Professor of the local Swinburn University – Arul Arulrai once asked himself: why not use coffee wastes as a component of the road surface? The team under his leadership gathered coffee grounds from all the surrounding institutions. After a careful five-day drying in a special oven at a temperature of 50 ° C, coffee wastes were filtered off, the lumps were removed, and then mixed with the waste of steel production – slag at a ratio of 7: 3.
Further, a liquid alkaline solution was added to the mixture, which bound its components. As a result, strong cylindrical blocks have been made that can be used as a ground material under the road surface .
According to scientists, the available coffee waste Melbourne would more than enough to build 5 km of roads per year.