硅灰-玄武岩纤维改性透水混凝土力学性能与耐久性研究

Study on Mechanical Properties and Durability of Silica Fume-Basalt Fiber Modified Pervious Concrete

为了探讨不同掺入量的硅灰以及玄武岩纤维对改性透水混凝土的强度、渗透性及耐久性的影响,采用等体积法对不同掺合料进行变量控制,设计9组配合比,分别对抗压强度、孔隙率以及冻融循环质量损失率进行测试。结果表明:适量硅灰以及玄武岩纤维的掺入可以显著提高透水混凝土强度与抗冻性;硅灰等体积替代水泥并不会对混凝土的孔隙率造成巨大影响,掺入过量的纤维会同时损失强度与渗透性;硅灰掺量为10%、玄武岩纤维掺量为2 kg·m^(-3)时,改性透水混凝土的渗透性良好,强度与耐久性能达到最优。

In order to investigate the effects of different amounts of silica fume and basalt fiber on the strength,permeability and durability of modified pervious concrete,the equal volume method was used to control the variables of different admixtures.Nine groups of mix ratios were designed to test the compressive strength,porosity and freeze-thaw cycle mass loss rate respectively.The results show that the addition of appropriate amount of silica fume and basalt fiber can significantly improve the strength and frost resistance of pervious concrete.The equal volume replacement of cement with silica fume will not have a huge impact on the porosity of concrete,and the addition of excessive fiber will simultaneously lose strength and permeability.When the content of silica floss is 10%and the content of basalt fiber is 2 kg·m^(-3),the permeability of the modified pervious concrete is good,and the strength and durability are optimal.