The volumetric decaiment in worked stones subjected cycles of crystalization, uses through digital photogrametry
Abstract
The possibility of monitoring the volume of stones deteriorated by accelerated aging cycles has been formulated, as a complement to the records using dry weight, since the latter is altered in the first cycles by up to 10% due to the formation of internal crystals, in the porous network of the samples. For this, five samples of volcanic Tuff stones have been deteriorated through crystallization cycles with a 12% concentrated sodium sulfate brine at room temperature ranging between 18 and 20 ° C. Data collection occurs in two categories: first in “cycles” involving dry weight and volume by photogrammetry; and second in “periods” that involves dry weight, volume by Archimedes’ principle and volume by photogrammetry. With this, it has been observed that the volume is also affected by the crystallization of salts, presenting an increase in the first three cycles, in addition, the ability of photogrammetry to acquire the volume of small-scale objects has been demonstrated, achieving a percentage error lower than that of 4%.
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References
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