Spot supply of permeable concrete sealing agent in Gezhuang Town, West Montaigne
In recent two years, Europe and the United States Japan and other countries have developed and used one that can allow rainwater to flow into the ground, Effectively supplemented be launched To alleviate some urban environmental problems such as the sharp decline of the urban groundwater level, and developed permeable concrete , also called porous concrete, is composed of aggregate, cement , a kind of porous lightweight concrete mixed with additives and water, which does not contain aggregate The surface of coarse aggregate is coated with a thin layer of cement slurry, which is used for mutual bonding in sidewalks, parks, squares, stadiums, and botanical garden roads , lightweight roads, parking lots, underground construction projects and new sports venues. Forming a honeycomb structure with evenly distributed cavities, It is breathable Colored stone is permeable and light in weight, which can also be called drainage concrete. Effectively replenish groundwater and relieve urban groundwater level Some urban environmental problems such as sharp decline. And it can effectively eliminate the harm of oil compounds on the ground to environmental pollution; meanwhile It is an excellent pavement material that can protect nature, maintain ecological balance and alleviate urban heat island effect; It is good for the human living environment Sexual development and urban rain Water pipe Management and water pollution prevention , has special significance. Proportioning ratio of construction materials: pervious per cubic meter Floor Quantity calculation Permeability 15% Ratio: the compressive strength of this permeability can reach C40 above cement 350-400 kg . gravel 1600-1650 Kg permeable cement eight point eight kg . Appropriate amount of water (to be determined according to the results of small experiments For small experiments, hand drill is required for better mixing effect) Permeability 25% Ratio: the compressive strength of this permeability can reach C25 above cement 300-350 kg . gravel 1650-1700 kg . Cementitious material seven point five kg . Appropriate amount of water (to be determined according to the results of small experiments For small experiments, hand drill shall be used for mixing, and the effect is better) sealing agent
Product performance:
★ High permeability: it can quickly eliminate the ponding on roads and squares when it rains, reduce the burden of urban drainage facilities and prevent river flooding and water pollution when it rains intensively. Permeable floor has 15%-25% Porosity of , which can make the permeable speed reach 31-52 rise / rice / hour , the discharge rate of far more effective rainfall under better drainage configuration.
★ High bearing capacity: the bearing capacity of the permeable floor is up to C20-C40 Bearing standard of concrete , bearing capacity of general permeable brick.
★ Good decorative effect The permeable floor has a color optimization scheme, which can cooperate with the designer's creativity to achieve the decorative style required by different environments and personalities. This is difficult to achieve with ordinary permeable bricks.
★ A large number of easily maintainable voids can absorb urban pollutants (such as dust) and reduce dust pollution. It is unnecessary to worry about the problem of pore plugging. The unique permeable pavement system makes it easy to solve it by high-pressure water washing.
★ Freeze thaw resistance Permeable pavement has stronger freeze thaw resistance than ordinary concrete pavement, and will not be subject to fracture of the surface affected by freeze thaw, because its structure itself has large pores. Concrete sealer
★ The wear resistance of the permeable floor is better than that of asphalt, close to the ordinary floor, and avoids the disadvantages of short service life and uneconomic of ordinary permeable bricks.
★ The density of high heat dissipation materials is low（ 15-25% ) reduces heat storage capacity The special pore structure makes the lower underground temperature transfer to the ground, thus reducing the temperature of the entire paved ground. These characteristics make the permeable pavement system close to the ground covered by natural vegetation in terms of heat absorption and heat storage functions.
★ The permeable concrete system has a large porosity, which can absorb sound and reduce environmental noise. Construction method: one Formwork erection: the construction personnel shall carry out separate formwork erection and regional formwork erection according to the design requirements, and pay attention to the height, perpendicularity, flashing slope and other issues in formwork erection. two , mixing: Pervious concrete shall be mixed with ordinary concrete mixing machine. During mixing, materials shall be put into the mixer according to the specified proportion and feeding sequence of materials. First, cement and water shall be mixed about sixty Seconds later , and then pour the specified amount of stones into the mixer. Depending on the uniformity of mixing, the time of mechanical mixing can be appropriately extended, but it is not suitable to mix for too long. three , curing: after the surface concrete is formed and dried three About days Apply transparent sealing agent to enhance durability and aesthetics. If the time is too long, the pores of permeable concrete will be polluted and blocked.
Precautions: permeable concrete sealant
★ According to the construction needs of different projects, each cubic meter of permeable floor concrete only needs to add Dechang permeable floor cement 6-10 Kilogram is enough.
★ On the construction site, a special person must be responsible for the proportion of materials.
★ Strictly control the water cement ratio, that is, control the amount of water added. If the amount of water added is too large, the mixture will bleed, and the water will be separated during mixing 2-3 Secondary join , cannot be added at one time.
★ In order to mix materials evenly, extend the mechanical mixing time appropriately, but not too long.
★ If there is a requirement for the flatness of the ground, the wear-resistant sealing agent of the surface layer shall be applied after polishing.
Packaging and storage:
★ Packed with paper plastic composite bags, each bag of permeable binder 15kg 。
★ The product should be stored in a cool, dry and ventilated place to avoid moisture; The unopened materials can be used for a long time as long as they are properly stored and free from moisture.
