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Effect of BaCO3 on C3A hydration
Abstract Ba ions are known to immobilise sulfates by forming BaSO4. The use of BaCO3 as a full or partial substitute for gypsum to regulate C3A (3CaO·Al2O3) hydration was consequently studied with a view to establishing its correct dosage in sulfate-resistant cements presently under development. The hydration rate of synthetic C3A was determined in the presence of varying percentages of gypsum, BaCO3, and gypsum+BaCO3 by running conduction calorimetry analyses on early age (up to 20h) samples. The hydration products were subsequently identified with XRD, FTIR and DTA/TG. The addition of (20–42wt.%) BaCO3 to C3A neither regulated the speedy reaction of the latter with water nor reacted with the aluminate. Gypsum+BaCO3 blends proved able to regulate C3A hydration; the heat flow curves for the mixes studied exhibited an induction period, an indication that gypsum acted as a C3A hydration regulator whilst at the same time reacting with BaCO3 to form barite.
Effect of BaCO3 on C3A hydration
Abstract Ba ions are known to immobilise sulfates by forming BaSO4. The use of BaCO3 as a full or partial substitute for gypsum to regulate C3A (3CaO·Al2O3) hydration was consequently studied with a view to establishing its correct dosage in sulfate-resistant cements presently under development. The hydration rate of synthetic C3A was determined in the presence of varying percentages of gypsum, BaCO3, and gypsum+BaCO3 by running conduction calorimetry analyses on early age (up to 20h) samples. The hydration products were subsequently identified with XRD, FTIR and DTA/TG. The addition of (20–42wt.%) BaCO3 to C3A neither regulated the speedy reaction of the latter with water nor reacted with the aluminate. Gypsum+BaCO3 blends proved able to regulate C3A hydration; the heat flow curves for the mixes studied exhibited an induction period, an indication that gypsum acted as a C3A hydration regulator whilst at the same time reacting with BaCO3 to form barite.
Effect of BaCO3 on C3A hydration
Gismera-Diez, S. (author) / Manchobas-Pantoja, B. (author) / Carmona-Quiroga, P.M. (author) / Blanco-Varela, M.T. (author)
Cement and Concrete Research ; 73 ; 70-78
2015-03-06
9 pages
Article (Journal)
Electronic Resource
English
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