Having many meanings; Green concrete could be; freshly placed concrete, because it usually has a green hue when it is curing, or colored concrete because we can easily add green or any other shade to concrete.
But for today, green concrete is going to be environmentally friendly concrete.
During the production phases of concrete, Green concrete is another name for resource-saving concrete. Concrete that has a reduced environmental impact with regard to energy consumption and emissions in its manufacturing, and the amount of waste water and CO2 generated. Green concrete can often also be less expensive to produce, because waste products are used as a partial substitute for cement, landfill taxes are avoided, energy consumption in production is lowered, and durability is improved.
Another way of looking at green Concrete is the way it performs and its characteristics as a chic new floor finish material. Providing a low-maintenance, smooth surface that won't off gas unhealthy volatile organic compounds (VOCs) or collect allergens, and with the help of low-VOC sealants and polishes, concrete floors keep a water-resistant, attractive shine. They can also be tinted, patterned or even stamped to look like natural stone or tile.
In its production of "Green" concrete, it should contain at least 20 percent fly ash, a waste product from coal-burning power plants; its production results in less CO2 pollution. Concrete also can be mixed with blast-furnace slag, cinders or recycled crushed concrete, giving your contractor more eco-friendly options. Under direct sunlight, concrete acts as a "thermal radiator" and can absorb and release heat supplied by the sun.
As Maria Juenger, civil engineering assistant professor at The University of Texas at Austin states.
"More than six billion tons of concrete are produced annually-about one ton per person on the planet. Concrete is made from cement, water, sand and gravel. The cement is made by heating raw materials such as limestone and clay to very high temperatures until they chemically react. This process uses massive amounts of energy (about five percent of the world's use per year) and releases about a ton of carbon dioxide per ton of cement made."
Juenger proposes to make cement out of waste materials instead of new materials to reduce the carbon dioxide emitted and energy used for production. One such waste material is fly ash, a byproduct of the coal-burning industry. Fly ash is already used in concrete as a cement substitute and has a composition similar to cement.
"Anything we can do to make concrete more environmentally friendly will have a big impact," says Juenger, "simply because it's the world's most used material."
Watch a related video on Sustainable Living Building Green For Life.
Other Green Concrete Articles:
Green Concrete Building for Sustainability
Eco Concrete: A Green Building Material
GFRC Concrete Countertops