Abstract: The mechanical properties, permeability and pore structure of basalt-polypropylene fiber reinforced concrete with varied fiber content were studied.Results reveal that in the range of 0-0.2% volumetric content of fiber,as fiber content grows, the compressive strength improves first and then declines;compressive strength increases by 9.2%,reaching the maximum, when the volumetric content of basalt fiber and polypropylene fiber is 0.05%. The splitting tensile strength increases with the addition of fiber,and the improvement effect of basalt fiber is better than that of polypropylene fiber. Both basalt fiber and polypropylene fiber can effectively reduce the impermeability of concrete,but would have an adverse impact on the impermeability of concrete once exceeding the optimum dosage. In addition,the fractal dimension of basalt-polypropylene fiber reinforced concrete was calculated.The fractal dimension has a good positive correlation with compressive strength and a good negative correlation with electric flux.

Key words: fiber reinforced concrete, mechanical properties, electric flux, pore structure, correlation analysis