Coal ash is a byproduct of coal-fired power generation and industrial processes, and its effective use is becoming increasingly important in South Africa. This overview from the South African Coal Ash Association (SACAA) explains what coal ash is, how it is produced, and why it has growing value in construction and infrastructure applications. As pressure increases to manage waste more sustainably, the focus is shifting toward finding beneficial uses for ash materials. The article highlights how fly ash and bottom ash can be repurposed to improve concrete, stabilise soils, and support civil engineering projects, turning a waste stream into a valuable resource.
Key Insights / Summary
Key Topics Covered:
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Coal ash is produced when coal is burned in power stations and industrial processes
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Fly ash is a fine, cement-like material with pozzolanic properties
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Widely used to improve concrete strength and durability
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Suitable for road construction, embankments, and structural fill applications
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Fly ash has low compressibility and reduces settlement in construction projects
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Bottom ash and boiler slag make up 10–15% of coal combustion products
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Bottom ash is used in asphalt, structural fills, and agricultural applications
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Increasing focus on beneficiation and sustainable reuse of ash
Applications
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Concrete and cement enhancement
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Road construction and asphalt binders
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Structural fills and embankments
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Agricultural soil applications
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Civil engineering and infrastructure development
Related Resources
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Ash Beneficiation Research in South Africa: Eskom Case Study & Industrial Applications
- Ash in Soil Amelioration: Improving Soil Health with Fly Ash Applications
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Fly Ash in Cement Manufacturing: Performance, Standards & Optimization
