Quzhou South City Primary School Case

Permeable concrete

1. Definition

Eco-permeable concrete, also known as drainage concrete, is a new type of environmentally friendly paving material made by mixing and blending small gravel, high-grade concrete, permeable admixtures, water, color enhancing agents, and stabilizers in a certain proportion. It forms a honeycomb structure by the coarse aggregate being bonded together with a thin slurry layer, allowing rainwater to infiltrate the ground and effectively replenish groundwater. It also effectively eliminates the environmental hazards posed by pollutants like oil compounds on the surface, and its vibrant colors and landscape integration contribute to a harmonious urban environment. It is an excellent permeable pavement material for protecting nature, maintaining ecological balance, and alleviating the urban heat island effect.

2. Permeable Concrete Construction Process

1. Mixing: Use a mixer to blend cement and aggregates in proper proportions to create well-mixed material.

2. Pouring: Prior to pouring, the subgrade must be moistened with water. Otherwise, the rapid loss of moisture in the permeable concrete will reduce the bond strength between aggregates. Simply spread the material evenly on the subgrade.

3. Vibration: Avoid vigorous vibration and compaction during pouring.

4. Rolling: After vibration, further compaction should be achieved using solid steel pipes or light roller compactors to flatten and ensure permeability of the concrete mixing material.

5. Maintenance: Due to the presence of numerous pores, permeable concrete is prone to water loss and dries quickly, thus requiring film covering for maintenance.

6. Product: Wet curing of the permeable concrete membrane should last at least 7 days, followed by applying a layer of specialized permeable concrete sealer.