Affiliation:
1. Department of Construction Materials and Engineering Geology, Budapest University of Technology and Economics
H-1111 Budapest, Sztoczek u. 2, Hungary
Abstract
AbstractIn Budapest damage due to atmospheric pollution on many public buildings is severe. Black encrustations, white crusts and other decay features of a soft oolitic limestone have been studied in detail by using field measurements and laboratory analyses. Limestone weathering was assessed by description of weathering forms, by on-site petrophysical tests (Duroscope, Schmidt hammer, water absorption) and by laboratory mineralogical assessment and thermoanalysis (X-ray diffraction, Derivatograph). There is a clear correlation between the organic carbon content in stone and location of the site, particularly in the polluted city centre. Gypsum, which is not an indigenous mineral in the limestone, can contribute up to 70% of the crust composition and indicates the importance of air-derived SO2. This mineralogical change in stone composition leads to changes in physical properties, by strengthening laminar black crusts and white case hardened crusts and weakening the host rock.
Publisher
Geological Society of London
Subject
Geology,Ocean Engineering,Water Science and Technology
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