Eco-friendly pervious concrete infrastructure for stormwater management and bicycle parking: a case study

A pervious concrete area (50 m²) was constructed for a dual purpose: stormwater management and bicycle parking. It consisted of two subareas (PC_a and PC_b) with dissimilar characteristics of pervious concrete mixes in strength, durability and permeability. To make the construction more eco-friendly and economical, coal fly ash was incorporated as a partial cement replacement by 21.4% in the PC_a pervious concrete mix. The PC_b was constructed with an industry proprietary pervious concrete mix. The subbase water storage can retain 4.1 m³ of the infiltrated stormwater before discharging excess water to a storm drain. The drainage water had an improved water quality in turbidity, organic carbon, phosphorus and fecal coliform concentrations. However, it had high pH and conductivity which might cause a negative impact on the environment. The constructed area has been in active use since its opening, accommodating ~30 bicycles at once on the safe and comfort pervious surface.