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Science Weekly

Concrete without CO2: can our biggest building material go green?

May 28, 2024
Julian Allwood, a Professor at the University Of Cambridge, discusses reducing carbon emissions in concrete production by recycling old cement to create new Portland cement. The innovative process also helps in steel recycling and promotes sustainable construction materials.
14:53

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Podcast summary created with Snipd AI

Quick takeaways

  • Recycling old cement in steel production reduces emissions and creates new Portland cement.
  • Innovative methods like cement recycling offer sustainable solutions for reducing CO2 emissions in construction industry.

Deep dives

Challenges of Cement Production

Concrete, a widely used substance worldwide, poses a significant challenge due to its production process centered around cement. Cement, a key ingredient in concrete, is responsible for a substantial portion of global CO2 emissions, rivaling major countries like the US and China. Efforts to reduce emissions in the cement industry have included alternative fuels and supplementary materials, such as fly ash and blast furnace slag, but limitations persist as these sources may deplete over time.

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