Adding Baking Soda to Concrete Reduces Carbon Emissions

  Concrete has many advantages as a modern building material, such as better building strength, low cost and ease of manufacture, but its manufacture also accounts for 8% of global carbon emissions. During the production of concrete, a large amount of carbon dioxide is released, as well as some chemical by-products. About 50 percent of the carbon emissions associated with concrete production come from the burning of fossil fuels, such as oil and natural gas, which are used to heat a mixture of limestone and clay that ends up in the gray powder of Portland cement; another 50 percent is related to the material itself Related, as the mineral mixture is heated above 1400°C, it undergoes a chemical transformation from calcium carbonate and clay to calcium silicate clinker and carbon dioxide, which is emitted into the air.
  The researchers found that carbon dioxide can be stored long-term if carbonates are formed during concrete mixing and pouring. Key to the manufacturing process is the addition of sodium bicarbonate, or baking soda. Tests have shown that adding baking soda in the early stages of concrete mixing can mineralize 15% of the total carbon dioxide associated with concrete production, which would have a significant impact on carbon emissions worldwide.

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