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Coffee can help the planet. The use of waste in the construction sector reduces the amount of cement!

2024-05-23 11:04:56Lifestyle SHKRUAR NGA REDAKSIA VOX

Coffee can help the planet. The use of waste in the construction sector reduces

That's the promise of an Australian university to turn used coffee grounds into a material that can be added to concrete to make it stronger and more durable. Concrete, made by mixing sand and gravel with cement and water, is a major producer of greenhouse gases, responsible for about 8% of the world's emissions.

Researchers at the Royal Melbourne Institute of Technology (RMIT) heated coffee grounds to 350 degrees Celsius in an oxygen-free chamber to create a substance called biochar. This biochar can replace up to 15% of the sand used in concrete and make it 30% stronger, and this extra strength means up to 10% less cement is needed, according to the researchers.

About 50 billion tons of sand and gravel are excavated each year, mostly for use in concrete. Its extraction is often devastating to the environment, and the United Nations says it is increasingly insufficient. Cement, which is made by heating a mixture of limestone and clay to about 1,500 degrees Celsius, is responsible for most of concrete's emissions.

RMIT, which is working with several construction and concrete companies, including Australian firm BildGroup, is forming a company to produce biochar and is in talks with Starbucks to take its coffee grounds. Our billions of coffee grounds are produced globally, and most are sent to landfills, where they release methane as they decompose.

Australia produces about 75,000 tonnes of waste a year and the biochar made from it can replace up to 675,000 tonnes of sand in concrete because it is a denser material. Food waste makes up about 3% of Australia's emissions, according to the government, and most can eventually be converted to biochar.

"We anticipate that we can divert about 60-70% (of organic waste) from landfill to concrete applications," the researchers said. Different organic materials produce different qualities of biochar and RMIT was the first to use coffee in this way.


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