Journal
BUILDING AND ENVIRONMENT
Volume 35, Issue 8, Pages 737-749Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0360-1323(00)00015-9
Keywords
environmental monitoring; equilibrium relative humidity; hygroscopicity; salt analysis; stone decay
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An investigation of the effects of humidity and salt crystallisation on medieval masonry has been undertaken at the parish church of Walpole St Andrew, Norfolk? with the intention of establishing a relationship between changes in environmental conditions and levels of stone decay. Masonry within the church has been contaminated with sodium chloride salts, which are undergoing cycles of crystallisation/dissolution in response to fluctuations in relative humidity corresponding to the equilibrium relative humidity of the salt. The effects of these cycles have been determined by a combination of gravimetric analysis, ion chromatography, and qualitative assessment of deposited material. Appropriate remedial action, based on a combination of desalination techniques and environmental control, is put forward for discussion. (C) 2000 Elsevier Science Ltd. All rights reserved.
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