Slag Aggregates

By-products of the steel and iron industries, slag aggregates have many valuable properties that can be used in construction, infrastructure and agriculture. At Tarmac we have over 40 years experience of processing slag into premium and more sustainable construction materials.

Today, approximately four million tonnes are processed every year at our strategically located units across the UK. A direct alternative to primary aggregates, slag aggregates offer versatility and most importantly sustainable solutions to standard construction products.

Advantages over traditional aggregates

Manufacturing
Steel aggregates have a high abrasion and crushing resistance for road applications: air cooled blast furnace products bond particularly well to cement and bitumous binders. They also offer significant environmental benefits such as the reuse or recycling of material and the avoidance of the need to quarry natural aggregates.

Agriculture
In agriculture, slag aggregates (Ag-Slag) have been used as an agricultural liming material since the 1920's in all types of crop production and landscaping. The materials are used to:

• Maximise yields of cultivated crops and pasture

• Improve soil texture

• Neutralize high soil acidity.

Concrete
In concrete, processed steel and blast furnace slag provide a sustainable alternative to primary aggregates in the production of lightweight or dense ready-mixed concrete. Blast furnace slag can also be used to make Ground Granulated Blast-furnace Slag (GGBS) which is used as a cement replacement in concrete.

Blast Furnace Slag

Blast Furnace Slag

Formed during the manufacture of iron, molten blast furnace slag is cooled and processed in three ways to form slag aggregates for different applications.

Slag Aggregate in Agriculture

Slag Aggregate in Agriculture

Tarmac AgSlag is a high quality, calcium rich product providing essential nutrients to soils in a slow release form.

Steel Slag

Steel Slag

Steel slag is produced during the steel making process where, after air cooling, a dense rock material is processed and sized into specific products suitable for diverse applications.

Slag Aggregates in Asphalt

Slag Aggregates in Asphalt

An ideal aggregate for base, binder and surface course asphalt products, the inherent properties in steel slag are assessed in accordance with the requirements of the European standard EN 13043 and can produce asphalt materials exhibiting superior properties to those manufactured with primary aggregate.

Slag Aggregates in Concrete

Slag Aggregates in Concrete

Slag aggregates are now often preferred in specification as they are recognised to be a valuable material supporting versatile performance qualities.

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