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Unhydrated cement recycling


Technology Description

In the process of concrete curing, some portion of cement does not come in contact with water and is left unhydrated (some estimates suggest that up to 50% of cement could remain unhydrated). New concrete crushing technologies are under development that would enable recovering this unhydrated cement from end-of-life concrete for direct reuse as new cement.

Relevance for Net Zero

This technology could reduce the need for new cement production. However, there may be behavioural barriers to its widespread use, and given the long lifetimes of concrete structures it is unlikely to come close to replacing a large portion of cement demand. It is also unclear what portion of unhydrated cement it is possible to recover from concrete.

Key Countries


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