Typical Physical Properties of Steel Slag

Property Value

Specific gravity 3.2-3.6

Air-cooled copper slag has a black color and glassy appearance. As a general rule, its specific gravity will vary with iron content, from a low of 2.8 to as high as 3.8.21 The unit weight of copper slag is somewhat higher than that of conventional aggregate. The absorption of the material is typically very low (0.13%).22

Granulated copper slag is more porous and therefore has lower specific gravity and higher absorption than air-cooled copper slag. The granulated copper slag is made up of regularly shaped, angular particles, mostly between 4.75 mm (3/4 in.) and 0.075 mm (No. 200 sieve) in size.

Granulated nickel slag is essentially an angular, black, glassy slag, with most particles in the size range of —2mm (No. 10 sieve) to +0.15 mm (No. 100 sieve).21 It is more porous, with lower specific gravity and higher absorption than air-cooled nickel slag.

Slags from lead, lead-zinc, and zinc groups are often black to red in color and glassy. They have sharp, angular particles that are cubical in shape. The unit weights of lead, lead-zinc, and zinc slags are somewhat higher than conventional aggregate materials. Granulated lead, lead-zinc, and zinc slags tend to be porous, with up to 5% absorption.23 The specific gravity can vary from less than 2.5 to as high as 3.6.21,23 These slags are made up of regularly shaped, angular particles, mostly between 4.75 mm (3/4 in.) and 0.075 mm (No. 200 sieve) in size.

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