Ground Granulated Blast Furnace Slag (GGBS)
CAS Number: 65996-69-2
Ground granulated blast furnace slag (GGBS) is a latent hydraulic binder obtained by quenching molten blast furnace slag in water, then grinding to high fineness. Used at 30–70% replacement of Portland cement, GGBS significantly reduces heat of hydration, improves sulfate resistance, reduces chloride permeability, and contributes to a lower carbon footprint. Long-term strength continues to develop well beyond 28 days.
Technical Specifications
| appearance | Off-white to light grey fine powder |
| activity index 7d (%) | ≥55 |
| activity index 28d (%) | ≥75 |
| CaO + MgO + SiO2 + Al2O3 (%) | ≥66.7 |
| specific surface area (m²/kg) | ≥450 |
Applications
- Mass concrete where heat reduction is critical
- Marine concrete and sulfate-aggressive environments
- High-durability concrete infrastructure
- Precast concrete products and prestressed elements
- Geopolymer concrete applications
Key Features
- Reduces CO2 footprint by up to 50% compared to pure Portland cement
- Superior sulfate resistance for aggressive soil and marine environments
- Significantly reduces chloride permeability for reinforcement protection
- Compliant with BS EN 15167, ASTM C989, and IS 12089 standards
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