Permeable concrete is a kind of porous lightweight concrete material, which has good permeability and air permeability, which is conducive to the infiltration of rainwater and the replenishment of groundwater. It is mainly composed of the following materials:
Coarse aggregate: gravel or pebbles: as the main skeleton part of permeable concrete, it is required that the particle size is uniform and the gradation is reasonable, and the continuous graded gravel in the range of 5-20mm particle size is generally selected.
Cement: ordinary Portland cement (P·O) or slag Portland cement (P·S): As a cementing material, it forms a stable structure with aggregate to ensure the strength and durability of concrete.
Cementing material reinforcing agent:
Cementing materials or reinforcing agents for permeable concrete: These additives can improve the cohesion and strength of concrete while ensuring sufficient porosity to achieve water permeability.
Fine aggregates (as needed):
Sand: In some permeable concrete mixes, an appropriate amount of fine sand will be added to improve the working performance of the mixture, but the dosage should be controlled to the extent that the pores are not blocked.
Water: Clean drinking water: For mixing concrete, the choice of water-cement ratio is critical to the performance of permeable concrete, and it needs to maintain proper flow in order to facilitate construction without affecting permeability.
Pigments (optional):
Inorganic or organic pigments: To meet landscape design needs, pigments are sometimes added to permeable concrete to give rich color to the pavement.