Researchers at the Royal Melbourne Institute of Technology (RMIT) have found an unusual use for used kitchen grounds as an additive in concrete, making it nearly a third strong.

Every year, coffee drinkers drink after themselves up to 60 million. tons of waste in the form of grounds (SCG). The vast majority of them end up in landfills. Studies have shown that fine SCG particles can become a reinforcing component of concrete. For this reason, it is heat-resistant, and it is heated by pyrolysis (without oxygen) at a temperature of 350-500 ° C, after which the coffee grounds turn into biochar.

A total of 12 mixtures were developed, which were added to Portland cement at a depth of 5, 10, 15 and 20% as a filler instead of sand. In the process of testing, “coffee” concrete was filled into molds, removed from it with an air vibrator and tried. It was then left for a day at a low temperature, ground in a tank of water, and thoroughly tested by the compression method. As a result of creating concrete, where 15% of the sand was replaced by the SCG mixture, the increase in compressive strength by almost thirty%.

Source: Tech Cult

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