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On the way to zero carbon
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Uses alternative binders
Today’s precast products incorporate materials such as blast furnace slag (GGBS) from the steel industry and fuel ash (PFA) from coal-fired power stations that might otherwise go to waste. As a rule of thumb: • •
Substituting 50% of cement with GGBS = 40% less CO2; Substituting 30% of cement with PFA = 20% less CO2.
These materials can improve the environmental performance of concrete and it is now possible to specify products with over 70% replacement material. Materials like microsilica, glass, limestone powder and china clay waste can also replace Portland cement or primary aggregates.
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