The early stages of building stone decay in an urban environment |
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| Institution: | 1. Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave, 308 Mellon Hall, Pittsburgh, PA 15282, United States;2. Agilent Technologies, 2850 Centerville Rd, Wilmington, DE 19808, United States;3. Department of Biological Chemistry, Johns Hopkins University School of Medicine, 725 N. Wolfe St, Baltimore, MD 21205, United States;4. Gerstel, Inc., 701 Digital Drive, Suite J, Linthicum, MD 21090, United States;5. Applied Isotope Technologies, 2403 Sidney St, Pittsburgh, PA 15203, United States |
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| Abstract: | Short term exposure (2 months) of small limestone samples in an urban environment coupled with subsequent SEM observations provides detailed evidence of the initial stages of decay. After 2 months, significant amounts of gypsum were found on stone samples which had been sheltered from rainfall. Samples which had been exposed to rainfall had negligible gypsum development, but showed considerable microscale evidence of dissolution. Clear differences emerged between the responses of the two different building stones used in the experiment, with Portland Stone having much greater amounts of gypsum after exposure than Monk's Park Stone. |
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