Clinker substitution is one of the main levers of our Concrete Future 2050 Net Zero Roadmap. From a current level of 0.63, the clinker to binder ratio is projected to reduce to 0.58 and 0.52 by respectively 2030 and 2050. Availability of suitable materials around the world varies now, and will into the future, because for example fly ash comes from coal fired power stations and ggbs from the steel industry’s blast furnaces and these industries are also transitioning.

In coming decades there will be increased use of ground limestone and the introduction of calcined clays to both compensate for reduced supply of fly ash and ggbs, and further reduce the clinker binder ratio. Calcined clays rely on clay deposits that are geographically spread and sufficiently abundant to meet projected demand. Whilst availability of materials can be a limitation on clinker binder ratio, client acceptance is a current barrier in fully exploiting this lever in some developed and emerging economies.

This event was an update in the calcined clays area, and discussed further engagement and actions.

Speakers include:
Claude Lorea, Cement, Innovation and ESG Director, GCCA
Karen Scrivener, Head of Construction Materials Laboratory, EPFL
Cedric de Meeus, Head of Government Affairs, Holcim