Water Permeability Properties of Concrete made from Recycled Brick Concrete as Coarse Aggregate

Abstract

Water Permeability characteristic of concrete made from recycled brick concrete as coarse aggregate was investigated and compared with concrete made from crushed virgin clay brick and natural stone aggregate. For this, concrete samples of three different compressive strengths 17.2, 20.6 and 24.1 MPa were prepared as per ACI mix design methods from each of these aggregates. These concrete samples were then tested for compressive strength and water permeability using the AT 315 machine as per BS EN 12390-8: “Depth of Penetration of Water under Pressure”. Apart from these, porosity and bulk density were also measured in hardened concrete. Compressive strength of concrete produced from virgin brick and recycled brick concrete was found to be lower than the design strength at 28th day. Coefficient of water permeability of concrete made from recycled brick concrete as coarse aggregate was found to be higher than that of virgin brick and natural stone aggregate concrete of equivalent strength by 350 to 400%. Water permeability was found to be directly related to compressive strength and porosity in hardened concrete.