On the Influencing Factors for Performance of 50 MPa Level High-strength Permeable Concrete
Orthogonal experiments are carried out to study the influences of the water-cement ratio and the polyacryloni-trile fiber content and length on the performance of permeable concrete.The results show that the fiber content is the key factor,followed by the water-cement ratio and the fiber length.As the fiber content increases from 1.0 to 2.0 kg/m3,the average compressive strength of the concrete gradually increases and the average permeability coefficient decreases.The water-cement ratio is also an important factor affecting the performance of permeable concrete.As the water-cement ratio increases from 0.25 to 0.30,the permeability coefficient shows a trend of increasing at first and then decreasing,while the compressive strength shows a trend of decreasing at first and then increasing.When the fiber length increases from 3 mm to 12 mm,the permeability coefficient increases from 1.29 to 1.83 mm/s,while the compressive strength shows a trend of increasing at first and then decreasing.Thus,permeable concrete with better performance in permeability coeffi-cient and compressive strength can be obtained by increasing the design porosity and adjusting the fiber content.
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