Effect of Fly Ash on the Properties of Fresh Concrete

The use of good quality fly ash with a high fineness and low carbon content reduces the water demand of concrete and consequently, the use of fly ash should permit the concrete to be produced at lower water content when compared to a portland cement concrete of the same workability.

Benefits of Fly ash used in Portland Cement Concrete:

Use of fly ash in Portland cement concrete (PCC) has many benefits and improves concrete performance in both the fresh and hardened state. Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost effective. When Fly ash is added to concrete, the amount of Portland cement may be reduced.

Mix Design for Fly Ash based Concrete:

Use of Fly ash along with cement helps to provide specific properties like reduced early heat of hydration, increased long term strength, increased resistance to alkali aggregate reaction and sulphate attack, reduced permeability, resistance to the intrusion of aggressive solutions and also economy.

Salient advantage of using fly ash in cement concrete:

• Reduction in heat of hydration and thus reduction of thermal cracks and improves soundness of concrete mass.
• Improved workability / pumpabilty of concrete
• Converting released lime from hydration of OPC into additional binding material - contributing additional strength to concrete mass.
• Pore refinement and grain refinement due to reaction between fly ash and liberated lime improves impermeability.
• Improved impermeability of concrete mass increases resistance against ingress of moisture and harmful gases result in increased durability.
• Reduced requirement of cement for same strength thus reduced cost of concrete.

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