Coffee grounds for road construction. Free Technical Library News

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Coffee grounds for road construction

21.05.2016

Every year, millions of coffee houses throw millions of tons of dormant coffee into the trash, which is an insoluble material rich in organic compounds. In this regard, the efforts of scientists are aimed at finding a use for this waste. Projects already underway include the use of coffee as a fuel through the gasification of biomass or the extraction of oils from coffee, which make up up to 20% of the solid mass of waste, as well as for filters that capture carbon released into the atmosphere.

A new approach to the use of used coffee was recently proposed by scientists from the Swinburne University of Technology in Melbourne (Australia), who turned waste into a geopolymer - a monolithic building material formed as a result of interaction in an alkaline environment of components (including those) of geological origin. To do this, the researchers added slag in a ratio of 7:3 and solutions of sodium metasilicate and sodium hydroxide to the used coffee, and then pressed the mass into cylindrical blocks. The tests carried out showed that the resulting material has sufficient strength to be used as a soil base in the construction of roads.

According to researchers, coffee waste produced in restaurants and cafes in Melbourne (population 5 million) is enough to build 5 km of roads annually. Scientists see a double benefit in this use of coffee. Firstly, public catering enterprises will not have to pay for the disposal of waste, which is now taken to a landfill; secondly, environmental damage will be reduced by reducing the need to develop new quarries for building materials.

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