The bacteria and self healing is separate from the strengthening process. You can actually make concrete objects with just sand, water and the bacteria. It is rather brilliant. There was an artist who was making chairs with that process. Who uses urine.
https://www.dezeen.com/2014/02/08/st...peter-trimble/
Now nano platelets most likely could be harvested from several food wastes, and there has been research into also using nano cellulose also: file:///C:/Users/jcoray/Downloads/A%20REVIEW%20ON%20EFFECT%20OF%20NANO%20CELLULOSE%2 0ON%20CONCRETE-1963.pdf
We were able to make some very high strength concrete using Grace Admixtures by radically reducing water, and 12,000psi concrete for table tops and counters is fairly easy to make. My father in law does it as a side job. So you could reduce the concrete if you used admixtures properly also, since most just need to nail 3000 psi in 28 days. We were hitting the machine testing limit of 26,000 psi in 28 days.