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Blast furnace slag is the non-metallic product consisting essentially of silicates and aluminosilicates of calcium and other bases that is developed in a molten condition simultaneously with iron in a blast furnace.
Granulated blast furnace slag (GBFS) is a glassy, granular material.
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Molten slag is passed through high volume water sprays, breaking the slag stream up into small droplets and cooling them so quickly that crystallisation is suppressed.
Civil grade granulate is a coarse sand-like material with a porous, amorphous structure and ranging from white to golden brown in colour. Reject granulate may contain large lumps and iron contamination.
- Roadbase stabilisation
- Water treatment
- Civil fill
- Reprocessing into commercial products
- Cementitious properties
- Low chloride content
- Cost effective
- Effective utilisation of an industrial by-product
- Conserves natural resources and preserves natural landscape
- Reduces the need for landfill sites
PDS-GBF007 : Rev 4 : 16/03/10
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Blast furnace slag is composed of silicates and aluminosilicates, but for ease of reporting oxide equivalents are used and fall within the relatively narrow limits given below. Reject granulate is likely to contain high and variable quantities of metallic iron:
| CONSTITUENT |
SYMBOL |
%
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| Iron Oxide |
FeO |
2 |
| Calcium Oxide |
CaO |
38 - 43 |
| Silicon Dioxide |
SiO2 |
32 - 37 |
| Aluminium Oxide |
Al2O3 |
13 - 16 |
| Magnesium Oxide |
MgO |
5 - 8 |
| Titanium Dioxide |
TiO2 |
1 |
| Chloride Ion |
Cl |
<250 ppm |
Bulk Density
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(Loose) |
0.85 - 1.05 t/m3
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Glass Content
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>85%
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Angle of Repose
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Approx. 35° |
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