TED Talks Daily A concrete idea to reduce carbon emissions | Karen Scrivener
Feb 8, 2021
Concrete is the second most-used substance on Earth and a major contributor to carbon emissions. In this discussion, a researcher introduces LC3, a revolutionary type of cement that could reduce emissions by 40% if adopted widely. The conversation highlights innovative techniques to create more sustainable concrete that not only cuts down environmental impact but also enhances strength and durability. This groundbreaking approach showcases how technology can reshape construction practices for a greener future.
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Concrete's Impact
- Concrete is the second most-used substance after water, impacting the environment significantly.
- Despite large volumes used, concrete has lower emissions per ton than materials like steel.
CO2 Emissions Source
- Most CO2 emissions from cement production arise from limestone decomposition, not heating.
- This decomposition process releases calcium oxide and CO2, crucial for binding in concrete.
LC3: A Greener Alternative
- LC3, a blend of limestone, calcined clay, and cement, offers similar properties to Portland cement.
- It boasts up to 40% lower CO2 emissions due to lower calcination temperatures and reduced limestone use.