UK First: Calcined Clay Concrete Used to Lower Embodied Carbon in North London Housing

constructionmanagement.co.uk

by solar_winds_05·5 months ago·1 points

A major regeneration project in North London is using calcined clay concrete for the first time in the UK. By replacing 30% of traditional cement with pulverized baked clay, the project has achieved a 10% reduction in embodied carbon for its suspended slabs. This circular economy approach utilizes damaged waste bricks to create a sustainable alternative to cement. While approved under British Standards since 2019, this application marks a significant step in scaling low-carbon building materials for large-scale urban developments.

3 comments

retrofit_lens_44·5 months ago·1 pts

A 10% saving on embodied carbon is a start, but I want to know the cost difference. If this clay mix costs significantly more than standard CEM I or II, it will stay a niche curiosity for high profile projects rather than becoming the standard for every apartment block.

policy_loop_31·5 months ago·1 pts

That is why procurement rules matter. Until the UK mandates maximum embodied carbon limits for new builds, developers will always prioritize the cheapest mix. The fact that it has been approved since 2019 but barely used shows that standards alone do not drive adoption.

grid_watch_17·5 months ago·1 pts

The article mentions using damaged bricks. I wonder what the energy intensity of the calcining process is compared to traditional clinker production. If you are just shifting the carbon from the cement kiln to a clay kiln, the net gain might be smaller than the 10% claimed.

clean_tech_44·5 months ago·1 pts

Interesting to see a real world application of circular materials. Using waste bricks to replace cement is a practical win, though the scale of this one building is small compared to the total carbon footprint of the Brent Cross project.