干掺纤维再生透水混凝土强度、透水性和耐磨性研究

Research on the Strength,Permeability and Wear Resistance of Dry-doped Fiber Recycled Permeable Concrete

为提高透水再生混凝土工程性能,对比研究了干掺玄武岩纤维和聚丙烯纤维对再生透水混凝土强度特性、透水性及耐磨性影响规律。研究结果表明:再生透水混凝土掺入纤维后抗拉强度提高,聚丙烯纤维再生混凝土抗压强度呈降低趋势变化,玄武岩纤维掺量0.3%时,再生透水混凝土抗压强度取得最大值,较未掺纤维再生透水混凝土抗压强度提高9.7%;纤维掺量超过0.43%时,掺聚丙烯纤维较玄武岩纤维再生透水混凝土抗拉性能要优;纤维掺量对再生混凝土孔隙率和透水系数影响较小,且满足CJJ/T 135-2009中透水混凝土设计要求;再生混凝土掺入纤维后的质量磨耗率减小,在玄武岩纤维掺量0.5%时,再生混凝土质量磨耗率取得最小值,较未掺纤维再生混凝土磨耗率降低29.2%;纤维掺量超过0.3%时,掺聚丙烯纤维较玄武岩纤维对再生混凝土耐磨性促进作用提高。建议玄武岩纤维最佳掺量为0.5%,聚丙烯纤维最佳掺量为0.7%。

In order to improve the engineering performance of permeable reclaimed concrete,the influence of dry-doped basalt fiber and polypropylene fiber on the strength characteristics,permeability and wear resistance of recycled permeable concrete were compared.The results show that the tensile strength of regenerated permeable concrete is increased after being incorporated into fibers,and the compressive strength of polypropylene fiber regenerated concrete shows a decreasing trend,and the compressive strength of regenerated permeable concrete is maximized when the basalt fiber is mixed with 0.3%,which is 9.7%higher than that of unadded fiber regenerated permeable concrete.When the fiber dosage exceeds 0.43%,the polypropylene-doped fiber concrete has better tensile performance than the basalt fiber regenerated permeable concrete.The influence of fiber content on the porosity and permeability coefficient of recycled concrete is relatively small,and it meets the design requirements of permeable concrete in CJJ/T 135-2009.The quality wear rate of recycled concrete decreases after adding fibers.When the content of basalt fibers is 0.5%,the quality wear rate of recycled concrete reaches the minimum value,which is 29.2%lower than that of recycled concrete.without fibers.When the fiber content exceeds 0.3%,the promotion Effect of polypropylene fiber on the wear resistance of recycled concrete is higher than that of basalt fiber.It is recommended that the optimal dosage of basalt fiber is 0.5%,and the optimal dosage of polypropylene fiber is 0.7%.