Compressive Strength of Concrete Using Recycled Concrete Aggregate as Complete Replacement of Natural Aggregate

Abstract

This paper presents a report of an experimental investigation on the effect of complete replacement of natural aggregate by recycled concrete aggregate in the production of concrete on the compressive strength of concrete. Two sets of concrete mixtures of ratios 1:3:6, 1:2:4, 1:1 1 /2:3, 1:1:2 by mass were cast using natural aggregates and recycled aggregates concrete respectively. The 28-day compressive strengths of 1:3:6, 1:2:4, 1:1 1 /2:3, 1:1:2 concrete using recycled concrete aggregates were 12.18 Nmm-2, 17.14 Nmm-2, 21.65 Nmm-2 and 25.81Nmm-2 respectively corresponding to 33%, 20%, 11 % and 20 % reduction in strength compared to concrete using natural aggregate.. The densities and compressive strengths of natural aggregate concrete were higher than that of corresponding recycled aggregate concrete. The results of the study showed that recycled concrete aggregate can potentially replace completely natural aggregate in the production of both non-structural and structural concrete.