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Block Blend
pdf_buttonProduct Code GAB780

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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PROCESS

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.


DESCRIPTION

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


APPLICATIONS

  • Aggregate for concrete block manufacture

ADVANTAGES
  • Cementitious properties
  • Interlocking particle shape
  • Well graded
  • Resistant to weathering
  • Resistant to heat and fire
  • Dependable quality
  • Lower unit weight
  • Lower transport costs

ADVANTAGES IN CONCRETE BLOCKS
  • Favourable strengths
  • Superior bond
  • Fire resistance
  • Thermal insulation
  • Sound absorption and insulation
  • High durability
  • Economical mix designs
  • Lightweight
  • Light colour
  • Textural beauty
  • Sawability
  • Nailability

ENVIRONMENTAL VALUE

  • 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

 
CHEMICAL PROPERTIES

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

TYPICAL GRADING
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


TYPICAL PHYSICAL PROPERTIES
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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TECHNICAL SERVICES AND CUSTOMER ENQUIRIES
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Australian Steel Mill Services Pty
21 Processing Area
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PORT KEMBLA NSW 2505

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