
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 (GBF) slag is a glassy granular product whereas air-cooled blast
furnace slag is a predominantly crystalline, solid rock-like material.
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Formation
of air-cooled slag occurs when molten slag is either run directly into pits
adjacent to the furnace or into pots, then tipped into bays and allowed to
solidify under atmospheric conditions.
Granulated slag is produced by rapid quenching of molten slag using high
volume water sprays and is blended by mass with air-cooled slag crusher fines
in 78/22 proportions to form Block Blend.
Block Blend is a coarse sand-like material consisting of angular to roughly cubical
shaped particles with a characteristically vesicular structure and rough surface
texture
- Aggregate for concrete block manufacture
- Cementitious properties
- Interlocking
particle shape
- Well graded
- Resistant
to weathering
- Resistant to heat and fire
- Dependable quality
- Lower unit weight
- Lower transport costs
- Favourable strengths
- Superior bond
- Fire resistance
- Thermal insulation
- Sound absorption and insulation
- High durability
- Economical mix designs
- Lightweight
- Light colour
- Textural beauty
- Sawability
- Nailability
- Effective utilisation of an industrial by-product
- Conserves natural resources and preserves natural landscape
- Reduces the need for landfill sites
- Reduces energy consumption
PDS-GAB780 : Rev 3 : 06/01/97
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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:
| CONSTITUENT |
SYMBOL |
%
|
| Iron Oxide |
FeO |
<1.3
|
Calcium Oxide
|
CaO
|
38 - 43
|
Silicon Dioxide
|
SiO2
|
32 - 37
|
Aluminium Oxide
|
Al2O3
|
13 - 16
|
Magnesium Oxide
|
MgO
|
5 - 8
|
| Titanium Dioxide |
TiO2
|
<1.5
|
Manganese Oxide
|
MnO
|
<1.0
|
Potassium Oxide
|
K2O
|
<1.0
|
| Sulphur |
S
|
<1.0
|
Sodium Oxide
|
Na2O
|
<0.5
|
Level of soluble salts are low as shown below:
Chloride Ion
|
Cl
|
<500 ppm
|
| Sulphates |
SO3
|
<1000 ppm
|
| SIEVE |
% PASSING
|
| 9.5 mm |
100 |
| 6.7 mm |
98 - 100
|
| 4.75 mm |
95 - 100
|
| 2.36 mm |
85 - 95
|
| 1.18 mm |
60 - 75
|
| 600 um |
25 - 40
|
425 um
|
15 - 30
|
| 300 um |
5 - 20
|
| 150 um |
0 - 10
|
| 75 um |
0 - 5
|
| Bulk Density |
(Loose)
|
1.00-1.20 t/m3
|
| |
(Compacted)
|
1.20-1.30 t/m3
|
Particle Density
|
(Dry)
|
2.30-2.40 t/m3
|
| |
(SSD)
|
2.40-2.50 t/m3
|
| Water Absorption |
|
3-6%
|
Material Finer than
|
75um
|
<2.5%
|
| |
2um
|
<0.5%
|
Sodium Sulphate Soundness
|
|
<2%
|
Alkali Reactivity
|
|
Innocuous
|
Organic Impurities
|
|
Free
|
Sugar
|
|
Free
|
pH
|
|
10-12 |
Glass Content
|
|
70-80%
|
Angle of Repose
|
|
Approx. 35°
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21 Processing Area
Springhill Road
PORT KEMBLA NSW 2505
Telephone: 02 42551125
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