06-11-2014, 09:37 AM
Abstracts: Self-consolidating concrete (SCC) has wide use for placement in congested reinforced concrete structures in recent years. SCC represents one of the most outstanding advances in concrete technology during the last two decades. Because of its technical benefits with the developments in new generation superplasticiser, self-compacting concrete (SCC) has been widely used in construction industry. The SCC was developed first by Okamura and Ouchi. SCC can be considered to have a liquid type of behavior in fresh state. The concept of particle packing has always been a key element in the mixture proportioning of concrete. Research has shown that the packing density has significant influence on the fresh and hardened properties of concrete. In the present study, a systematic approach was followed for the optimization of the aggregate phases. The particle packing concept was used for the optimization of the aggregates. The aggregate combination of 50:20:30 (Fine aggregate: Coarse aggregate 10 mm maximum size: Coarse aggregate 20 mm maximum size) by volume resulted in maximum packing density (0.677), and was used in all the experiments. In the present investigation, experiments were carried out using different binder contents (450–700 kg/m3) and W/B ratio (0.29 to 0.34 by weight) with corresponding variation in the paste volume to investigate the influence of binder quantity and water binder ratio on the fresh and hardened properties of SCC. It was observed that as water binder ratio increased, workability of concrete was increased for all binder volume. This thing was happened due to increased in volume of paste due to increased in water quantity in mixed. The compressive strengths for the different mixtures varied from 57 MPa to 67 MPa. The compressive strength for 450 kg/m3 binder and 0.36 W/B ratio was observed around 67 MPa. The flexural strength of concrete varies between 5.96 MPa to 7.62 MPa.