 Upon hydration, the main reaction products are a calcium silicate gels (C-S-H) and calcium hydroxide Ca(OH)2 or CH in cement chemistry.Moisture makes this reaction happen and can cause serious structural damage to both wall slabs and walls in buildings.Sulfate attacks happen to ground floor slabs, this issue generally affects properties from the 1950s and 1960s but can affect earlier structures where a concrete floor slab has been installed.