Can calcium aluminates activate ternesite hydration?

Aluminum hydroxide (AH3) has recently been shown to be able to activate hydration in ternesite, a phase found in some calcium sulfoaluminate (CSA) cements. This study explored the capacity of a number of calcium aluminates (C3A, C12A7, CA and C4A3S¯) to activate ternesite hydraulic reactivity. After...

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Bibliographic Details
Published in:Cement and concrete research 2018-01, Vol.103, p.204-215
Main Authors: Montes, M., Pato, E., Carmona-Quiroga, P.M., Blanco-Varela, M.T.
Format: Article
Language:English
Subjects:
ALUMINATES
ALUMINIUM HYDROXIDES
Aluminum hydroxide
CALCIUM
Calcium aluminate
Calcium aluminates
CEMENTS
DIFFERENTIAL THERMAL ANALYSIS
FOURIER TRANSFORMATION
Heat transmission
Hydration
Hydration heat
Hydration products
Hydraulics
INFRARED SPECTRA
MATERIALS SCIENCE
Minerals
Pastes
Reaction products
Ternesite
Thermal analysis
Tricalcium aluminum ferrite
X-RAY DIFFRACTION
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Summary:Aluminum hydroxide (AH3) has recently been shown to be able to activate hydration in ternesite, a phase found in some calcium sulfoaluminate (CSA) cements. This study explored the capacity of a number of calcium aluminates (C3A, C12A7, CA and C4A3S¯) to activate ternesite hydraulic reactivity. After laboratory synthesis, the aluminates were blended with ternesite at a ratio of 1:2 and their hydration was monitored with isothermal conduction calorimetry for 7days at 25°C. The resulting pastes were analysed with XRD, FTIR and DTA. The presence of ternesite in the pastes altered the aluminate heat flow curves, shortening the induction period and bringing the reaction peak forward, an indication of hastened hydration. Ternesite also altered the reaction products, which included calcium monosulfoaluminate hydrate and strätlingite.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2017.10.017