Cracking of concrete at Owen Falls power station, Uganda, wasdiagnosed as being due to concrete expansion caused byalkali-aggregate reaction. Resulting struc- tural movements hadcaused local over- stressing and also deflections of installed plantand equipment. The degree of expansion varied according to thedifferent cements used during construction. The processes ofdetecting and clarifying the implications of the various movementsare explained, together with measures taken to mitigate immediateproblems and provide adequate monitoring to areas of longer-termconcern. Lessons are drawn for the guidance of others investigationsimilar phenomena.
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