Capitals - Saba:
Scientists at the Don University of Technical Sciences, with the participation of scientists from Turkey, Azerbaijan and Lebanon, have created a concrete made from biochar produced from coffee residues after processing.
According to the researchers, whose results were recently published, the addition of coffee residues to concrete allows for a reduction in the proportion of cement and improves its quality.
Coffee is one of the world's most widely consumed beverages, with one kilogram of instant coffee yielding about two kilograms of waste. From the seven million tonnes of coffee produced in the world every year, about 14 million tonnes of wet waste can be generated.
The scientists pointed out that organic materials, such as coffee grounds, should not be added directly to concrete because they release substances that weaken its durability. Instead, it must be heated to 400 degrees centigrade to remove oxygen and then grinded to create a porous, carbon-rich charcoal called biochar.
Scientists studying the properties of biochar found that adding it to concrete not only saves cement, but also improves the properties of the concrete. The best percentage of biochar in the composition of concrete is four per cent.
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