Materials Sciences and Applications

Volume 4, Issue 12 (December 2013)

ISSN Print: 2153-117X   ISSN Online: 2153-1188

Google-based Impact Factor: 0.97  Citations  

The Impact of Aluminum-Containing Set Accelerators on Sulfate Resistance of Portland Cement Compositions

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DOI: 10.4236/msa.2013.412A005    5,200 Downloads   7,633 Views  Citations

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(SO4)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 27Al-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(SO4)0.61, the rate of elongation and temper of changes in molar ratio between sulfoaluminate phases were comparable with reference samples without admixtures.

Share and Cite:

A. Brykov, A. Vasiliev and M. Mokeev, "The Impact of Aluminum-Containing Set Accelerators on Sulfate Resistance of Portland Cement Compositions," Materials Sciences and Applications, Vol. 4 No. 12A, 2013, pp. 29-34. doi: 10.4236/msa.2013.412A005.

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