Overview
Fly ash is a by-product of coal-fired power plants; ground granulated blast-furnace slag (GGBFS) is a by-product of iron making. Used in the right proportions, they reduce heat in mass concrete, cut chloride penetration and improve sulphate resistance.
Concrete with fly ash or slag gains strength more slowly at early ages, so curing must be longer and formwork stripping planned accordingly. Fly ash sources need consistent loss on ignition and fineness.
Uses
- 01Mass concrete and raft foundations
- 02Marine and infrastructure concrete
- 03Low-carbon concrete for green projects
- 04Mortar and non-fired blocks
Selection and acceptance checks
- Check fly ash class (F, C) and loss on ignition
- Trial mixes for replacement rate and strength by age
- Extend moist curing as specified
Reference standards
- ASTM C618
- ASTM C989
- TCVN 10302:2014
- EN 450-1
For reference only. The standards for each project follow its design documents, current Vietnamese codes and the investor’s requirements.
Sectors and solutions
Sectors
Infrastructure Energy High-rise buildings
