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The Mitigation of Alkali-Silica Reactions by Aluminum-Bearing Substances
Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
- 1 Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
- 2 Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
- 3 Department of Chemistry of Substances and Materials, St. Petersburg State Institute of Technology, St. Petersburg, Russia
Materials Sciences and Applications·Volume 05 (2014)·Pages 363–367·Published 13 May 2014·DOI10.4236/msa.2014.56041
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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 Al 2 O 3 , these substances are ranged in the following order in respect of inhibiting effect: Al(OH) 1.78 (SO 4 ) 0.61 ≥ Al 2 (SO 4 ) 3 > Al(OH) 3 . It is found that the plasticizing agents of the main types used in cement compos itions 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 Al 2 SO 4 ·18H 2 O, and this operation is not influence on the results of ASR expansion test.
KeywordsAlkali-Silica Reaction MitigationAluminum HydroxideAluminum SulphateBasic Aluminum SulphateConcreteIron(II) SulphatePortland CementSuperplasticizersWater-Reducing Admixtures
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