Hydrated cement paste shrinks since it loses humidity from its extremely smaller pores. As the moisture is dropped in these smaller pores, the surface stress on the remaining h2o has a tendency to pull the pores together which results in a loss of quantity after a while. Retarders slow the https://www.tjcyindustrialchem.com/news/cement-additives-and-concrete-admixtures-key-differences.html