Permeable concrete is a paving material developed and used by countries such as Europe, the United States, Japan, and others to address the deficiencies in the surfaces of original urban roads. This material allows rainwater to infiltrate the ground, effectively replenishing groundwater and alleviating various urban environmental issues, such as the rapid decline in groundwater levels. It effectively eliminates the environmental hazards posed by pollutants like oil compounds on the surface, while protecting groundwater and maintaining ecological balance, and mitigating the urban heat island effect. It holds special significance in the positive development of the human living environment and in urban rainwater management and water pollution prevention efforts.

Porous concrete systems come in a range of color formulas, designed to complement creative designs and cater to different decorative styles for varying environments and personal tastes. This is a special paving material that cannot be achieved with traditional paving or standard porous bricks.

Permeable concrete has been researched and applied in the United States since the 1970s and 1980s. Many countries have been extensively promoting its use, with Germany anticipating a short-term transformation of 90% of its roads to permeable concrete. This aims to change the past practice of ground paving that destroyed urban ecosystems, thereby realizing significant social benefits from permeable concrete roadways.

Manufacture

Porous concrete must meet strength requirements while maintaining certain interconnected voids to ensure permeability. Therefore, in its preparation, aside from selecting suitable raw materials, it is crucial to achieve the balance of strength and porosity through mix ratio design, production technology, and the use of additives. Porous concrete is composed of aggregates, cement, water, etc., with coarse aggregates, typically single or intermittent grade, used as the framework, with the amount of fine aggregates generally kept under 20% of the total aggregates. Cement options include silicate cement, ordinary silicate cement, and slag silicate cement; admixtures can include silica fume, fly ash, slag micro-fine powder, etc. During batching, first add cement, admixtures, and coarse aggregates, then half the water quantity, mix for 30 seconds; subsequently, add additives (such as admixtures and pigments), mix for 60 seconds; finally, add the remaining water, mix for 120 seconds, and discharge the mixture.

Construction

The construction of permeable concrete mainly includes spreading, shaping, surface treatment, and joint treatment. Spreading can be done mechanically or manually; shaping can be carried out using flat vibrators, vibratory leveling rollers, manual push-pull rollers, and vibratory leveling beams; surface treatment is primarily to enhance the visual appeal, involving repairs or cleaning of the shaped permeable concrete surface; the joints in permeable concrete pavements are set up similarly to those in normal concrete, with contraction joints spaced evenly, not exceeding 6 meters in distance.

Maintenance

After permeable concrete construction, cover and maintain it for at least 7 days to keep it moist. Prevent the concrete surface pores from being polluted by mud and sand during maintenance. Daily maintenance includes regular sweeping and cleaning of pores that have been sealed. Cleaning sealed pores can be done using methods such as blowing with a fan, high-pressure washing, or vacuum sweeping.

High permeability

Porous paving has a porosity of 15%-25%, allowing for a permeability rate of 31-52 liters per square meter per hour.

High load-bearing capacity

After national testing authorities' certification, the permeable pavement has a load-bearing capacity that fully meets the standards of C20-C25 concrete, exceeding that of general permeable bricks.

Decorative effect

Porous pavement comes with a color optimization ratio scheme, allowing it to complement designers' unique creativity and achieve decorative styles required by different environments and personalities. This is something that standard porous bricks often struggle to achieve.

Ease of maintenance

The concern about pore clogging is unnecessary; the unique permeable paving system allows for an effortless solution with just a high-pressure water wash.

Freeze-thaw resistance

Porous paving has a stronger frost-thaw resistance than regular concrete surfaces, as it won't crack due to frost-thaw cycles, thanks to its larger void structure.

Durability

Porous paving offers superior durability and wear resistance compared to asphalt, closely matching that of standard flooring, and avoids the drawbacks of shorter lifespan and economic impracticality commonly associated with standard permeable pavers.

High thermal conductivity

The low density of the material itself (15-25% voids) reduces its heat storage capacity. The unique pore structure allows for lower ground temperatures to enter the surface, thereby lowering the overall temperature of the paved surface. These features make the permeable paving system nearly as effective at heat absorption and storage as natural vegetation-covered ground.

Fatigue Strength

Due to the use of open-graded mix, the fatigue resistance is lower.

Eco-friendly permeable concrete is a composite material made by mixing cement, water, and permeable concrete enhancer (binding material) with high-quality aggregates of the same particle size or intermittent gradation, featuring a certain porosity. When used to create concrete pavements, retaining walls, and their products, it offers drainage, anti-slip, sound-absorbing, noise-reducing, and permeable properties. This can improve the surface ecological cycle, enhance traffic safety, protect the living environment, and address the negative impacts brought about by large-scale modern urban construction. Engineering practice has proven that permeable concrete is a new type of multifunctional paving material.

Porous cement concrete refers to concrete with a porosity of 15% to 25%, also known as sand-free concrete. As humanity places increasing emphasis on improving the ecological environment and protecting our homes, porous cement concrete is gaining more and more applications. Porous cement concrete is particularly suitable for use on the ground and road surfaces in urban parks, residential communities, industrial parks, sports fields, schools, parking lots, and more. This is because using porous cement concrete offers the following advantages:

Permeable cement concrete refers to concrete with a porosity of 15% to 25%, also known as sandless concrete. As humanity places increasing importance on improving the ecological environment and protecting our homes, permeable cement concrete is also gaining more and more applications. Permeable cement concrete is particularly suitable for use on the ground and pavements in urban parks, residential communities, industrial parks, sports fields, schools, parking lots, and more. Because, using permeable cement concrete offers the following advantages:

Permeable concrete

1) Increase the permeable and breathable areas in cities, enhance the heat and moisture exchange between the surface and air, regulate urban climate, reduce surface temperatures, and alleviate the "urban heat island" phenomenon. This is beneficial for improving the growth conditions of ground plants and soil microorganisms, and adjusting the ecological balance. 2) Fully utilize rainfall and snowfall, increase the relative humidity of the surface, replenish the increasingly depleted groundwater resources in urban areas, and utilize the permeable subgrade as a "reservoir" function.

3) Alleviates the burden on road drainage systems during the rainy season, significantly reducing the pollution of urban water bodies from heavy rains.

4) Absorbs noise generated by vehicle travel, creating a quiet and comfortable living and traffic environment, prevents road surface flooding during rain and glare at night.

5) Features excellent wear and slip resistance, effectively preventing slippage for pedestrians and vehicles, enhancing both comfort and safety for drivers and walkers.

6) Black ice (a nearly invisible thin layer of ice formed by frost fog) will not form on the road during winter, enhancing the comfort and safety for both vehicles and pedestrians.

7) Large voids can absorb urban pollutant dust, reducing dust pollution.

8) Patterns and colors can be designed to suit environmental and functional requirements, ensuring a perfect blend with the surrounding environment.

1) Increase the permeable and breathable area in cities, enhance the heat and moisture exchange between the surface and air, regulate urban climate, lower surface temperatures, and benefit in alleviating the urban "heat island" phenomenon. This improves the growth conditions for ground plants and soil microorganisms and adjusts the ecological balance. 2) Make full use of rainfall and snowfall, increase the relative humidity of the surface, replenish the increasingly depleted groundwater resources in urban areas, and utilize the permeable subgrade as a "reservoir" function.

3) Can alleviate the burden on road drainage systems during the rainy season, significantly reducing the pollution of urban water bodies caused by heavy rain.

4) Absorbs noise generated by vehicle travel, creating a quiet and comfortable living and traffic environment, preventing road surface water accumulation during rainy days and reflecting at night.

5) Features excellent wear and slip resistance, effectively preventing skidding for pedestrians and vehicles, enhancing both comfort and safety for drivers and walkers.

6) Winter will not form black ice on the road surface (a nearly invisible thin layer of ice formed by frost fog, extremely dangerous), enhancing the comfort and safety of vehicle and pedestrian traffic

7) Large voids can absorb urban pollutant dust, reducing dust pollution.

8) Patterns and colors can be designed according to environmental and functional requirements, ensuring a perfect blend with the surrounding environment.