The Problem With Concrete
Concrete is responsible for 8% of humanity’s carbon emissions because making its key ingredient - cement - chemically releases CO2, and because we burn fossil fuels to make it happen.
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Show Notes
To learn more about this topic, start your googling with these keywords:
- Portland cement - the most common type of cement used worldwide, made with limestone
- Limestone - a hard sedimentary rock, composed mainly of calcium carbonate (which is also in shells & eggs)
- Cement - a powder used in construction that’s made by grinding clinker with other minerals and mixing with water to form a paste that sticks to sand, gravel or crushed stone to make concrete
- Concrete - a building material made by mixing cement with water to form a paste that gains body through fillers like sand and gravel
- Clinker - an intermediate marble-sized product in cement production created by sintering limestone with clay and other things
- Sinter - to turn a powdery solid into a single mass by heating it without liquefaction
- Mortar - another building material (used to adhere bricks or stones together) made by mixing cement with water and sand
- Calcination - the process of heating a substance to a high temperature, but below its melting point, so it thermally decomposes (like limestone into lime & CO2)
- Process emissions - the name for the CO2 that comes from limestone when it thermally decomposes
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