Experimental investigation of the effect of substitution of aggregate by lightweight pumice on the performance of porous concrete pavement

Porous concrete refers to a combination of cement and water, without fine grains or with a small amount of fine grains, which is important in terms of water transferability and permeability. This material can act as a drainage and carry rainwater and enhance groundwater. In the present article, the effect of replacement of pumice mineral additive with aggregate of porous concrete with volumetric percentages of 25, 50, 75 and 100% was studied on compressive strength, permeability coefficient and porosity percentage. Laboratory analysis was performed using SAS 9.4 software at 95% confidence level for all samples. The results show that with the replacement of the pumice additive in the structure of the porous concrete and the corresponding removal of the aggregate, the compressive strength of the samples is reduced due to the porosity of the pumice structure and the permeability coefficient and porosity increase. The reduction of compressive strength with increasing pumice percentage for all samples was 60.49, 83.86, 85.96 and 86.98%, respectively. Increasing the permeability coefficient with increasing pumice percentage for all samples was 10.13, 14.96, 18.7 and 24.94%, respectively.