The engineering method of permeable pavement and the choice of materials used
The information comes from:the Internet posted on:2021-12-28
In order to realize a beautiful China, solve the ecological and environmental problems such as urban waterlogging and heat island effect, realize low-impact development technology, and ensure the natural accumulation of rainwater. Before the proposal of Sponge City in 2012, the Beijing Olympic Games and the Shanghai World Expo had already used new construction techniques such as colored permeable pavements. The permeable pavement realizes the rapid drainage of rainwater, and the "light rain does not wet shoes" improves the travel environment and makes the road more beautiful.
Permeable pavement is mostly made of concrete. Permeable concrete is the main material for permeable pavement. The use of fine aggregate is mainly abandoned in concrete to form porous honeycomb-shaped sand-free concrete with a porosity of 15-25%. Because the strength and compactness of concrete without fine aggregate are insufficient and the bearing capacity is poor, concrete reinforcement must be added. For cement, Portland cement with a label above 42.5 is required; the stones are selected according to the local market conditions. The surface layer recommends 3-5mm basalt or rice sand, and the bottom layer recommends 5-10mm melon seeds.
The method of permeable concrete pavement should choose the material ratio according to the strength, which is usually C15-C30. Permeable pavement has pores, unlike ordinary concrete, it is prone to problems such as surface layer sizing and drop, so it must be mixed strictly according to the mix ratio and construction plan, and the water-cement ratio must be controlled at the same time.
The practice of permeable pavement can be divided into four steps: material preparation-mixing and pouring-vibrating and tamping-curing the finished product. 1. In addition to the cement, stones, and reinforcing agents mentioned above, tap water and protective agents are also needed. 2. Stirring should strictly control the water-cement ratio, and the water should be added in multiple times. The initial setting time of permeable concrete is 2 hours, and paving should be carried out quickly after mixing, and expansion joints should be set at the same time. When pouring, it is necessary to sprinkle water to keep the roadbed moist and keep the road smooth. 3. Permeable concrete must use a low-frequency flat vibrator to maintain a certain porosity between the aggregates. 4. The recommended curing time for permeable concrete is 15 days or more, sprinkling water for more than 7 days, and spraying permeable concrete protective agent after curing.
Manufacturers of permeable pavement materials can choose Jiajing Eco, permeable concrete enhancer, protective agent factory direct sales, no middlemen earn the price difference, enhancer as low as 5000 yuan, market retail price 5600 yuan / ton, nationwide free shipping.
Permeable pavement is so popular that it can become the main material for the paving of light-loaded roads in sponge cities. Thanks to its several advantages, it is widely spread on the ground of squares, sidewalks, garden landscapes, park roads, riverside scenery belts, large square exhibition halls, resorts, campuses, stadiums, parking lots and so on.
(1) Increasing the water-permeable and air-permeable area of the city, adjusting the urban climate, and lowering the surface temperature will help alleviate the urban "heat island phenomenon";
(2) Make full use of rain, snow and precipitation to supplement the increasingly depleted groundwater resources in urban areas, and play the function of "reservoir"; improve the living conditions of plants and microorganisms.
(3) It can reduce the burden on the road drainage system during the rainy season, and significantly reduce the pollution of urban water bodies caused by heavy rain;
(4) Absorb the noise generated when the vehicle is running, create a quiet and comfortable life and traffic environment, and prevent water on the road surface and reflection at night in rainy weather.
(5) Prevent road surface water and night road reflections, and no black ice will form on the road in winter, which improves the comfort and performance of vehicles and pedestrians;
(6) A large number of voids can absorb urban pollutant dust and reduce dust pollution.
(7) Patterns and colors can be designed according to environmental and functional needs, and fully integrated with the surrounding environment.
