Shanghai Ocean University

Porous concrete

1. Definition

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

2. Permeable Concrete Construction Process

1. Mixing: Blend cement and aggregates in a mixer according to the specified ratio to achieve a uniform mixture.

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 spread the material evenly on the subgrade.

3. Vibrating: Avoid excessive 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 large number of pores, permeable concrete is prone to water loss and dries quickly, thus requiring film covering for maintenance.

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