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.

Air-cooled blast furnace slag is a predominantly crystalline, solid rock-like material. Basalt is a fine-grained volcanic rock type.

DESCRIPTION Air-cooled slag is dug, crushed, screened and mechanically blended with basalt fines to form DGB20 Slag/Basalt Roadbase. The fine aggregate portion is predominantly basalt fines. APPLICATIONS High quality (flexible) roadbase conforming to RTA Specification 3051 ADVANTAGES Interlocking particle shape Ease of compaction Lower tonnage required per cubic metre Effective utilisation of an industrial byproduct conserving natural resources TYPICAL GRADING SIEVE % PASSING 26.5 mm 100 19.0 mm 95-100 13.2 mm 70-90 6.7 mm 50-70 2.36 mm 30-55

TYPICAL PHYSICAL PROPERTIES Attribute Typical RTA 3051 Maximum Dry Density   2.0-2.1 t/m3   Optimum Moisture   10-11%   Misshapen Particles (2:1)   5-15% 35% max Dry Strength   100-130 kN   Wet Strength   85-115 kN 70kN min Wet/Dry Variation   5-20% 35% max Fine Particles Size Distribution A Ratio 40-50% 35-55%   B Ratio 45-55% 35-55%   C Ratio 40-50% 35-60% Liquid Limit   n/a 20% max Plastic Limit   n/a 20% max Plasticity Index   non-plastic 6 max Dry Compressive Strength   4-5 MPa 1.7 min   PDS-RBU100 : Rev 5 : 16/03/10

TECHNICAL SERVICES AND CUSTOMER ENQUIRIES Marketing Department Australian Steel Mill Services Pty 21 Processing Area Springhill Road PORT KEMBLA NSW 2505 Telephone: 02 4255 1125 Facsimile: 02 4276 2369