Abstract
Examination of drilled cores taken from a 60-year-old dam in Australia has shown that the dam has suffered from alkali aggregate reaction. Cracking has been observed on the crest of the dam and its concrete railing. The aggregate used in the concrete is a local dacite excavated from the dam site, and shows strong reaction rims particularly in the upper 10–12 m of the dam wall. Deeper portions of the dam wall appear to be free from reaction rims but the reasons for this have not been investigated. The reaction product was characterised by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and electron micro-probe analysis and was shown to be similar to previously reported alkali aggregate reaction products. New aggregate from the same locality as that used in the dam was tested for alkali reactivity and was found to be reactive with alkali in concrete.
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