2. The pervious concrete model and measures for improving strength
A model of the pervious concrete is shown in Fig. 1. The pervious concrete is a porous composite material. The single-diameter aggregate forms the concrete framework. The cement paste or mortar binds the aggregate together. There are many pores with diameters above 1 mm in the pervious concrete, so water can penetrate through the concrete quickly, but the strength of the pervious concrete is relatively low due to the pores.