Self-Compacting Concrete With Manufactured Sand And Recycled Coarse Aggregate

IJEP 41(6): 627-634 : Vol. 41 Issue. 6 (June 2021)

C. K. Gupta*, Shreekant Birgonda, A. K. Sachan and Pooja

Motilal Nehru National Institute of Technology, Department of Civil Engineering, Prayagraj – 211 004, India


Self-compacting concrete (SCC) is the concrete that can be easily placed and compacted due to its own weight and does not need any external compacting effort. This type of concrete is cohesive enough so that it is easy to handle without segregation and bleeding of concrete. Generally, after completing the useful life, the structures are demolished. This demolition waste can be converted into coarse and fine aggregate, which may find use in SCC also. In recent years, many researchers have tried to replace the natural coarse aggregate with waste material in concrete. The use of recycled coarse aggregate is commercially sustainable and technically good for the environment. The construction and demolition wastage are putting an adverse effect on the environment so the use of this waste shows the effective utilization of resources. For sustainable construction, C and D wastage are the main and important resources. The environmental problem due to C and D waste are landfills, illegal deposit, etc. Therefore, the reuse of C and D waste, such as recycled aggregate is the solution to these problems. Recycles concrete aggregate is obtained after crushing and screening old demolition waste. In mortar and concrete, sand is used as fine aggregate. For fine aggregate river sand is mostly preferred. When weathering of rock takes place over a period of million-year natural sand is formed. This sand is obtained from river beds and sand mining which are calamitous environmental concerns. Nowadays river sand is very difficult to get. Manufactured sand (M- sand) is that sand, which is obtained from crushed rock to required grain size distribution. For the required grain size of coarse aggregate, the rocks are crushed in special rock crushers and the crushed material is washed by clean water to remove fines.


Construction and demolition, Manufactured sand, Recycle concrete aggregate


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