A Comparative Study on the Stress-strain Behaviour of Standard Grade Hfrscc under Confined and Unconfined States

Self compacting concrete (SCC), developed by Hajime Okamura, has proved to be an excellent concrete in terms of its compactability, flowability and durability apart from strength studies have proved that the effienciency of the SCC can be further increased by introduction of fibres like steel fibres, glass fibres etc. further enhances their toughness, tensile strength, resistance to crack propagation there by further enhancing the durability properties. The present paper deals with the behaviour of standard grade hybrid fibre reinforced self compacting concrete which is made with a combination of steel and glass fibres in suitable proportion. .It is observed that the confinement of the concrete has increased the 28 days strength from 12.39% to 28.2% for different percentages of confinements and It peak stress and corresponding strain at peak stress increases with increase in percentage confinements. An empirical equation is proposed between E and fck, in the form of E= 5700√fck. Out of the two analytical models were proposed for the stress-strain behaviour of HFRSCC under different confinements it is observed that the model based on Seanz equation is closely agreeing with experimental results.