Porous pavement construction steps
Stirring: The cement slurry in the permeable concrete mixture has a higher consistency and less quantity. To ensure the cement slurry wraps the aggregates evenly, a forced-action mixer is recommended, with a stirring time of over 5 minutes.
Before casting, the subgrade must be moistened with water. Otherwise, the rapid loss of moisture in the permeable pavement will weaken the bonding strength between aggregates. Since the permeable pavement mixture is relatively dry and hard, simply lay the mixed permeable pavement and good permeable pavement materials flat on the subgrade.
Vibration: Avoid excessive vibration or compaction during the pouring process. Generally, use a flat plate vibrator to gently vibrate the permeable concrete mixture after it has been spread, but be cautious not to use a high-frequency vibrator. Otherwise, it will make the concrete too dense, reducing the porosity and affecting the permeability. Additionally, a high-frequency vibrator can cause the cement paste to separate from the surface of the coarse aggregates, settle at the bottom to form an impermeable layer, and thus lose its permeability.
Rolling: After vibration, further compacting and leveling the permeable concrete mix should be done using solid steel pipes or light roller compactors. Considering the consistency of the mix and surrounding temperature, multiple rollings may be required. However, it is important to clean the roller before rolling to prevent adhesion of aggregates.
1. Performance characteristics of pervious concrete:
Porous concrete, also known as voided concrete, sandless concrete, or permeable pavement, is a type of lightweight concrete made by mixing aggregate, cement, and binder with water. It lacks fine aggregate and is formed with coarse aggregate surfaces bonded by a thin layer of cement paste, creating a honeycomb-like structure with uniformly distributed voids. This material is characterized by its breathability, permeability, and lightweight nature. It was developed to address the defects in existing urban road pavements, allowing rainwater to infiltrate underground and effectively replenish groundwater, while also eliminating the environmental hazards posed by surface pollutants such as oil compounds. Additionally, it serves as an excellent paving material for protecting nature, maintaining ecological balance, absorbing noise, and reducing the heat island effect.
2. Advantages
Reducing surface runoff, permeable concrete pavements can increase the infiltration of rainwater, thereby decreasing the number of surface runoff events in urban areas, slowing down the velocity of stormwater runoff, and ultimately reducing the total volume of urban rainfall runoff. It plays a crucial role in mitigating urban flooding.
2. Replenish groundwater and ensure water quality; permeable concrete connects with the subgrade beneath the pavement, allowing runoff to infiltrate the lower soil, thus maintaining stable groundwater levels and preventing water table decline. This process also reduces the pollution of runoff infiltrating through the pavement.
3. Enhance ecological environment: Permeable concrete boasts excellent water permeability and moisture retention, closely mimicking the ecological properties of natural grasslands and soil surfaces, thereby reducing the degree of harm to nature.
4. Improve urban thermal environment; permeable concrete features a porous structure, effectively reducing ground surface temperature and alleviating the "heat island effect."
5. Noise Attraction and Sound Reduction: Permeable concrete road surfaces provide noise reduction benefits. Due to the porous structure of permeable concrete, when sound waves strike its surface, they cause air movement within the small holes or gaps, thereby attenuating the sound waves.
3. Construction:
Temperature below freezing is unsuitable for construction. Forcing the work can lead to phenomena such as particle shedding and road cracking.
I. Product Introduction：
Cold patching material is aBitumenRoad repair materials, suitable for all-weather use, ideal for repairing...ComplexWeather and environmental considerations for different types of repairsBitumenRoad surfaces, such as asphalt concrete roads, cement concrete roads, parking lots, airport runways, etc. After years of continuous improvement and refinement,AsphaltCold patch materials offer more mature performance. Both in terms of quality and usage, they surpass hot-mixed asphalt and emulsified asphalt blends, and are characterized by their simple operation and storage.DurationMending, usage, and eco-friendly features have alreadyMany road repairsWidely applied in domestic municipal roads, general highways, and expressways.
Section 2: Key Features
1. Applicable Weather and Environment
Wide temperature range applicable for cold patching, can be used inSuitable for -30 to 50 degrees, offers excellent cold patching and waterproofing performance, and can be applied in rainy, snowy conditions, as well as in puddles and holes.
2. Simple installation
Utilize cold patch materials; no need for adhesive oil during repairs. Stock materials are readily available, and no heavy construction machinery is required. Different repair situations on the road surface can be addressed with options like impact compaction and manual compaction.
3. Easy to repair
Cold patch materialNot easyAging and bondingQuality is good.Function, repaired with anti-punching, resists shedding and cracking without the need for re-repair.
4. Easy to store
BitumenFinished products with cold patching material can be stored outdoors at room temperature for two years, while sealed bagged finished products have a storage time.
5. Immediate Access to Traffic
Areas repaired with cold patching materials do not require traffic closure and can be accessed.Instant MessengerVehicles to alleviate traffic congestion caused by road repair construction.
6. Eco-friendly
Cold patch materials are water-insoluble, therefore, they do not contaminate the atmosphere or water, which is beneficial to environmental protection.
7. Wide Application
Cold patch materials exhibit excellent adhesion with various substrates such as asphalt concrete, cement concrete, and metal surfaces. They are suitable for repairs and maintenance on a wide range of road surfaces, including highways, general roads, municipal roads, airport roads, and bridges.
8. Low repair costs
Construction using cold patch materials. Not restricted by weather conditions or the size and quantity of potholes; timely repairs can prevent the expansion of potholes, save repair materials, and during the repair process,No need.Heating and stirring, use as needed at any time, remaining materials can be reused in the next repair, preventing waste.
9. Social Benefits
Using cold patch materials promptly repairs road surfaces, maintains smoothness, ensures traffic flow, increases speed, reduces traffic accidents, minimizes road resurfacing, and extends road lifespan.
III. Usage Instructions
1. Clearing ditches
Generally, the patched holes and the surrounding gravel and debris should be cleaned up thoroughly. There should be no sludge, ice blocks, or other foreign matter inside the holes. Highway and municipal road repair projects. The patched holes and grooves should have neat edges, and the debris should be cleared.Please provide the Chinese content you would like to have translated into American English.To achieve a solid, firm surface.
Fill in the holes and compact them.
Add sufficient cold patch material into the pothole until it is above ground level.About 1.5cm in size, suitable for highway and general road repairs; the amount of cold patch material can be increased by about 10%. Once filled, the pothole is sealed.BetweenShould be higher than the road surface by four sides and in an arched shape. If the road surface is damaged, the depth should beWhen over 5cm, the filling work should be done in layers of 4cm, filling and compacting layer by layer, ensuring even distribution. After laying, choose the appropriate compaction tool and method based on the actual repair environment, area size, and depth. For example, manual tamping, vibration plate tamping, or roller compaction. After compaction, sprinkle a layer of fine stone dust or sand evenly on the surface, and sweep back and forth with cleaning tools to fill the surface gaps. RepairCompleteThe pit surface should be smooth, level, and free of wheel marks. The edges and corners of the pits should be compacted without any loose phenomena. The general repair should achieve a sufficient degree of compaction.93% and above. Highway patch density should reach over 95%.
Section 4: Packaging and Storage:
25Kilogram multiwall kraft paper bags, store in cool and dry place, shelf life6Month(s).
