Investigation on the relationship between the environment and istria stone surfaces in Venice

摘要: Abstract Architectural limestone surfaces are particularly susceptible to decay from natural and anthropogenic acidifying gases particulates. This investigation evaluates environmental conditions, air quality, patters on Istria stone of four palaces in Venice (Italy): Ca’ Bembo, Bottacin, Foscari, Dolfin. Climate parameters quality indicators used discuss the atmospheric influence calculate related theoretical recession rate. Graphic assessment, surface profiling, digital microscopy, infrared spectroscopy, x-ray fluorescence assess textures degradation patterns associated with decay. The morphological analysis via profiling using silicon mould, digitization statistical roughness is proposed for assessment deterioration. In particular, methodology understanding variations relation such as sites, exposure (sheltered or exposed area), location (overlooking a Canal inner court). increasing rain amount intensity, decreasing SO2 NOx concentrations, rate compatible an urban environment (around 8 μm/year) calculated. sites evidences role original texture finish, facade specific formation crusts eroded area. Buildings not recently restored (Ca’ Bottacin Bembo) present thick dendritic crusts, particular court side sheltered positions. Foscari surfaces, subjected cleaning intervention after 2000s, show thin grey crust only areas, reflecting reduced presence SO2. Large areas have been found wash-out action high levels NOx.