carbonated cement
If widely adopted, a new approach to the manufacture of cement can significantly reduce emissions of greenhouse gases, reduce water consumption and help deal with global warming - as well as producing a more durable concrete and lower cost .
The masons will quite surprising, because the new type of cement gains strength through carbonation, and not mixing it with water.
"Instead of cement that reacts with water, the carbonated cement reacts with carbon dioxide and calcium silicate," explains Professor Jason Weiss, the State University of Oregon, USA.
"At first glance this new product looks like conventional concrete, but it has properties that should make it last longer in some applications. In addition, its use could reduce carbon dioxide emissions, which is an important objective of the cement industry, "he added.
calcium silicate cement Carbonated
The new material was called "calcium silicate cement carbonated" or SCCS (Carbonated Calcium Silicate-based Cement).
According to Weiss, the new cement is ready to be used in pre-cast concrete products which can be built in a factory and transported to where it will be used. A more widespread use may take longer, since the carbonation requires a more complicated apparatus than a hose spouting water over the dough - like cylinders with CO2 under pressure.
The team demonstrated that the material is more resistant to degradation than ordinary concrete, even in direct contact with salt used for deicing roads in cold climates, such as sodium chloride and magnesium chloride.
The concrete - a combination of cement, sand and gravel - is one of the most effective materials of construction of human history. This is actually part of the problem - the concrete works so well and has so many uses that are produced annually from 2 to 4 tons of concrete for every person on Earth, which is believed to be responsible for something between 5 and 8% of all global emissions of carbon dioxide.
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