关键词: 透水混凝土;配合比设计;全孔隙率;堆积密实度;可压缩堆积模型

Abstract: Based on the compressible packing model and the total porosity was taken as the main mix proportion design parameter, a mix proportion design method of pervious concrete considering the influence of molding process and aggregate gradation was proposed.In this method, the graded aggregates with high dry packing density were selected based on the compressible packing model, the relationship between the packing density of the aggregates in pervious concrete and its dry packing density was established by introducing a scale factor λwhich reflected the influence of the molding method, then the aggregate mass per unit volume of pervious concrete was determined; and the paste volume and cement mass were calculated according to the aggregate mass and water-cement ratio.the pervious concrete has been formulated according to this method to validate it, the results demonstrate that the gap between the measured total porosity and the design total porosity is very small, which indicates that this method achieves the design object, and the strength variation tendency against the volumetric fraction of fine aggregates is similar to that of aggregate's dry packing density, but not the higher the dry packing density the higher the strength, the strength is also affected by the aggregates size.

Key words: pervious concrete;mix proportion design;total porosity;packing density;compressible packing model