The Utilization of Recycled Aggregate in High Performance Concrete: A Review

Abstract

This paper reviews the use of Recycled Aggregate (RA) that is collected from construction demolition waste in the production of concrete. The paper primarily focuses on the possibility of using RA in High Performance Concrete (HPC). By analytically reviewing previous work, this study reports the mechanical and physical properties of HPC prepared using RA. The study summarizes the results of workability, water absorption, dry density, compressive strength, tensile strength, and flexural strength of HPC prepared with RA as reported in previous works. The paper also addresses the microstructure and durability performance of this concrete. Using RA in concrete production is an environmentally friendly solution to the continuous depletion of natural aggregates. RA could improve the cement matrix mechanical properties. Due to the porosity of RA, they have lower unit weigh than natural aggregates. For the same reason, RA can significantly decrease the workability of concrete. It is reported that using RA increases compressive strength of HPC. Both splitting and flexural strengths are increased with RA, however, they are decreased when the ratios of replacement are increased. The use of RA in the production of HPC seems to be promising. This paper presents some recommendations to further study this topic.

Keywords

• Durability performance
• green concrete
• high performance concrete
• mechanical properties
• microstructure
• physical properties