The biggest difference between permeable pavement and traditional pavement is the word "permeable", what is the magic of it? The main factor is porosity. A study on the relationship between porosity and permeability of concrete showed that 8% porosity is the inflection point for the sharp increase in permeability of concrete:
If the use of impermeable dense grade + concrete pavement, the porosity should be less than 8% and not too close, preferably around 4%. If the design is a permeable open grade + large pore concrete pavement, the porosity should be greater than 8%, and in practical applications greater than 15%, in order to ensure that the pavement is permeable.
Permeable paving can make rainwater rapidly infiltrate, replenish groundwater, keep the soil moist, maintain groundwater and soil ecological balance, it is estimated that 50 million square meters of permeable floor, calculated by the annual precipitation of 600 mm, can store 30 million cubic meters of water, which is equivalent to a medium-sized reservoir capacity, it can be seen that the permeable paving storage function is very powerful.
Compared with ordinary floor tiles, how strong is the permeability of permeable bricks? The laying of permeable bricks is indeed very different from ordinary floor tiles, and the underground structure alone has 4 layers of gravel, cement, cloth strips and sand layers. And these are so that in rainy days, the sidewalk can automatically achieve water seepage, to avoid a heavy rain to "see the sea".
Permeable brick is an environmentally friendly building material that is conducive to promoting water circulation and improving the urban ecological environment. It has the characteristics of large water permeability, high strength and simple construction. It can be paved into a colorful permeable ground. It is mainly suitable for new construction, expansion, reconstruction of urban road engineering, outdoor engineering, garden engineering in the light load of roads, squares and parking lots and other pavement, environmentally friendly permeable bricks to achieve ecological protection, improve the living environment are of great significance, is the inevitable trend of future urban road development.
