Fly Ash

Definition

Fly ash is a byproduct from burning coal, often supplemented with cement in making concrete.

Purpose

The purpose of using fly ash in concrete is to enhance its strength, durability, and workability. It also helps in reducing the environmental impact by recycling industrial waste.

Examples of Use

• Fly ash is used in constructing roads, bridges, and buildings to improve the quality and sustainability of concrete.
• In green building practices, fly ash is a key component for achieving LEED certification.

Related Terms

• Pozzolan: A siliceous material that, when mixed with lime and water, forms a cementitious compound.
• Portland Cement: The most common type of cement used in concrete production.
• Slag Cement: A byproduct of steel production, used similarly to fly ash to enhance concrete properties.

Notes

Fly ash can improve concrete's resistance to sulfate attack and reduce the heat of hydration, which is beneficial for large-scale pours.