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Discussion of the paper “quantitative microanalysis of alkali-silica gels in concrete”: By T. Knudsen and N. Thaulow

✍ Scribed by W.C. Hansen

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
127 KB
Volume
6
Category
Article
ISSN
0008-8846

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✦ Synopsis

This paper is an important contribution to our knowledge of the composition of the product that the authors call alkali-silica gel and others have called alkali-silica complex (1). This discussion is an effort to focus the attention on the chemistry involved in the alkali-silica reaction process that produces this alkali-silica gel from siliceous aggregates. It seems established (2,3,4) that the initial reaction in this process is the reaction of solid units of SiO 2 with ions from the pore fluid to produce solid alkali silicates, such as Na2SiO3.9H20. This enlarges the aggregate particle and this enlargement may cause cracks to form in the hardened cement paste.

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