Cement Production Accounts for 6-7% Human Produced CO2 Carbon Emissions
Cement From Trash: Green Alkali-Activated Cements That Cut CO2 by 95%
By: Alex Moseson, Drexel University
Alkali-Activated Cements could cut global CO2 production by 5%, but some challenges stand in the way. Find out what we're doing about it.
This cement alternative absorbs CO2 like a sponge
Environmental chemist David Stone was seeking a way to keep iron from rusting when he stumbled upon a possible substitute that requires significantly less energy.
CO2-absorbing cement ‘far superior than Portland cement’
Founded in 2012 by Brent Constantz, PhD, Stanford Biodesign, the company Blue Planet is capturing carbon dioxide of large emitters like fossil fuel or coal power plants but also from Portland cement plants.
Calcium carbonate cement replacement has "far superior" properties than Portland cement.
Blue Planet also produces an artificial limestone for asphalt, cement and roads. The company recently received an award from the Carbon Capture Challenge in Alberta in the category of solid materials for carbon capture.
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Next to water, concrete is the second-most consumed substance on earth; on average, each person uses nearly three tonnes a year. Portland cement, the major component of concrete, is used to bind the materials that make up concrete.
* The concrete industry uses about 1.6 billion tonnes of Portland cement and produces some 12 billion tonnes of concrete a year.
The industry has a large ecological footprint: it uses significant amounts of natural resources such as limestone and sand, and depending on the variety and process, requires
* 60-130 kg of fuel oil and 110 kWh of electricity to produce each tonne of cement.
* The cement industry is second only to power generation in the production of CO2.
* Producing one tonne of Portland cement releases roughly one tonne of CO2 to the atmosphere, and sometimes much more.
* The cement industry accounts for 7-8 per cent of the planet’s human-produced CO2 emissions.
* Half of it comes from producing clinker (the incombustible remains of coal combustion),
* 40 per cent from burning fuel and
* 10 per cent from electricity use and transportation
(Mahasenan and others 2003, WBCSD 2005).
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