By R. N. Swamy
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Extra info for The Alkali-silica reaction in concrete
The cracks will first form as a three- or four-pronged star pattern resulting from the expansion of gel around a reacting aggregate particle beneath the surface of the concrete, the cracks relieving the stress because of the local expansion. 11. The bleaching or discoloration often associated with these cracks is probably due to the strong alkali solutions which permeate along them, killing and bleaching lichen and fungus growths which occur in the vicinity of the crack on the surface of the concrete.
Guidance notes and model specification clauses. Technical Report No. 30. 29. J. K. with reference to the mechanism of reaction and deterioration. Proceedings of the Seventh International Conference on Concrete Alkali-Aggregate Reactions, pp. 226–230. 30. E. (1978) Effect of electric current on alkali-silica reaction. Proceedings of the Fourth International Conference on the Effects of Alkalis in Cement and Concrete, pp. 69—72. 31. Diamond, S. (1983) Alkali-reactions in concrete-pore solution effects.
In this test aggregate samples are stored at 80°C for 24 hours in 1 N sodium hydroxide. After this treatment the dissolved silica from the aggregate and the reduction in alkalinity of the solution are determined. These two results are then plotted against each other on a graph. This graph is divided into three fields: ‘innocuous’, ‘potentially deleterious’ and ‘deleterious’. Thus a particular aggregate can be classified according to its plotted position. Although the test is rapid and reasonably simple to use, many results fall in the potentially deleterious field, leaving room for uncertainty concerning their use.