ADMIXTURES' EFFECT ON MECHANICAL STRENGTH OF A CONCRETE MADE OF RECYCLED AGGREGATE

The needs of the construction sector are still increasing for concrete. However the shortage of natural resources of aggregate could be a problem for the concrete industry, in addition to the negative impact on the environment due to the demolition wastes. In the last decade a major interest has developed for the reuse of recycled aggregates that presents more than 70% of the concrete volume. These should fulfil the requirements of lower cost and better quality, in order to establish its role in the concrete. The aim of this study is to assess the effect of the local admixtures on the mechanical behaviour of recycled aggregate concrete (RAC). Physical and mechanical properties of RAC were investigated including density and water reduction. In addition the non destructive test methods (pulse-velocity, rebound hammer) were used to determine compressive strength. The results obtained were compared to crushed aggregate concrete (CAC) using the normal compressive testing machine test method. Thus, the convenience of indirect tests in the case of a recycled aggregate concrete were demonstrated.

• INTRODUCTION

• TEST PROCEDURES

• MATERIALS AND EQUIPMENTS

• TESTING

• ANALYSIS OF RESULTS

• RESULTS AND DISCUSSION

• CONCLUSIONS

• REFERENCES