Several types of super low carbon concrete that have been developed. One is C-Crete which was developed by a materials engineer in the SF Bay area. Here’s C-Crete’s LinkedIn page. There’s a lot of information about them on the internet. 

Don Davies, the project’s engineer & owner, says he thinks it’ll be another 5-10 years before super low carbon concrete will be available in local concrete suppliers in our area at a competitive prices to conventional concrete.

Seattle’s Living Laboratory Tests Novel Low-Carbon Building Materials

Prometheus Materials in Boulder, Colorado is another good company who has developed some super low carbon concrete products.

Here’s another company from Boston Home – Sublime Systems