Abstract
This article presents the influence of the Recycled Concrete Aggregate (RCA) on the mechanical properties of self-compacting fly ash concrete (M30 Grade). The RCA from local construction demolition site were employed as a replacement for natural coarse aggregate (0% - 30%) in self-compacting concrete (SCC). The Viscosity modifying material used in this study was Class F fly ash. The results indicate that recycled concrete aggregate can be replaced by an optimal 25% replacement percentage in the manufacture of SCC without significantly affecting strength and durability.
Highlights
The use of concrete waste as a coarse aggregate (CA)reduces the emission of CO2(15-20%)by reducing the utilization of lime stone by 60% [1].While the amount of demolition waste materials generated in India has not yet been quantified properly, it is thought that presently the yearly rate of demolition of buildings and other structures in the major cities has reached one to 2%.Though the research on Recycled Concrete Aggregate (RCA) in concrete is going on for past 70 years, the use of recycled aggregate (RA) is of great importance to save resources, to protect the environment and to achieve sustainable development in the construction sector [2]
Coarse aggregate – Locally available granite crushed stones passing through 20mm sieve and retained on 12.5mm was used in this study
The results show that the when RCA partly replaced for coarse aggregate, a sustainable concrete could be manufactured
Summary
Self-compacting or consolidating concrete is one of the remarkable and innovative developments in the construction field recently. The main benefit of using SCC is that the hat will run at its own weight without the need for vibration required for placement and compaction with overburdened reinforcement and complexity of the formwork. In view of these potential benefits, this method has been applicable in many countries in building construction and construction. RCA uses concrete demolition materials and calcined clay masonry aggregates. For flexural strength and pull out strength addition of 15% of fly ash in mix is enough for maximum strength The use of recycled aggregates in the production of new concrete has gradually increased from an environmental and economic point of.
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