Biomason uses biotechnology to offer a planet-friendly alternative to traditional cement.
For more than 200 years, traditional cement production has released carbon dioxide as a byproduct of burning limestone but discarding the carbon. Instead, Biomason has tamed and is now breeding bacteria that combine common, natural materials into a binder that produces high quality concrete, replaces Portland cement, and cuts carbon emissions. Biocement is a more planet-friendly reinvention of traditional cement.
Taking inspiration from marine ecosystems, the company builds calcium carbonate crystals to bind together aggregate and form natural, sustainable concrete products with high compressive and flexural strength.
Biocement grows in ambient temperatures, building with carbon to create concrete products. 
Reference https://biomason.com/