La composición mineralógica de la arenisca y su influencia en la deposición de dióxido de azufre

Müller, Urs

doi:10.3989/mc.2008.v58.i289-290.86

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…In particular, the clast/crystal size could be an important factor in the different alteration processes observed in the four types of rock studied (Gauri et al, 1982): in the rocks with a smaller grain size such as TA, AR and especially MR, more gypsum appeared, something that seemed to occur regardless of the type of rock, given that in MR much smaller amounts of calcite were available compared to any of the other three types. According to Müller (2008), under exposure to acid conditions calcium may also be released by feldspars and clays, phases of which are present in MR, so favoring the precipitation of gypsum. It has also been shown that when the solution contains iron oxides, these facilitate the absorption of the SO 2 and act as catalysts (Charola and Ware, 2002), so giving rise to calcium sulfate (Elfving et al, 1994b).…”

Section: Roughnessmentioning

confidence: 99%

Influence of Surface Finishes and a Calcium Phosphate-Based Consolidant on the Decay of Sedimentary Building Stones Due to Acid Attack

et al. 2020

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Natural stone has long been used as a building material because of its physical-mechanical resistance and its esthetic appeal. However, over the last century increasing industrial activity has produced more acidic environments, such as polluted urban areas, that can cause serious damage to many buildings and historic monuments, and in particular those made with carbonate rocks, which are most prone to decay. In order to mitigate the physicochemical processes that degrade these buildings, a number of phosphate-based consolidants have been developed, which are highly compatible with the carbonated substrate. Research about the role of the surface and its different possible finishes in the transmission of the agents that damage or protect the stone would therefore be very useful, both when choosing the most suitable stone for new constructions and when restoring historic buildings. The main objective of this research was to determine whether the roughness of three types of surface finish (sawcut, honed and bush-hammered) influences the durability of four types of natural stone (two calcarenites, one travertine and one sandstone) widely used in Andalusia (Spain). The efficacy of a calcium phosphate-based consolidant as a mitigator of deterioration in polluted urban environments was also studied and to this end the physical properties of untreated and treated samples were measured and compared. The samples were exposed to artificial atmospheres with SO 2 pollution in order to assess the damage caused to each surface finish.The results indicate that all the surface finishes were vulnerable to the decay caused by acidic atmospheres, although the saw-cut finish was less affected, perhaps because it did not require additional industrial processing. The mineral composition and texture of the rocks were critical factors in terms of the amount and type of decay they suffered, and the travertine and sandstone were more resistant to deterioration than the calcarenites. Similarly, the pore system of each rock was decisive in the penetration of the consolidant. Application of the consolidant improved the behavior of the treated samples by making them more resistant to acid attack without significantly altering the water vapor permeability, the color or the roughness of the surface.

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Section: Roughnessmentioning

confidence: 99%