Flexural Behavior of Reinforced Recycled Concrete Beams: A Review

Abstract

Concrete is the most commonly used construction material which has been used in all type of civil engineering construction work. The concrete industry at present globally consumes 8 to 12 billion tones of natural aggregate annually. The huge consumption of natural aggregates at domestic and commercial construction will inevitably degraded the environment. Thus there is an urgent need to restrict the use of natural aggregates. Thus solution lies to use the recycled concrete aggregates into construction work. The aim of this study is to investigate the flexural behaviour of Recycled Aggregate Concrete. Many researches have been done in European countries and also of some Asian countries to investigate the mechanical properties of Recycled Concrete Aggregate, however approximately only 14% research has been done to study the structural behaviour of Recycled Concrete Aggregate. This study gains importance in view of the wide potential for demolished concrete to serve as a source of quality aggregate feed stock in a variety of structural and non-structural applications. This review study presents the impact of Recycled Concrete Aggregate, with different replacement ratios, on flexural strength. The review study yielded the following findings in regards to concrete structural properties:(1)Beams with RCA did experience greater mid span deflections under a service load and smaller cracking moments, (2) The flexural strength of the beams made with the Recycled Aggregate Concrete is lower than that of the concrete beams with natural aggregate; however the values are greater than the theoretical values (3) Also addition of some fibres in RCA, there is an improvement of almost all the structural properties of Concrete.