Abstract
Abstract As permeable concrete contains more pores and larger pore size when improving its water permeability, it will affect its mechanical properties and durability, so it is of great significance to study the mixing ratio of porous concrete. Studying the mixing ratio of porous concrete is of great significance. The subject is studied in depth from the aspects of mechanical properties and water permeability, in order to prepare high-performance permeable concrete with high compressive strength and meet the requirements of infiltration. Firstly. Optimization of the performance of raw materials and mixing ratios of porous concrete, according to the aggregate gradation, aggregate particle size, and other factors on the mechanical properties of porous concrete, to determine its optimal aggregate mixing ratio. Three groups of high-performance pervious concrete specimens with different aggregate particle sizes and pore structures were examined for their real fine structure. Finally, after the preparation of high-performance pervious concrete was completed, the porosity, fractal dimension, equivalent diameter, contour coefficient, and roundness of the specimens were tested to investigate the effects of several factors mentioned above on the permeability coefficient and compressive strength properties of pervious concrete. The results show that the two-dimensional pore diameter is normally distributed, the diameter size is centrally distributed in the range of 0~10mm, and the number of pores in this range accounts for more than 70%. Gradually increasing aggregate particle size leads to an increase in the proportion of large pores inside the specimen. After the compressive strength test and porosity test, it was found that the water permeability coefficient of the porous concrete was the best for the single-grain limestone aggregate with the equivalent diameter range of 5~8mm. The results of this study have theoretical value in enriching and developing high-performance permeable concrete.
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