Influence of projection angle in sandblasting cleaning on detrictic stone materials in Architectural Heritage
DOI:
https://doi.org/10.3989/mc.2014.02113Keywords:
Conservation, Restoration, Cleaning, Micro-sandblasting, Sandstone, Differential erosionAbstract
In this research, the influence of the angle in abrasive blasting cleaning is studied on Montjuïc sandstone with black crust. After analyzing the properties of the soiling and the material, and their possible influence on the treatment, different cleaning tests were made at four different angles, keeping the complementary parameters constant. Taking the restorer’s perspective as a starting point, and in order to fulfill the practical requirements of an intervention —time and cost reduction—, tests were evaluated with USB digital microscope, stereomicroscope with 3D visualization and measurement, and colorimeter. From the results it is established that angles close to 75° minimize surface alteration, reducing differential erosion in the binding phases of detritic materials usually caused by this treatment.
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