Fig. 1: Conceptual representation of clinker and cement substitution.

Substitution in the cementitious binder, and in mortar and concrete (product scale, top left), is linked in several important ways to the wider industrial system (market scale, a–g). g Clinker can be substituted by secondary cementitious materials (CMs) from the (a) minerals, (b) built environment, (c) agriculture, (d) forestry, (e) metals, and (f) energy sectors.