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room temperature, but this method must be studied in-depth. Self-curing geopoly-
mer concrete could be produced by partially replacing OPC. Perhaps an appropriate
combination of SS, fly ash/metakaolin and OPC should be studied to optimise the
geopolymerisation process (Bignozzi et al., 2013).
Finally, other alternatives should be tested, such as the use of SSSs, in order to
make the more widespread use of geopolymers possible.

7.5 Concluding remarks

The use of slag in concrete represents an environmental benefit since it reduces the
volume of waste generated by the steel industry and, at the same time, means that
fewer natural resources are required for the manufacture of any type of concrete. In
particular, BF slags are widely used and recognised by standards in both cement
and aggregate manufacturing. Other types of slag that have shown to be better than
natural aggregates in many aspects do not adhere to regulations. Numerous research
has shown the validity of EAFSs when they have been adequately inerted.
Therefore, slags are a potential alternative to use for more sustainable concrete.

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