Organic waste can't be added directly to concrete because it would decompose over time and weaken the building material. To overcome this challenge, researchers developed a technique to make concrete 30% stronger using coffee biochar made with a low-energy process without oxygen.
![](https://www.rmit.edu.au/content/dam/rmit/rmit-images/news/2024/may/coffee-footpath-trial/news-coffee-footpath-team-1220px.jpg)
https://ift.tt/CPKQSuf via /r/tech https://ift.tt/jK6yt9I
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