An Interpretation of Some Published Researches on the Alkali-Aggregate Reaction Part 2 - A Hypothesis Concerning Safe and Unsafe Reactions with Reactive Silica in Concrete

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Title: An Interpretation of Some Published Researches on the Alkali-Aggregate Reaction Part 2 - A Hypothesis Concerning Safe and Unsafe Reactions with Reactive Silica in Concrete

Author(s): T. C. Powers and H. H. Steinour

Publication: Journal Proceedings

Volume: 51

Issue: 4

Appears on pages(s): 785-812

Keywords: no keywords

Date: 4/1/1955

Abstract:
Enlarging on considerations set down in Part 1, the authors develop a hypothesis concerning reactions between reactive silica, calcium hydroxide, and alkali in concrete. The hypothesis is that the reaction proceeds safely or unsafely according to the relative amounts of calcium hydroxide and alkali absorbed in the outer part of the reacted layer of the opal particle. Published experimental data are analyzed according to the hypothesis with the aid of Kalousek's data on the lime-alkali-silica-water system. Several conclusions are drawn, bearing on safe limits of alkali content and safe silica-alkali ratios.