Assessment of air abrasive cleaning on masonry stones using greyscale imaging techniques

Abstract eng:
In this study, advanced greyscale imaging analysis was conducted using the Adobe Photoshop 6 on the surfaces of masonry stones, taken from listed historic buildings, to accurately assess the effectiveness of building cleaning. Seven commonly used masonry stones and clay bricks for historic buildings were selected, together with seven abrasives adopted for air abrasive cleaning, e.g. copper slag (coarse, medium and fine), recycled glass (coarse, medium and fine) and natural abrasive. Here, only the results for granite, limestone and marble are presented. The cleaning degree at each stage was evaluated using greyscale images converted from original colour ones, where lower greyscale corresponded to dirtier surface and higher greyscale to brighter and cleaner surface. In general, greyscale continuously increased with the cleaning time and tended to be stable when the surface became fully cleaned. The abrasives with better performance were those with smaller particles sizes, i.e. the medium and fine abrasives.

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