POROSITY AND PERMEABILITY OF PERVIOUS CONCRETE USING CONSTRUCTION AND DEMOLITION WASTE IN VIETNAM

Abstract

Using recycled aggregates (RA) from construction and demolition wastes to produce non-structural concrete is a sustainable solution with dual environmental benefits. There is potential to use RA to manufacture pervious concrete for permeable pavement systems. The ratio of concrete and clay brick aggregates, designed porosity, and the complete mix design has been evaluated for their contributions to making pervious concrete blocks. In this study, the porosity characteristics, hydraulic conductivity and mechanical properties of the pervious concrete made in Vietnam were investigated aiming to characterize the relationships among mechanical properties, total and effective porosities, and water permeability. Experimental results showed that the mechanical strengths decreased basically with increasing of the design porosity, in especial, the previous blocks made from clay brick aggregate led to the lowest of compressive and flexural strength. The ratio of mixed aggregates, on the other hand, gave a negligible influence on the effective porosity and permeability of pervious concrete blocks, and the water permeabilities were mainly controlled by the total porosities of tested pervious blocks.