Hi folks,
My research group has published on this as well. We derived a more generalized model that will help folks plug in the amount of fly ash, slag, etc. and type of cement.
Please see the following:
We showed implementation of the model in LCA in regular concrete and pervious concrete (and recently extended it to hempcrete – that paper is in review):
The moral of the story – we can only get back <20% (oftentimes way less if using SCMs) of the initial carbon through carbonation. In addition, it is still very much worth using high-volume SCMs and lower compressive strength concretes where possible to minimize total life cycle carbon.