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Mined limestone is needed to make cement, a crucial component of concrete. Microalgae are currently being used in place of limestone by experts. By removing carbon dioxide from the atmosphere, the addition of this biogenic limestone can render concrete carbon neutral or even negative in terms of carbon emissions.
The biogenic limestone can take the place of limestone extracted from quarries by producing calcium carbonate through photosynthesis. Engineers from all over the nation are working to make that production process, which is responsible for over 7% of the yearly greenhouse gas emissions in the world, carbon neutral or even carbon negative.
The Global Carbon Negative Concrete Market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
One potential solution is carbon-negative concrete, which is being developed by a company by the name of CarbiCrete. Cement is the main component of concrete; it is a sophisticated compound composed of calcium, silicon, aluminium, iron, and other materials. These are heated to 2,700 degrees Fahrenheit, which triggers a chemical reaction in which some elements burn off and the surviving ones turn to powder. In order to generate the energy and heat necessary to achieve such high temperatures, coal or natural gas must be burned.
In addition, the chemical reaction between the cement compounds and water creates carbon dioxide (CO2).When water is added to a mixture of cement powder and aggregate materials like sand and gravel, a chemical reaction occurs that causes the entire mixture to harden.
The mixture then takes about a month to reach its maximum strength. In a few instances, CarbiCrete differs from the norm. To begin with, steel slag has completely supplanted the cement that was previously used.
Slag is the residue left over after extracting iron from iron ore to produce steel. It is a byproduct of the metal-making process. Slag is frequently used in building as an aggregate, most frequently for paving roads.Because CarbiCrete uses CO2 gas from industrial vents in its absorption chambers, the business is carbon-negative rather than carbon-neutral. As a result, they sequester some of the CO2 that has been removed from the environment rather than producing it from scratch.
