Impact of aggregate type and size and mineral admixtures on the properties of pervious concrete: An experimental investigation

Balancing the permeability with the compressive strength of pervious concrete is essential to satisfy the requirements for pavement concrete. The aggregate type and size and mineral admixtures are important factors influencing the permeability and the compressive strength of pervious concrete. 56 groups of pervious concrete samples with different aggregate types and sizes and mineral admixtures were prepared. Test results show that higher compressive strength and permeability are obtained in pervious concrete with dolerite aggregate compared to pervious concrete with granite aggregate. The optimum porosity and w/c for pervious concrete with both dolerite and granite are 18% and 0.25, respectively, in the studied ranges. For granite aggregate, the permeability decreases as the particle size increases in the case of single size and the lowest permeability is observed for the combined gradation of granite aggregate. The compressive strength of pervious concrete increases with the increase of replacement level of silica fume while it decreases with the increase of replacement level of fly ash. The maximum permeability for single used of silica fume and fly ash is found at the replacement level of 6% and 10%, respectively. The maximum permeability for the combined used of silica fume and fly ash was observed in the case of 0% fly ash and 6% silica fume. (C) 2020 Elsevier Ltd. All rights reserved.