Crystal chemistry of lamellar calcium aluminate sulfonate hydrates: Fixation of aromatic sulfonic acid anions

Abstract

In ordinary portland cements the calcium aluminate and calcium aluminate ferrate phase react with the sulphate phase (gypsum or different calcium sulphate hydrates) to ettringite (Aft-phases) and are transferred with additional C3A, to lamellar calcium aluminate ferrate hydrates (Afm-phases). The interaction of admixtures with cement pastes does not only manipulate the properties of the cement paste, the crystal chemistry of the hydrated phases were influenced, too (Pöllmann 1989a; Kuzel 1969).