Slag is a byproduct of iron and steel production. During the process of making iron and steel, impurities are separated and form a molten liquid called slag. This liquid is then cooled and processed for various uses, including in the cement industry.
Types of Slag
The two main types of slag are:
Iron slag: Produced during the production of pig iron in a blast furnace.
Steel slag: Produced during steel production.
Uses of Slag
Slag has several applications, including:
Cement production: Slag, particularly ground granulated blast furnace slag (GGBFS), is used as a partial substitute for Portland cement in concrete mixes. It enhances concrete strength, durability, and resistance to chemical attack.
Aggregates: Air-cooled iron slag and steel slag can be used as aggregates in concrete and asphalt paving, as well as for fill and road bases.
Other applications: Slag can also be used as a feed material for cement kilns.
Benefits of Using Slag in Cement
Using slag in cement production offers several benefits:
Improved concrete properties: Slag can enhance the strength, durability, and workability of concrete.
Reduced carbon footprint: Slag reduces the amount of Portland cement needed, lowering the overall carbon footprint of concrete production.
Resource efficiency: Using slag, an industrial byproduct, reduces waste and conserves natural resources.
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