Back to Glossary
Concrete & Masonryaka: Class C fly ashaka: Class F fly ashaka: SCMaka: pozzolan

Fly Ash

In Plain English

A recycled industrial byproduct used to replace a portion of cement in concrete, improving its properties and sustainability.

Definition

A byproduct of coal combustion at power plants, used as a supplementary cementitious material (SCM) to partially replace Portland cement in concrete mixes. Class C fly ash has cementitious properties; Class F fly ash is primarily pozzolanic. Using fly ash reduces cement content, lowers heat of hydration, improves workability, and can enhance long-term strength and durability.

Example

The green building specification required 30% fly ash cement replacement to reduce the project's carbon footprint.

Related Terms

Frequently Asked Questions

Need more than definitions?

Get AI-powered bid alerts, automated form filling, and proposal drafting.

Start Free Trial

© 2026 ConstructionBids.ai — A LaderaLabs Product