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| The True Impacts of Concrete Floors | Concrete Floors     Company |
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Cement production is one of the most energy intensive of
all industrial manufacturing processes. Including direct
fuel use for mining and transporting raw materials,
cement production takes about six million Btus for every
ton of cement. The industry’s heavy reliance on coal leads
to especially high emission levels of CO 2, nitrous oxide,
and sulphur, among other pollutants.
Energy Used
Producing the roughly 80 million tons of cement used in the
US in 1992 required more than 500 trillion Btus, representing
roughly .6% of total U.S. energy for the entire year. This is
remarkable given that in dollar value cement represents only
about .06% of the US gross national product. This means that
cement production is nearly ten times as energy intensive
as our entire economy as a whole.
In some Third World countries, cement production accounts
for as much as two-thirds of total energy use, according
to the Worldwatch Institute.
Recent studies suggest that as much as 12% of all carbon emmissions
on the planet come from the mining, processing and transportation
of concrete.
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Waste Produced
Concrete produces a wide variety of pollutants, from harmful chemicals released during its mining and processing to mountains of solid waste resulting from construction, rennovation and demolition. In addition to the metals and toxins released in refining, concrete plants also consume nearly 500 gallons of water per truck per day and the alkalinity levels of this washwater is as high as pH 12. Concrete also is the largest and most visible component of construction and demolition waste. According to estimates presented in the AIA Environmental Resource Guide, concrete accounts for up to 67% by weight of waste, 53% by volume. Only 5% of concrete is recycled, and most of that is used as a highway substrate or as clean fill around buildings. |
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