The Mitigation of Alkali-Silica Reactions by Aluminum-Bearing Substances

Alexey Brykov; Anna Anisimova; Natalia Rozenkova

doi:10.4236/msa.2014.56041

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Materials Sciences and Applications > Vol.5 No.6, May 2014

The Mitigation of Alkali-Silica Reactions by Aluminum-Bearing Substances ()

Alexey Brykov, Anna Anisimova, Natalia Rozenkova

Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia.

DOI: 10.4236/msa.2014.56041 PDF HTML 3,967 Downloads 4,907 Views Citations

Abstract

An ability of aluminum-bearing substances-amorphous aluminum hydroxide, aluminum sulphate and basic aluminum sulphate to mitigate alkali-silica reactions in Portland cement mortars has been studied. At equivalent dosages in terms of Al₂O₃, these substances are ranged in the following order in respect of inhibiting effect: Al(OH)_1.78(SO₄)_0.61≥ Al₂(SO₄)₃ > Al(OH)₃. It is found that the plasticizing agents of the main types used in cement compositions have no influence on the inhibiting effect of aluminum-bearing admixtures. To control the setting time of cement paste, iron(II) sulphate may be used for partial substitution of Al₂SO₄·18H₂O, and this operation is not influence on the results of ASR expansion test.

Keywords

Alkali-Silica Reaction Mitigation, Aluminum Hydroxide, Aluminum Sulphate, Basic Aluminum Sulphate, Concrete, Iron(II) Sulphate, Portland Cement, Superplasticizers, Water-Reducing Admixtures

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Brykov, A. , Anisimova, A. and Rozenkova, N. (2014) The Mitigation of Alkali-Silica Reactions by Aluminum-Bearing Substances. Materials Sciences and Applications, 5, 363-367. doi: 10.4236/msa.2014.56041.

Conflicts of Interest

The authors declare no conflicts of interest.

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