RELATIVE PERFORMANCE OF HIGH QUALITY CONCRETES CONTAINING RECYCLED AGGREGATES AND THEIR USE IN CONSTRUCTION

This paper describes the development of mix design procedures for high performance concrete mixes containing recycled construction waste. Established mix design procedures were used initially to proportion recycled aggregate concrete (RAC) mixes. Findings from initial trials were then used to modify the current mix design techniques to produce improved concrete containing recycled aggregates at different levels of replacement. Only minor adjustments to established mix designs procedures were necessary. Results from tests on workability and compressive strength were analysed and compared with control concretes. It was found that the workability retention of RAC was unchanged compared with the controls, provided pre-soaking of the aggregates was undertaken before mixing. Compressive strengths of RAC decreased with increasing level of recycled aggregate replacement.

The work forms part of TEL's contribution to BRITE EuRAM Research Programme 2145, which is currently investigating recycling technologies. The main objectives of this project are to produce guidelines and specifications for the incorporation of waste materials in high quality cement and concrete products for the construction industry.

• ABSTRACT

• INTRODUCTION

• SCOPE

• CONSTITUENT MATERIALS

• TRIAL MIX PROGRAMME

• RESULTS AND DISCUSSION

• CONCLUSIONS

• FURTHER WORK