Performance Study of Eco-Concrete Based on Waste Demolition as Recycled Aggregates

Abstract

Aggregates are considered as essential constituents in the composition of ordinary concrete or special concretes. The use of recycled aggregates is of great interest from the economic and environmental point of view. This study concerns the use of aggregates issued from the waste of crushing of the old concrete as a substitution for natural aggregates. An experimental program plan includes the study of the behavior of recycled aggregate concretes (RAC) at replacement of 0 %, 30 %, 50 %, 70 % and 100 % of recycled aggregates respectively. The objective of the present research work is to study the substitution effect of recycled aggregates (RA) on the physical and mechanical characteristics of a local recycled concrete. The non-destructive test methods NDT (Rebound hammer and ultrasonic velocity) were adopted to assess the mechanical response. The correlation of these tests had been considered for the different properties of tests to see wither; they are reliable to characterize a local recycled concrete, in this particular case of study. The results obtained showed that there is a negative impact of replacement ratio of recycled aggregate on the physical and mechanical properties mainly higher air content, lower density, greater absorption and decrease in strength in comparison with reference crushed aggregate concrete (CAC). Further, low correlation coefficients were registered to predict the due compressive strength in this case regarding the effect of aggregate type.