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Extra resources for Alkali-Silica Reaction in Concrete
Crushed glass, geometric and true surface areas may be equivalent, whereas in others, such as cherts, the true surface exposed to attack is much greater than the apparent geometric surface area, owing to their porous nature. Moreover, the harmful effects of a particular aggregate may be variable, depending upon its content: this is the well-known pessimum effect which has been described by Hobbs6. 1 Origin and significance of pore fluid Since the alkali-aggregate reaction occurs in wet environments, it is not necessary to consider reactions in dry cement concretes, although the effects of periodic wetting and drying may require to be assessed.
E. (1951) Studies in cement aggregate reaction. XVI. The effect of hydroxyl ions on the reaction of opal. Aust. J. Appl. Sci. 2, 108–113. 26. S. and Kataoka, N. (1981) The chemistry of alkali-aggregate reactions. Proceedings of the Fifth International Conference on Alkali-Aggregate Reaction in Concrete, S252/23, pp. 1–7. 27. Skalny, J. and Klemm. A. (1981) Alkalis in clinker: origin, chemistry, effects. Proceedings of the Fifth International Conference on Alkali-Aggregate Reaction in Concrete, S252/1, pp.
The balance of the alkali remaining in the cement paste after a given time will be different for each prism, with highest concentrations in the prisms containing least reactive aggregate and decreasing as the percentage of reactive aggregate increases. As time proceeds reaction and expansion continue, so that for prisms with small percentages of reactive material the aggregate becomes used up with consequent changes in the ratio of alkali to reactive constituent. Similarly, with high concentrations of reactive aggregate, it is the alkalis that become used up, with the ratio changing in the opposite direction to the first case.