The team from the University of Colorado Boulder is saying that they are working on the self healing concrete which can heal itself of the cracks and damages. This concrete is made up of sand, gel and bacteria, which is also named Living Concrete as it is capable of self-healing and is more environmentally friendly than concrete – which is the second most-consumed material on Earth after water.
It “heal their own cracks, suck up dangerous toxins from the air or even glow on command”.
source: https://www.sciencefocus.com/future-technology/future-technology-22-ideas-about-to-change-our-world/