A new paper has been published in the Journal of Advanced Concrete Technology.
This study investigates the evolution of pore structures during the carbonation process using ¹H NMR relaxometry and discusses how these microstructural changes influence macroscopic carbonation shrinkage.

Our results indicate that shrinkage may continue even in the later stages of carbonation, during which dissolution and reprecipitation appear to stabilize the system. This suggests that theoretical prediction of carbonation shrinkage can be highly challenging. While the present conclusions are temporal due to the limited availability of supporting data from other perspectives, the findings provide essential baseline information for future discussions on carbonation-induced deformation.

The paper is open access; please take a look.