Strength and abrasion characteristics of pervious concrete

In this paper, the influence of the size of coarse aggregate and aggregate/cement ratio on the strength and abrasion properties of pervious concrete is reported. Pervious concrete mixes are prepared with single-sized aggregates (4.75, 10 and 12.5 mm), blends consisting of three different aggregate sizes and aggregate-to-cement ratios of 3.2, 4.5 and 5. Experimental results indicate that the strength characteristics and abrasion resistance of pervious concrete decrease with increase in the size of aggregate as well as aggregate-to-cement ratio. As voids created by higher size aggregates were filled up by lower size aggregates, mixtures with blended aggregates achieved the lowest void content. Existing equations relating splitting-tensile and flexural strengths with cube compressive strength is verified. As density increases, void content of pervious concrete mixtures decreases. A simple regression model relating abrasion resistance index, which is defined as the ratio of square root of dimensionless number of revolutions to weight loss/initial weight of specimen in Cantabro test, to cube compressive strength of concrete is proposed. The developed model had reasonable goodness of fit, which indicated high accuracy.