Properties of pervious concrete made from graded and single size crushed coarse aggregate

The current search is aimed to investigate the properties of the pervious concrete cast from graded and single size coarse aggregate. A total of 18 mixes, nine mixes for each type, were designed, cast and sampled. The properties concerning compressive strength, flexural strength, density and porosity were discussed. The influence of aggregate type, water-cement ratio (w/c) and coarse aggregate to cement content ratio (CA/C) on the characteristics of pervious concrete was tested. Three w/c (0.3, 0.35 and 0.4) were used in each type of pervious concrete. For each w/c, three CA/C (3.5, 4.0 and 4.5) were employed. Besides, relationships between compressive and flexural strength, compressive strength and density, compressive strength and porosity and between density and porosity were developed and discussed. The experimental results prove that both types of pervious concrete have the usual tendency regarding the properties. At the same time, the tests of compressive strength, flexural strength and density reflect the reduced mechanical characteristics of pervious concrete in comparison to normal concrete. The density of the tested specimens decreased with increasing porosity up to 22% and 32% for graded and single size aggregate pervious concrete respectively, and then it continued approximately stable.