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The Impact of Aluminum-Containing Set Accelerators on Sulfate Resistance of Portland Cement Compositions
Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, Saint Petersburg State Institute of Technology, Saint Petersburg, Russia
Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, Saint Petersburg State Institute of Technology, Saint Petersburg, Russia
Institute of Macromolecular Compounds, Russian Academy of Sciences, Saint Petersburg, Russia
- 1 Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, Saint Petersburg State Institute of Technology, Saint Petersburg, Russia
- 2 Department of Technology of Constructional and Special Binders, Faculty of Chemistry of Substances and Materials, Saint Petersburg State Institute of Technology, Saint Petersburg, Russia
- 3 Institute of Macromolecular Compounds, Russian Academy of Sciences, Saint Petersburg, Russia
Materials Sciences and Applications·Volume 04 (2013)·Pages 29–34·Published 26 December 2013·DOI10.4236/msa.2013.412A005
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Abstract
This study contains comparative research of sulfate resistance of ordinary Portland cement pastes with addition of basic aluminum sulfate (hydroxosulfate, Al(OH) 1.78 (SO 4 ) 0.61 ) and amorphous Al(OH) 3 . Over 3 months of storing in sodium sulfate solution, the most significant expansion and deterioration occur in case of samples with aluminum hydroxide. During sulfate resistance test, the ratio between aluminum nuclei in AFt (ettringite) and AFm phases was studied by 27 Al-MAS NMR, and the impact of aluminum-containing admixtures on this ratio was specified. In accordance with NMR data, in samples with Al(OH) 3 , the rate of secondary ettringite formation becomes noticeable after one month of storing in sulfate solution. For samples with Al(OH) 1.78 (SO 4 ) 0.61 , the rate of elongation and temper of changes in molar ratio between sulfoaluminate phases were comparable with reference samples without admixtures.
KeywordsPortland Cement HydrationSet AcceleratorBasic Aluminum SulfateAluminum HydroxideSulfate ResistanceMAS NMR Spectroscopy
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