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The pervious floor is characterized by the use of single-grain coarse aggregate as the skeleton, and the porous aggregate structure formed by the thin layer of hardened cement slurry between the coarse aggregate particles, which contains more pores, and most of which have a diameter of more than 1mm The large pores therefore have good water permeability.
The construction process of the permeable floor is relatively complicated, especially the maintenance during construction is very important, which is related to the quality and cost of the floor after construction. The permeable floor has many vacancies and is prone to loss of water, so the necessary maintenance is very important. Especially for the maintenance of the previous floor, just pay attention to the excessive evaporation of water in the floor.
In China, pervious concrete pavement is mainly used in park roads, walking paths, parking lots, squares, etc. Permeable concrete pavements are divided into two types according to the load size and soil permeability:
When the pavement is used for other roads such as non-motorized lanes or landscaped hard ground, roads with fully permeable structures can be used. Add multi-porous cement stabilized gravel base on graded gravel, graded gravel and graded gravel base. Generally, the thickness of the multi-porous cement stabilized gravel base is not less than 200mm. Graded gravel, graded gravel and graded gravel base. The thickness should not be less than 150mm. For example, Xi'an Daming Palace National Heritage Park Yudao Square uses this structure. The permeable concrete surface layer is 120mm thick, and the base layer is 300mm thick graded crushed stone.
When the permeability coefficient of the soil foundation is more than 10-6m / s, and the distance from the seepage surface to the groundwater level is more than 1.0m, and the pavement is used for a sidewalk, a fully permeable structure sidewalk can be used. Rainwater percolates along the surface layer and the base layer, and finally infiltrates into the roadbed. The base layer can use graded gravel, graded gravel and graded gravel, and the thickness should not be less than 150mm. For example, the sidewalk of the eastern section of Guanghua Road in Baixia District of Nanjing adopted this type of permeable concrete pavement structure in the 2008 renovation.
The permeable floor should be sprayed for maintenance one day after pouring. It is not appropriate to use pressure water column to directly pour the concrete surface when pouring water. In this way, if you use a pressure water gun, there will be some adverse consequences. Under normal circumstances, sprinkle water directly from top to bottom. The watering maintenance time of the permeable floor is about not less than 7 days.
As mentioned above, these maintenance are very important and directly related to the use of the floor after molding. Therefore, the construction and maintenance of permeable floors is very important.