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Influence of Benzenediols—Pyrocatechol and Resorcinol—On the Resistance of Portland Cement Mortars with Aluminum Sulfate to Sulfate Attack
Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
Institute of Macromolecular Compounds, St. Petersburg, Russia
- 1 Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
- 2 Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
- 3 Department of Chemistry of Substances and Materials, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia
- 4 Institute of Macromolecular Compounds, St. Petersburg, Russia
Materials Sciences and Applications·Volume 09 (2018)·Pages 305–313·Published 2 February 2018·DOI10.4236/msa.2018.92020
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Abstract
The effect of benzene-1,2-diol (pyrocatechol) and benzene-1,3-diol (resorcinol) on the development of sulfate attack in Portland cement mortars containing alkali-free setting accelerator (aluminum sulfate) was studied. It has been found that these compounds (especially pyrocatechol—due to its ability to form chelate complexes with aluminum ions) restrain destructive deformations of Portland cement mortars with aluminum sulfate admixture when under test conditions a constant supply of sulfate ions from external source is provided. According to 27 Al-MAS NMR data, pyrocatechol does not influence the amount of ettringite formed in Portland cement paste during its store in sodium sulfate solution. Presumably, in presence of benzenediols, in cement mortars with aluminum sulfate admixture the formation of ettringite crystals with a less pronounced destructive effect takes place.
KeywordsPyrocatecholBenzenediolsAluminum SulfatePortland CementSulfate AttackEttringiteNMR Spectroscopy
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