Laboratory exposure systems to simulate atmospheric degradation of building stone under dry and wet deposition conditions

Multivariate Gaussian subspatial regression applied to predict the effect of phosphate crystallization aging on the color in silicious conglomerates

“…One of the aesthetic parameters of a building stone is its color, which strongly contributes to its ornamental value. Similar to other properties, monitoring of color is important for assessing the effectiveness of a treatment and to judge the changes that occur when using artificial aging tests . To predict the expected decaying processes that occur in stone materials, it is very necessary to anticipate problems that may arise from accelerated aging.…”

“…Similar to other properties, monitoring of color is important for assessing the effectiveness of a treatment and to judge the changes that occur when using artificial aging tests. [1][2][3][4][5][6][7] To predict the expected decaying processes that occur in stone materials, it is very necessary to anticipate problems that may arise from accelerated aging. To address this, currently climatic chambers are being used for carrying out aging experiments under controlled conditions.…”

Crowd-sourced mobile phone images for heritage conservation monitoring

“…Other studies look at changes due to soiling and weathering [4,5,10,14,15,16] and laboratory S02 acid aging [17]. In general, literature values are ®E76 �[1-20] �®L* [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], ®a* �[3-1 0] and ®b* � [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…In general, literature values are ®E76 �[1-20] �®L* [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], ®a* �[3-1 0] and ®b* � [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Our conclusion is that the current accuracy of cell phone cameras is sufficient to be a useful tool for automated monitoring of change in built heritage.…”

Salt-weathering simulations under hot desert conditions: agents of enlightenment or perpetuators of preconceptions?

“…At one level, this has been effectively achieved by hand spraying a saline aerosol either onto test blocks or into the experimental chamber (Smith and McGreevy, 1988;Goudie and Parker, 1998;Goudie et al, 2002). However, following on from studies that constructed chambers to simulate wet and dry deposition of acid pollutants on building stones (e.g., see Johnson et al, 1990), commercially available salt corrosion cabinets can now be used to create a fine saline mist that ensures uniform deposition of known amounts of salt solution onto test blocks. For example, Smith et al (2002) used a corrosion cabinet to repeatedly deposit a 10% magnesium sulphate aerosol onto different quartz sandstones that were then subject to bNegevQ type heating and cooling cycles (Goudie, 1993).…”