28/10/2026
Bacteria that grow limestone crystals between grains of sand, binding them solid without any heat. ETH Zurich has already printed a facade panel this way.
Making cement means firing limestone in a kiln, which is where a big chunk of its carbon comes from. This process needs no heat at all. Biocementation has been used to stabilise soils and in self-healing concrete before, but printing it into finished building parts is a big step on.
It’s early days. Nothing it makes can carry load yet, and a printed piece needs two to five days of daily mineral baths to harden.
What it needs next is consistent, tested performance that designers can specify and insurers will cover.
đź”—https://www.globalconstructionreview.com/swiss-researcher-develops-printable-concrete-held-together-with-bacteria/