Fly Ash Class C Supplementary Cementitious Material
CAS Number: 93821-59-1
Class C fly ash is a high-calcium by-product of coal combustion that exhibits both pozzolanic and self-cementitious properties. Used at 15–40% replacement of cement, it improves workability, reduces heat of hydration, enhances long-term strength, and contributes to sustainable construction by replacing a significant proportion of clinker. Class C fly ash is particularly valued in mass concrete, pavement concrete, and high-volume fly ash (HVFA) mixes.
Technical Specifications
| appearance | Light grey fine powder |
| loss on ignition (%) | ≤6 |
| activity index 28d (%) | ≥75 |
| SiO2 + Al2O3 + Fe2O3 (%) | ≥50 |
| fineness (% retained on 45 μm sieve) | ≤34 |
Applications
- Mass concrete in dams and large foundations
- Concrete pavement and airport runways
- High-volume fly ash (HVFA) concrete mixes
- Precast concrete products and blocks
- Geopolymer binder system applications
Key Features
- Reduces cement content by 15–40% for lower carbon footprint
- Improves workability and pumpability of fresh concrete
- Reduces heat of hydration, critical for mass concrete
- Compliant with ASTM C618 Class C and EN 450 standards
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