Abstract
This paper describes the scientific research and investigations undertaken to establish the causes of deterioration of a Stanton air raid shelter at a World War II airfield in East Lothian, Scotland. The concrete is fairly strong and has low sorptivity, but the main concern is the concrete delamination caused by the corrosion of the steel reinforcements. It is shown that the corrosion is due to chloride ions present in the concrete rather than carbonation of the concrete. The materials used in the concrete mix appear to be the source of the chlorides, possibly because calcium chloride was used as a set accelerator. It is argued that the conservation of the shelter is crucial to preserve the completeness of the airfield and potential treatment options are considered.
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