Effect of Alkaline Salts on Calcium Sulfoaluminate Cement Hydration

This work analyzes the effect of the presence of 5 wt.% of solid sodium salts (Na SO , Na CO , and Na SiO ) on calcium sulfoaluminate cement (CSA) hydration, addresses hydration kinetics; 2-, 28-, and 90-d mechanical strength, and reaction product microstructure (with X-ray diffraction (XRD), and Fo...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2021-03, Vol.26 (7), p.1938
Main Authors: Tambara Júnior, Luís Urbano D, Rocha, Janaíde C, Cheriaf, Malik, Padilla-Encinas, Pilar, Fernández-Jiménez, Ana, Palomo, Angel
Format: Article
Language:English
Subjects:
alkaline salts
Anions
Calcium
calcium sulfoaluminate cement
Carbonation
Cement
Cement hydration
Compressive strength
Ettringite
Fourier transforms
Gypsum
Hydration
Infrared spectroscopy
Mechanical properties
microstructure
Pastes
Reaction products
Salts
Sodium
Sodium salts
Sodium silicates
Sodium sulfate
Sulfoaluminate cement
X-ray diffraction
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Summary:This work analyzes the effect of the presence of 5 wt.% of solid sodium salts (Na SO , Na CO , and Na SiO ) on calcium sulfoaluminate cement (CSA) hydration, addresses hydration kinetics; 2-, 28-, and 90-d mechanical strength, and reaction product microstructure (with X-ray diffraction (XRD), and Fourier transform infrared spectroscopy, (FTIR). The findings show that the anions affect primarily the reactions involved. Ettringite and AH , are the majority hydration products, while monosulfates are absent in all of the samples. All three salts hasten CSA hydration and raise the amount of ettringite formed. Na SO induces cracking in the ≥28-d pastes due to post-hardening gypsum and ettringite formation from the excess SO present. Anhydrite dissolves more rapidly in the presence of Na CO , prompting carbonation. Na SiO raises compressive strength and exhibits strätlingite as one of its reaction products.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26071938