Case 1
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Introduction
Type of Building: Public residential flat
Dirty and wet surfaces react with atmospheric gases such as carbon dioxide, sulphur dioxide and nitrogen, to form corrosive liquids of carbonic acids, nitric acids, sulphuric acids. The sulphate content of the brick becomes important in relation to sulphate attack on the mortar. See also Acid Rain.
Chemical attack results in a spalled brick surface, damage to the appearance of the building in the form of stains and white deposits of efflorescence.
