TITLE:
Influence of Benzenediols—Pyrocatechol and Resorcinol—On the Resistance of Portland Cement Mortars with Aluminum Sulfate to Sulfate Attack
AUTHORS:
Alexey Brykov, Natalia Paritskaya, Alexander Velichko, Maxim Mokeev
KEYWORDS:
Pyrocatechol, Benzenediols, Aluminum Sulfate, Portland Cement, Sulfate Attack, Ettringite, NMR Spectroscopy
JOURNAL NAME:
Materials Sciences and Applications,
Vol.9 No.2,
February
14,
2018
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 27Al-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.