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 Slagment, also known as slag cement, GGBS or GGBFS (ground granulated blast furnace slag), is a latent hydraulic binder that is used in concrete and other construction applications as a partial cement replacement material.
It is a by-product of the steel and iron industry, which is dried and ground down to a fine powder. The application of slagment is primarily used as an optional additive to cement and concrete mixes, with a primary function of increased durability and workability. Slagment is also used in the stabilisation of soil prior to road construction, sometimes on its own, but more often in conjunction with lime and/or cement.
Our Slagment business unit has produced slag from our plant in Vanderbijlpark over the last 50 years, for the construction of major structures, including buildings, dams, bridges, roads and water retaining structures.
The operation has the capacity to produce in excess of 800 000 tons of slagment as well as over 200 000 tons of blended cementitious products per annum.
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A key characteristic of slag is that it possesses self cementing properties. Research has found that slagment has the capability to double the lifespan of buildings. It is a direct
replacement for ordinary Portland cement by weight and typically 40 to 50 percent
replacement is used.
There are a number of architectural and engineering benefits to adding slag to the mix. Slag
can improve certain characteristics of the concrete namely appearance, durability and
strength.
Slagment can alter the colour of concrete to a near-white colour. This can be
achieved by using 50 to 70 percent replacement levels, up to a maximum of 85 percent
replacement. The high slag content also produces a smoother more defect free surface.
Slagment has the ability to provide protection from both chloride and sulphate attack as well as reduce the thermal gradient generated when pouring the concrete. This will in turn reduce the likelihood of micro cracking which would reduce the structures strength. Slag enhances the strength due to the fact that it has a high proportion of calcium silicate hydrates.
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| We produce a number of different Slagment products including the following cutom-made products: |
- A binder used for backfill in the mining industry, generally for cut-and-fill or room-and-pillar backfilling where high early strength gain is not required.
- A binder designed for use with classified or unclassified mine tailing in backfill systems in deep level mining.
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| Our value proposition to our customers (pdf 78kb) |
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| Industry Bodies |
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Cement and Concrete Institute (C&CI) – www.cnci.org.za
The Cement and Concrete Institute (C&CI) is a marketing organisation that aims to grow the market share for concrete providing information (publications, a website, advice), technical and consulting services, research & development, education & training, market services and regulatory guidelines.
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