Early hydration behaviour of portland cement containing boro-, citro- and desulphogypsum

摘要: Abstract Portland cements containing boro-, citro- and desulphogypsum, respectively, were hydrated at water:cement ratio 0.5 for up to two hours compared with a cement high grade natural gypsum similarly. It was found that the boro- citrogypsum produced considerably more ettringite than those desulpho- gypsum. Comparisons made previous investigations of fluoro-, formo- phosphogypsum, under analogous conditions. Reasons observed hydration behaviour aforementioned chemical gypsums are discussed.