By R. N. Swamy
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Additional info for Alkali-Silica Reaction in Concrete
A further point to note is that many modern computer-corrected microanalyses are also normalised to 100% for the elements determined, with those elements below atomic number 11 such as carbon not being detected. 2 has been compiled from a number of sources and gives an idea of the range of gel compositions reported. Gel viscosities also exhibit a wide range of values, and can produce pressures extending up to 11 MPa. It is clear that as an alkali-silica gel first develops at a reaction site within a concrete it will at first be very viscous, but as it absorbs moisture from the pore fluids and swells it will gradually become less viscous until eventually it will become fluid enough to flow along cracks, fill voids and permeate the micropores in the cement paste.
11. 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.
1981) Alkalis in clinker: origin, chemistry, effects. Proceedings of the Fifth International Conference on Alkali-Aggregate Reaction in Concrete, S252/1, pp. 1–7. 28. Concrete Society (1987) Alkali-Silica Reaction, Minimising the Risk of Damage to 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.
Alkali-Silica Reaction in Concrete by R. N. Swamy