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Strength and drying shrinkage of green concrete
Published in
Volume: 88
Issue: 2
Pages: 28 - 35
The effective utilisation of waste materials of thermal power stations such as fly ash and bottom ash as partial replacement to cement and fine aggregate in concrete reduce disposal problems. In this study the bottom ash is used to replace the natural river sand upto 100% and thus it reduces the usage of river sand and reuse bottom ash in concrete which is ecofriendly and can be called Green concrete. The most important governing factor that determines the age of concrete structure is durability. Bottom ash is used as fine aggregate (30%, 60% and 100%) in concrete to reduce its environmental pollution (air, land and water) and to conserve natural river sand which is exploited for construction. This green concrete containing bottom ash is designed for 30 MPa with fixed water to binder ratio and slump value; and is evaluated for heat of hydration, compressive strength, and modulus of elasticity. Long term drying shrinkage was evaluated for 365 days and an empirical relationship was developed to predict 10 years of drying shrinkage of green concrete. Test result show that 30% bottom ash resulted high compressive strength and modulus of elasticity than control mixture at 90 days. The drying shrinkage property of bottom ash resulted better and even superior performance for long term durability. The experimental investigation also concludes that green concrete containing 30% of bottom ash for fine aggregate replacement outperforms control concrete for the designed strength of 30 MPa at 90 days and predicted drying shrinkage for long term durability up to 10 years.
About the journal
JournalIndian Concrete Journal