Title:
Alkali-Silica Gel Formation at an Early Age Through Solution
Author(s):
A. M. Harrisson, S. P. Varma, N. B. Winter
Publication:
Symposium Paper
Volume:
100
Issue:
Appears on pages(s):
1743-1758
Keywords:
age; alkali-aggregate reactions; concrete durability; opal; potassium hydroxides; silica gel; sodium soundness; General
DOI:
10.14359/3822
Date:
4/1/1987
Abstract:
A mode of occurrence of alkali-silica gel in a 22-year-old concrete has been interpreted in the light of experiments using Beltane opal as a reactive aggregate in a solution of sodium and potassium hydroxide. These experiments indicate that alkali-silica gel forms from solution as a result of the dissolution of reactive silica. The distribution of alkali-silica gel in the sample of field concrete examined suggests that alkali-silica reaction may occur at an early age in the life of the concrete although the concrete may remain apparently sound for many years.