Granulated Blast Furnace Slag (GGBFS), otherwise known as
slag, is a by-product of the steel and iron industry which is
milled to a fine consistency. Slagment is the
registered trade name of our Ground Granulated Blast Furnace Slag
(GGBFS). It is a latent hydraulic binder that is used in concrete
and other construction applications as a partial cement replacement
material. We have the capacity to produce over 800 000 tons of slag
per year at our Slagment operation in Vanderbijlpark.
Architectural and Engineering Benefits
Slag offers a
number of benefits when used in construction. These include:
Slag is known to produce durable concrete. A key characteristic of
slag is that it possesses self-cementing properties. It’s been
found that slag can double the lifespan of buildings.
It is a latent hydraulic binder commonly used in concrete and
also serves as a partial cement replacement material in construction.
It is also a direct replacement for ordinary Portland cement by
It is usually used as an optional additive to cement and
Its main function is to increase durability and workability.
It can be used together with lime and/or cement to stabilise soil
prior to road construction.
It provides protection from both chloride and sulphate attack.
It reduces the thermal heat gradient generated when pouring the
concrete and in the process reduces the likelihood of micro
cracking which may tend to weaken the structure’s strength.
It can alter the colour of concrete to a near-white colour by
replacing 50-70% of the concrete, giving the concrete a better
It also produces a smoother more defect free surface.
Operations and Capacity
Our plant in
Vanderbijlpark has the capacity to produce over 800 000 tons of
slagment and over 200 000 tons of blended cementitious products
per year. We’ve produced slag for over 50 years, contributing
to the construction of major structures such as dams, bridges and
We produce a
number of different slag products including custom-made products such
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
designed for use with classified or unclassified mine tailings in
backfill systems in deep level mining.