Autogenous shrinkage normally takes put as the portland cement hydrates and with no lack of water in the combine versus the drying shrinkage process. Admixtures may well lower this type of shrinkage but usually are not specially created to achieve this. Superplasticizer effect lasts only 30 Dao 60 minutes, and https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html