Railway ballast stone in South Africa is a crucial component of rail track construction, providing stability, drainage, and load distribution. Here’s an overview of its characteristics, sources, and suppliers:
1. Specifications of Railway Ballast in South Africa
– Material: Typically hard, durable igneous rock (e.g., granite, dolerite) or quartzite.
– Size: Usually 19–50 mm (as per Transnet Freight Rail or PRASA standards).
– Shape: Angular to ensure interlocking and stability.
– Quality: Must be free from dust, clay, or organic material to prevent track degradation.
2. Major Sources & Quarries
South Africa has abundant high-quality rock suitable for ballast. Key regions include:
– Gauteng/Mpumalanga: Dolerite and granite quarries.
– Limpopo: Granite and quartzite.
– Eastern Cape/Western Cape: Quartzite and hornfels.
3. Key Suppliers & Contractors
Some leading suppliers of railway ballast in South Africa include:
– LafargeHolcim (Aggregate division)
– AfriSam (Crushed stone aggregates)
– Raubex Group (Infrastructure materials)
– NPC Crushing (Specializing in rail ballast)
– Transnet-approved quarries (Direct supply for state rail projects)
4. Standards & Regulations
Ballast must comply with:
– Transnet Technical Specifications (TFR)
– South African National Standards (SANS 1083)
– PRASA Guidelines for passenger rail networks.
5. Challenges & Considerations
– Transport costs can be high due to the weight of ballast.
– Some regions face shortages of suitable rock .jpg)
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– Environmental regulations require sustainable quarrying practices.
6. Alternative Materials
Research is ongoing into recycled materials (e.g., slag or concrete waste), but traditional stone remains dominant due to durability.
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