Autogenous shrinkage normally takes location as the portland cement hydrates and without lack of drinking water through the blend versus the drying shrinkage process. Admixtures might cut down this type of shrinkage but usually are not exclusively meant to achieve this. They can be both anodic, cathodic, or a mix. https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html