Quzhou South City Primary School Case

Permeable concrete

1. Definition

Ecological permeable concrete, also known as drainage concrete, is a new type of eco-friendly paving material made by blending a certain proportion of small gravel, high-grade concrete, permeable admixtures, water, colored reinforcing agents, and stabilizers. It forms a honeycomb structure with coarse aggregates bonded by a thin slurry layer, allowing rainwater to infiltrate the ground and replenish groundwater. It also effectively eliminates the environmental pollution caused by oil compounds on the ground. With its vibrant colors and landscape integration, it contributes to a harmonious urban environment, protecting nature, maintaining ecological balance, and alleviating the urban heat island effect.

2. Permeable Concrete Construction Process

Mixing: Blend cement and aggregates in a mixer according to proportions to create well-mixed material.

2. Pouring: Before pouring, the subgrade must be moistened with water. Otherwise, the rapid loss of moisture in the permeable concrete will reduce the bonding strength between aggregates. Simply lay the material flat on the subgrade.

3. Vibration: Avoid excessive vibration and compaction during the pouring process.

4. Compaction: 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 its numerous pores, permeable concrete is prone to water loss and dries quickly, thus requiring film-based curing.

6. Product: The film curing time for pervious concrete should be no less than 7 days, followed by applying a layer of specialized pervious concrete sealer.