Application of protective products to “Noto” calcarenite (south-eastern Sicily): a case study for the conservation of stone materials

Russa, Mauro Francesco La; Barone, Germana; Belfiore, Cristina Maria; Mazzoleni, Paolo; Pezzino, Antonino

doi:10.1007/s12665-010-0614-3

Cited by 45 publications

(19 citation statements)

References 31 publications

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“…The SW product, applied in a double quantity, yielded similar results. In both these cases, the measured ΔE*ab were higher than 3, the value referred as perceivable by a human eye, but still below the threshold (ΔE*ab ≤ 5) judged tolerable in conservation interventions of built heritage [46,49,50]. Actually, a weak yellowing of the treated PS surfaces was observed ( Figure 5), also supported by the increase in the b* parameter (Table 4).…”

Section: Stone Support Treatment Actual Applied Amount (G Mmentioning

confidence: 72%

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

et al. 2018

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Conservation strategies to limit the degradation of stone materials are being constantly developed. To this aim, new materials are designed to confer hydrophobic properties and anti-graffiti protection to the treated surfaces. Hybrid nanocomposites, based on inorganic nano-particles added to an organic matrix, have been recently proposed for treatments of stone surfaces, obtaining promising and innovative properties. In the present paper, an experimental product based on fluorine resin containing SiO2 nano-particles, a commercial fluorine-based product and a silicon-based material were applied as protective coatings on two calcareous stones (compact and porous) widely employed in the Mediterranean region. All the studied products are expected to provide both water and anti-graffiti protection to both stones’ surfaces. The rheological characterization of the liquid products, changes in color of the surfaces, and variations in water vapor permeability allowed the compatibility of the protective systems applied to stones to be evaluated. Water–stone contact angle measurements and water absorption by capillarity were used to control the action against water ingress. The oleophobicity was assessed by measuring the oil–stone contact angle. The experimental nano-filled product proved to be a suitable hydrophobic coating for compact and porous stones; furthermore, it provides high oleophobicity to the treated surfaces, as required for anti-graffiti systems.

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Section: Stone Support Treatment Actual Applied Amount (G Mmentioning

confidence: 72%

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

et al. 2018

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“…5) determined minimal modifications of chromatic variations on the surfaces T1 and C1, with the values of DE Ã ab < 2, the other values also being in accordance with the colorimetric studies. 7,8 It should also be mentioned that, throughout all the investigations, the water content from the surface of the samples varied insignificantly, with values between 0.10 and 0.14% for terracotta, and, respectively, 0.20 and 0.27% for calcareous material (Supporting Information Tables I and II). In this case, the humidity of surfaces did not influence the chromatic deviation of the areas being investigated.…”

Section: Resultsmentioning

confidence: 97%

“…In the case of colorimetric measurements realised throughout UV radiation exposure, one can observe that, in a 24 h interval (Supporting Information Table II), the UV radiations with a predominant wavelength of 365 nm (Fig. ) determined minimal modifications of chromatic variations on the surfaces T1 and C1, with the values of Δ

E_{a b}^{*}

< 2, the other values also being in accordance with the colorimetric studies …”

Section: Resultsmentioning

confidence: 99%

Preliminary investigation of various old geomaterials treated with hydrophobic pellicle

Pelin

Sandu

Gurlui

et al. 2016

Color Research & Application

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The purpose of this article is to evaluate the aesthetic and chromatic impact of hydrophobic treatments carried out on a series of old geomaterials, dating back to the XVII and XIX centuries. The materials in question have been utilized in the construction of two historic monuments. Throughout the evaluation proceedings regarding the state of conservation of the monuments in question, a number of porous surfaces were identified, such as calcareous rock and ornamental terracotta. The aim of the article is to evaluate the hydrophobic degree obtained by applying certain pellicles, in keeping with the modern principles of scientific conservation. During the experiments, an array of different commercially available hydrophobic additives was used. The tests were performed in laboratory conditions, with the purpose of presenting the chromatic interaction between surface and product. The main techniques used for the analysis during the experiments were: CIE L* a* b*, OM and exposure to UV radiation in laboratory conditions. The results obtained are analyzed and discussed, with the purpose of evaluating the efficiency of hydrophobic solutions, taking into consideration the chromatic deviation, as compared to exposure to UV radiation. © 2016 Wiley Periodicals, Inc. Col Res Appl, 41, 317–320, 2016

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“…2). Exposure to UV radiation was mainly done at a wavelength of 300 to 365nm, using four lamps with mercury vapor under pressure (Osram ® Ultra Vitalux -300W -230V), with the artificial stone aging standard UNI 10925/2001 as a starting point, which recommends the use of mercury vapor lamps for the simulation in time of the solar spectrum, under laboratory conditions [21][22][23].…”

Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

Preliminary Evaluation of Coating Hydrophobization of Natural Stone from Repedea - Iasi area (Romania)

Pelin¹,

Radinschi²,

Ciocan³

et al. 2020

Rev. Chim.

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Given the need for the development of interdisciplinary studies and research, including in the Engineering field and in the Building sector, this paper suggests a multidisciplinary approach to the maintenance of lithic surfaces, by analyzing some high-performance building materials and products, such as hydrophobization coating films. As it has been determined and acknowledged by the scientific community worldwide, the main aggression factor affecting the geomaterials used in the construction of heritage assets is represented by water and/or excessive humidity, especially in the case of the use of porous limestone, such as those available in the Repedea -Iasi area (Romania). Therefore, in order to ensure better maintenance of a lithic calcareous material of this type, it is necessary to use a hydrophobic preventive treatment. The findings of the research conducted and described in this paper represent one of the first steps on the path to standardization regarding the confirmation of the efficiency of the hydrophobization products, which have been increasingly present on the Romanian specialized market lately. Thus, this paper is addressed to all the specialists interested in maintaining the lithic surfaces exposed to various environmental factors, as it is useful for both historical and civil constructions.Although natural stone is considered a construction material that stands the test of time, the degradation and deteriorate rate of architectural surfaces has been increasing over the last decades, especially due to anthropic causes, mainly to atmospheric pollution [1-3], but also due to intrinsic factors, by using low quality indigenous lithic materials, which favor the rapid onset of the aforementioned alterations. Such a situation is often encountered in the case of numerous historical buildings in Iasi area, erected between the XVth and the XIXth centuries, as well as during the first decades of the twentieth century, the most sought after building stones being the porous limestone in the Scheia, Pietrarie and Paun -Repedea areas located south of Iasi City.For the stone constructions in the city of Iasi, most of the building materials were found in the surrounding areas of the city [4], where the geological context allowed the formation of porous sedimentary rock deposits [5,6]. Therefore, as lithic materials used in constructions, sedimentary rocks in Iasi area have relatively low strength and durability [7-10], and for this reason their use in the maintenance and/or restoration processes of historical buildings requires a series of in-depth studies and research, with reference to the choice of stone and the development of an appropriate protocol that clarifies a number of issues, such as [11]: a) spot/area in the building requiring restoration works; b) extent of current (active) damages and degradations; *

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Application of protective products to “Noto” calcarenite (south-eastern Sicily): a case study for the conservation of stone materials

Cited by 45 publications

References 31 publications

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

Preliminary investigation of various old geomaterials treated with hydrophobic pellicle

Preliminary Evaluation of Coating Hydrophobization of Natural Stone from Repedea - Iasi area (Romania)

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