能的影响,对聚丙烯纤维水泥稳定碎石和普通水泥稳定碎石的抗压强度、劈裂抗拉强度、抗压回弹模量、抗弯拉强度和抗弯拉弹性模量进行了测试,给出了聚丙烯纤维体积掺量合适的建议范围为0.06%~0.08%.同时根据试验结果的回归分析,得出了聚丙烯纤维体积掺量与聚丙烯纤维水泥稳定碎石各力学性能指标的关系式.试验结果表明：聚丙烯纤维的掺入对水泥稳定碎石的各种强度均有一定的提高,能有效地减小抗压回弹模量和抗弯拉弹性模量,提高了其抗变形能力;在聚丙烯纤维体积掺量小于0.1%的范围内,随着纤维掺量的增加,水泥稳定碎石各种强度有增加的趋势,而其抗压回弹模量和抗弯拉弹性模量是逐渐降低的.

In order to study the effect of polypropylene fiber upon each mechanical property of cement stabilized crushed stones,the experimental research on the mechanical properties including compressive strength,splitting tensile strength,compressive modulus of resilience,flexural tensile strength and flexural tensile modulus of elasticity of polypropylene fiber reinforced cement stabilized crushed stones and common cement stabilized crushed stones was conducted.Four fiber volume fractions were adopted,which were 0.04%,0.06%,0.08% and 0.1%.At the same time,the relation formulas between the fiber volume fractions and the mechanical indices have been obtained according to the regression analysis of the test results.The appropriate volume fraction range of polypropylene fiber was suggested,which was 0.6‰ to 0.8‰.The results indicate that the addition of polypropylene fiber has certain reinforcement on several strengths of cement stabilized crushed stones,however,it can effectively decrease compressive modulus of resilience and flexural tensile modulus of elasticity of cement stabilized crushed stones,and then the ability of the resistance to deformation of cement stabilized crushed stones can be increased.When the volume fiber content is not beyond 0.1%,there is a tendency of increase in the strengths,while compressive modulus of resilience and flexural tensile modulus are gradually decreasing with the increase of polypropylene fiber content.