The properties of a hydrated high-performance calcium sulfoaluminate (CSA) cement were investigated by means of XRD, DTA-TGA, SEM analyses and mercury porosimetry. The early hydration behaviour was strongly influenced by the high (0.78) stoichiometric water-solid mass ratio required by the reaction of with calcium sulfate and water towards ettringite and aluminium hydroxide. The high rate of this reaction resulted into a rapid depletion of water within a relatively short curing period and both full consumption of reactants and hydration of other CSA cement components were hindered. However, conversion degrees of 0.60 and 0.87 were obtained at 3 hours and 28 days respectively, for CSA cement pastes cured with a water-cement ratio equal to 0.45. Both the fast formation of ettringite and the rapid establishment of prevailing low-porosity regions can play a very important role in regulating the technical behaviour of high-performance CSA cements

Early hydration of calcium sulfoaluminate-based cements for structural applications

MARROCCOLI, Milena
Writing – Review & Editing
;
TELESCA, ANTONIO
Writing – Original Draft Preparation
;
VALENTI, Gian Lorenzo
Writing – Review & Editing
2007

Abstract

The properties of a hydrated high-performance calcium sulfoaluminate (CSA) cement were investigated by means of XRD, DTA-TGA, SEM analyses and mercury porosimetry. The early hydration behaviour was strongly influenced by the high (0.78) stoichiometric water-solid mass ratio required by the reaction of with calcium sulfate and water towards ettringite and aluminium hydroxide. The high rate of this reaction resulted into a rapid depletion of water within a relatively short curing period and both full consumption of reactants and hydration of other CSA cement components were hindered. However, conversion degrees of 0.60 and 0.87 were obtained at 3 hours and 28 days respectively, for CSA cement pastes cured with a water-cement ratio equal to 0.45. Both the fast formation of ettringite and the rapid establishment of prevailing low-porosity regions can play a very important role in regulating the technical behaviour of high-performance CSA cements
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/16462
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