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The environmental impact of concrete, its manufacture, and its applications, are complex, driven in part by direct impacts of construction and infrastructure, as well as by CO 2 emissions; between 4-8% of total global CO 2 emissions come from concrete. [1] Many depend on circumstances.
By using this form of concrete, companies can reduce their emissions by 3% to 5%. CarbonCure estimates it has saved around 450,000 metric tons of CO 2 to date. Read More: How Cities Are Clamping ...
Cemex, North America’s biggest concrete producer, has vowed to slash carbon dioxide emissions by 40% before 2030 and to eliminate them by 2050, ambitious goals reflecting growing pressure on the ...
A 2021 study focused on "carbon-intensive hotspot materials (e.g., concrete foundations and slab floors, insulated roof and wall panels, and structural framing) in light industrial buildings" estimated that a "sizable reduction (~60%) in embodied carbon is possible in two to three years by bringing readily-available low-carbon materials into ...
Concrete, the most used building material globally, accounts for 5% of global annual CO2 emissions due its carbon-extensive production process. [4] In 2023, global carbon emissions were 36.8 billion tons [ 5 ] meaning the concrete construction industry alone emitted 1.84 billion tons of CO2 in 2023, more than most countries besides China, the ...
When atmospheric carbon dioxide (CO 2), or carbonate ions (HCO − 3, CO 2− 3 dissolved in water) diffuse into concrete from its external surface, they react with calcium hydroxide (portlandite, Ca(OH) 2) and the pH of the concrete pore water progressively decreases from 13.5 – 12.5 to 8.5 (pH of water in equilibrium with calcite).
A 2002 study compared production energy values for building components (e.g. walls, floors, roofs) made predominantly of wood, steel and concrete, and found that wood construction has a range of energy use from 185 to 280 Gigajoules (GJ), concrete from 265 to 521 GJ, and steel from 457 to 649 GJ.
There are nevertheless a number of definitions of zero carbon housing, particularly concerning the scope of emissions in the housing lifecycle (eg construction vs operation or refurb), and whether it is acceptable to count off-site emissions reduction (eg due to renewable energy export) or other external reductions against any residual emissions from the house to make it a Net Zero Home.
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