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The 7 best solutions for decarbonising cement, the world’s second most used material

Published by , Assistant Editor
World Cement,


Concrete is the second most used material worldwide, surpassed only by water. It is, quite literally, the foundation of our world. The industry is also in dire need of decarbonisation. A new report from Saoradh Enterprise Partners (SEP) identifies the strongest low carbon solutions and most investable companies.

Every year, 30 billion t of concrete are used globally. That’s almost 4 t for every person on Earth. Concrete is hugely carbon-intensive, accounting for about 8% of global CO2 emissions. Cement is the biggest and most carbon-intensive component of concrete – if the cement industry were a country, it would be the third-largest CO2 emitter behind China and the US. The demand for concrete is growing, making it one of the most crucial areas for decarbonisation.

Technology

Common suggestions for decarbonising concrete include:

  • Carbon capture, utilisation, and sequestration;
  • replacing fossil fuels with renewable energy and green hydrogen;
  • and other solutions that address the industry’s high demand for heat and energy.

But these solutions are only part of the answer. The single biggest source of carbon – about 45% of all concrete emissions – is not heat or energy but a chemical reaction called calcination that occurs during cement production. SEP’s report found that changing the mix design (essentially the concrete 'recipe') can significantly reduce emissions from calcination. According to SEP’s analysis, using a low carbon mix design in addition to renewable power sources and carbon capture can reduce carbon emissions to almost zero.

SEP identified the seven most impactful low carbon mix alternatives. Listed from smallest to largest carbon footprint:

  • Granulated blast furnace slag (GBBS)
  • Limestone calcined clay cement (LC3)
  • Fly ash
  • Portland limestone cement
  • Biochar
  • Early-stage carbon curing
  • Recycled concrete aggregate (RCA)

SEP explored each solution in-depth and performed a cost-benefit analysis, the results of which can be found in the full report. In addition, the report reviews a broad range of other cleantech solutions to mitigate the carbon footprint of the cement and concrete industry.

SEP created this report in collaboration with the Sustainable Development Solutions Network, a global initiative for the United Nations.

 

The importance of decarbonising the cement and concrete industries can’t be overstated. Concrete is all around us, and it will be a key material in the short term as we adapt and build climate-resilient infrastructure. The fact that this report identifies multiple impactful, cost-competitive low carbon solutions is great news for the future of concrete and sustainable development worldwide. – Elena Crete, Head of the SDSN Climate & Energy Program

 

Market & Companies

Low carbon cement and concrete is an incredibly lucrative opportunity for cleantech investors – estimates of the global concrete market value range from US$617 billion to over US$887 billion. The market is predicted to grow to as much as US$1.3 trillion by 2030. The global cement market is valued at about US$330 billion and is predicted to grow to almost US$500 billion by 2030.

SEP identified 87 notable startup and growth companies operating in the low carbon cement/concrete space. Of these, SEP found 24 to be most interesting to investors. The complete database of companies is available upon purchase of the full report.

Read the article online at: https://www.worldcement.com/the-americas/27072022/the-7-best-solutions-for-decarbonizing-concrete-the-worlds-second-most-used-material/

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