Adding coffee grounds to concrete makes it 30% stronger

It not only reduces the sand that’s required, but finds a new use for the 60 million tons of coffee grounds that are dumped every year.

Every year, the world’s coffee drinkers throw out as much as 60 million tons of coffee grounds—and when they end up in landfills, coffee grounds release methane, a potent greenhouse gas. But researchers at Australia’s RMIT University have discovered a new use for the waste: adding it to concrete to make the final product stronger.

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