Kunshan Huqiao Primary School

Permeable concrete

1. Definition

Ecological permeable concrete, also known as drainage concrete, is a new type of environmentally friendly paving material with excellent porosity and light weight. It is made by blending fine aggregates, high-grade concrete, water-permeable additives, water, color reinforcing agents, and stabilizers in a specific ratio. This material forms a honeycomb structure by the rough aggregate surfaces being bonded with a thin slurry, allowing rainwater to infiltrate the ground and replenish groundwater effectively. It also effectively eliminates the environmental hazards caused by pollutants like oil compounds on the ground. Moreover, its vibrant colors and landscape integration contribute to a harmonious urban environment, making it an excellent permeable pavement material for protecting nature, maintaining ecological balance, and alleviating urban heat island effects.

2. Permeable Concrete Construction Process

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

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 bonding strength between aggregates. Simply spread the materials evenly on the subgrade.

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

4. Rolling: After vibration, further compaction and leveling should be achieved using solid steel pipes or light roller compactors, for the permeable concrete mix.

5. Maintenance: Due to its numerous pores, permeable concrete is prone to water loss and dries quickly, thus requiring film curing.

6. Finished Product: The film wet curing time for permeable concrete should not be less than 7 days, followed by applying a layer of specialized permeable concrete sealer.