Experimentation of Earth-Gypsum Plasters for the Conservation of Earthen Constructions

Mattone, Manuela; Rescic, Silvia; Fratini, Fabio; Fà, Rachele Manganelli Del

doi:10.1080/15583058.2017.1290850

Cited by 21 publications

(12 citation statements)

References 5 publications

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“…Therefore, tested stainless steel samples with the CNTs layer (unwashed) were evaluated using contact angle and values of the contact angle were reported in Table 7 . The surface of all samples, including that for clean metal without the CNTs layer, are revealed to be hydrophilic since the values of the contact angle were less than 90° [ 72 ]. This was due to the attachments of GA molecules to the hydrophobic surface of CNTs.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

2020

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The inhibition behavior of carbon nanotubes (CNTs) and Gum Arabic (GA) on the corrosion of 316L stainless steel in CNTs–water nanofluid under the effect of different temperatures was investigated by electrochemical methods and surface analysis techniques. Thereby, 316L stainless steel samples were exposed to CNTs–water nanofluid under temperatures of 22, 40, 60 and 80 °C. Two concentrations of the CNTs (0.1 and 1.0 wt.% CNTs) were homogenously dispersed in deionized water using the surfactant GA and tested using three corrosion tests conducted in series: open circuit test, polarization resistance test, and potentiodynamic scans. These tests were also conducted on the same steel but in solutions of GA-deionized water only. Tests revealed that corrosion increases with temperature and concentration of the CNTs–water nanofluids, having the highest corrosion rate of 32.66 milli-mpy (milli-mil per year) for the 1.0 wt.% CNT nanofluid at 80 °C. In addition, SEM observations showed pits formation around areas of accumulated CNTs that added extra roughness to the steel sample. The activation energy analysis and optical surface observations have revealed that CNTs can desorb at higher temperatures, which makes the surface more vulnerable to corrosion attack.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

2020

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“…The gypsum used in this experiment is a commercial one usually identified with the Italian name "scagliola" but commonly known as plaster of Paris and consists of white powder of calcium sulfate hemihydrate: CaSO 4 •0.5H 2 O (bassanite). Gypsum has been employed as a soil stabilizer that creates a crystalline network with clays that add rigidity [6,23,24,34,48,49]. Furthermore, during the setting phase, it increases in the volume of about 0.5% [50], contrasting earthen shrinkage during the drying phase.…”

Section: Methodsmentioning

confidence: 99%

Earthen Plasters Stabilized through Sustainable Additives: An Experimental Campaign

et al. 2021

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The earthen architecture widely spread in many countries of Europe, America, Asia, Africa, testifies to a particular material and immaterial culture. Nevertheless, it is a fragile heritage, which needs continuous maintenance. To encourage the preservation of such evidence of building techniques, an experimental campaign aimed at the development and evaluation of the performances of protective earthen plasters was undertaken. The durability of the plasters was improved through the addition of different additives, some of them traditional (such as lime and gypsum) and others innovative (geopolymers, enzymes), and resulting from industrial wastes (cement kiln dust). These additives have been selected considering low production costs and a reduced environmental impact, to improve the sustainability of the interventions. The performances of the earthen plasters in terms of efficacy (resistance to water erosion, water absorption, drilling, thermo-hygrometric cycles) and compatibility (changes in color and water vapor permeability) have been evaluated. Good performances were obtained by the different mixtures and, in particular, by those stabilized with gypsum. The results of this experimentation could find a useful application in the preservation of both ancient and new earthen built heritage.

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“…En segundo lugar, la prueba de cohesividad puso de manifiesto el incremento en esta propiedad en el orden del 13,33% al haber pasado la ruptura promedio de las barras de los 7,5cm en la formulación con agua, a los 8,5cm al usar la solución de glicerina. La cohesividad es una cualidad muy relevante en lo que concierne a la aplicación de revestimientos pues, al ser más dúctiles, pueden comprimirse mejor, con lo que se obtienen superficies más densas, resistentes y mejor adheridas a los sustratos (Mattone et. al., 2017).…”

Section: Recomendacionesunclassified

Análisis comparativo de normativas arquitectónicas en estaciones de bomberos de Chile, Colombia, Venezuela y Perú

Guerrero¹,

Avila-Boyas²,

García-Alonso³

2022

est

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Recientemente ha habido un incremento significativo en la generación de glicerol, que es un subproducto de diversos procesos industriales y que, por sus cualidades aglutinantes, tiene potencial de empleo en la aplicación de revestimientos de tierra para mejorar su resistencia y durabilidad. En este artículo se documenta una serie de análisis comparativos de morteros de tierra natural y otros estabilizados con glicerol, para caracterizar la cohesividad, cantidad de agua de mezclado requerida y resistencia a las afectaciones hídricas por absorción capilar e intemperismo, que son los factores que más afectan a los revoques. Se pudo verificar un incremento en la tenacidad de los morteros estabilizados, una disminución en la cantidad de líquido necesario para mezclar y una adecuada resistencia a la absorción, tanto en laboratorio como en muestras expuestas a la intemperie. El glicerol demostró ser un recurso económica y ecológicamente sostenible para mejorar los revoques de tierra.

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Experimentation of Earth-Gypsum Plasters for the Conservation of Earthen Constructions

Cited by 21 publications

References 5 publications

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

Earthen Plasters Stabilized through Sustainable Additives: An Experimental Campaign

Análisis comparativo de normativas arquitectónicas en estaciones de bomberos de Chile, Colombia, Venezuela y Perú

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