Experimental study of aggregate size and gradation on pervious concretes' mechanic, hydraulic, and surface properties

Abstract

AbstractAs environmental impacts of materials in concrete construction have been an aspect that has been focused on lately, pervious concrete has been implemented widely around the world. Recently, as a reflection of this trend, research and application of pervious concrete have been multiplied. Pervious mixes are mostly being used on low traffic load environments such as pavements, parking lots, and greenhouses. Because of this inclination 10 ± 1.5 MPa is chosen in this study for target compressive strength. The aim of this study is to investigate the effect of aggregate type and gradation on pervious concrete properties with target compressive strength of 10 ± 1.5 MPa. Three different coarse aggregate types (limestone, river, and recycled) and three different fractions (15–25, 10–15, and 5–15 mm) were considered. Recycled coarse aggregates were obtained from the previous mixes with limestone coarse aggregates produced for this study. Mechanical properties such as compressive strength, splitting tensile and flexural strength, density, void content, abrasion strength, and drying shrinkage were determined. Results showed that it is possible to have similar compressive strength and higher void content for the pervious mixes produced with coarse recycled aggregates. While river coarse aggregates showed better quality for drying shrinkage, coarse limestone aggregates were more abrasion resistant.