Concrete vibrator produce carbon dioxide

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Artificial leaf turns sunlight, CO2 and water into synthetic gas

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5 surprising products companies are making from carbon dioxide | GreenBiz

A Canadian company says that it has developed a way for makers of precast concrete products to take all the carbon-dioxide emissions from their factories, as well as neighboring industrial facilities, and store them in the products that they produce by exposing those products to carbon-dioxide-rich flue gases during the curing process. Industry experts say that the technology is unproven but holds great potential if it works. Concrete accounts for more than 5 percent of human-caused carbon-dioxide emissions annually, mostly because cement, the active ingredient in concrete, is made by baking limestone and clay powders under intense heat that is generally produced by the burning of fossil fuels. Making finished concrete products—by mixing cement with water, sand, and gravel—creates additional emissions because heat and steam are often used to accelerate the curing process. The company takes advantage of a natural process; carbon dioxide is already reabsorbed in concrete products over hundreds of years from natural chemical reactions.
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Concrete products reabsorb nearly half CO2 released in cement manufacture

Concrete is not just the key to our built future, but a principal reason as to why we won't live to see the utopia it creates. After all, production of the building material contributes around five percent of the planet's total CO2 emissions. Thankfully, Professor Stuart Licht, the scientist who's already worked out a way to save us from disaster , may have developed the solution. Licht is the mind behind STEP, a process where atmospheric carbon dioxide is sucked out of the sky and turned into carbon fibers.
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Concrete producers are increasingly being asked to provide mixes with a low-carbon footprint, especially for LEED-certified projects. Using fly ash as a substitute for portland cement is one approach, but with the current shortages of fly ash that has become increasingly difficult. This process uses controlled doses of carbon dioxide injected directly into the ready-mixed concrete truck during the initial batching and mixing.
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