Decalcification shrinkage of cement paste

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Quality Improvement Techniques for Recycled Concrete Aggregate: A review (2019, background): “Decalcification can cause formation of Si-OH groups and consequently the formed silica gel improves the bond between the cement paste and the RCA (Chen et al. 2006).”
Impact of carbonation on unsaturated water transport properties of cement-based materials (2015, background): “The C-S-H decalcification 467 induced by carbonation and the subsequent polymerisation (increase of the main silica chain length) 468 generated shrinkage [80].”
Carbonation of cement paste : Understanding, challenges, and opportunities (2016, background): “Cracking is suggested to be caused by differential decalcification shrinkage due to a gradient of Ca/Si ratios across the specimen [83].”
Natural carbonation of aged alkali-activated slag concretes (2014, background): “However, it is also possible that this is a consequence of the decalcification of the binding gel, which induces internal mechanical stresses and promotes the formation of microcracks during carbonation [36].”
Internal Curing of High-Performance Blended Cement Mortars (2007, background): “As previously suggested by Jensen and Hansen,(18) in systems containing such pozzolans, a portion of the autogenous shrinkage could be due to decalcification shrinkage, either due to dissolution of calcium hydroxide crystals or reduction in the calcium/silicon ratio of the primary hydration product,”