Performance Improvement of Urban Runoff System by Using Additive-Contained Pervious Concrete

By adding perlite and leca to porous concrete, its physical characteristics were studied. Compression strength, hydraulic conductivity and porosity of two porous concretes (without fine grains and with 20% fine grains) were measured. Results showed that adding 20% fine grains to porous concrete highly decreases hydraulic conductivity and porosity and increases compression strength. The highest compression strength (20.5 MPa) was seen in without-fine-grains samples (L10-0 treatment) and in with-fine-grains samples (34.85 MPa) in L15-20 treatment. The L5-0 treatment in both cases of with/without additives, had the highest hydraulic conductivity and porosity. Leca had better performance than perlite.