2. July 2020

In the series of “CBI presents”, the project Alternative Binders will be presented next.

As in all areas of society, the climate debate is also a focus of attention in the construction industry. As a result, the cement industry is more than ever in the focus of public attention concerning its poor CO2 balance, which is mainly driven by the process of clinker production. The economic efficiency could be significantly worsened by a monetary assessment of CO2 emissions. For this reason, efforts have been underway for many years to use industrial by-products (fly ash, slag sand, etc.) as clinker substitutes.

The project aims to identify alternative binders that have no or only a small proportion of clinker and have the potential to protect an embedded, possibly galvanized, steel reinforcement against corrosion. The economic and marketing advantages of “eco-concrete” are to be made technically usable for the selected products.

Even with a closed evaluation of the general usability of binder combinations, the normative record of “ecological concrete” is still far from being established. The basis for evaluating the performance of individual systems already exists today. This means that, in principle, the technology can be applied when testing the following aspects:

– Possibility of passivation of the steel reinforcement in the selected binder
– Durability of passivity against the background of the intended exposure (carbonation, chlorides).

The aim is to identify commercially available alternative binders with no or only a low clinker content, which are available in sufficient quantities and reproducible quality and which have the potential to protect an embedded steel reinforcement against corrosion. Here, the durability has to be evaluated against the background of the respective intended exposure (dry interior, marine infrastructure). The aim is to make the economic and marketing advantages of “eco-concrete” technically usable for selected products.

CBI would like to take this opportunity to thank the companies for their productive participation!