Oxidación de sulfuros en pizarra ornamental: tratamientos protectores con siloxanos

Rivas, T.; Iglesias, José; Taboada, J.; Vilán, José Antonio Vilán

doi:10.3989/mc.2011.53109

Cited by 6 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…El número de medidas se hizo de acuerdo con la metodología desarrollada por Sanmartín et al (26). Los cambios de color se midieron siguiendo el procedimiento expresado en la norma EN ISO 105-A05:1997 (27), calculando la diferencia de color (ΔE*) según la fórmu-la [2]: que indica el grado total del cambio de color, sin determinar la dirección ni el sentido. Las diferencias de color (ΔE*) se compararon con los valores de la escala de grises normalizada (28) que asocia diferencias de color al ojo humano con un número (GSc) dentro de la escala de grises.…”

Section: Norma En 11507:2007 Exposición a Los Rayos Uvunclassified

“…La mayor variación en C* también es para FNS, con -0,33, así como la menor variación, -0,10, que corresponde a su vez a GON. En lo que se refiere a las diferencias en la escala de grises GSc, FNS muestra el mayor cambio (2,26), que se corresponde a un ligero cambio apreciable por el ojo humano, mientras que las otras tres pizarras muestran cambios apreciables (GON) o en el límite de apreciación (ALS y MOR).…”

Section: Alterationsunclassified

“…A surface of 15 x 15 cm was randomly selected in every sample, taking images before and after the tests in order to quantify the growth of alterations. ΔE* = ((ΔL*) 2 + (Δa*) 2 + (Δb*) 2 ) 1/2 [2] 4. RESULTADOS…”

Section: Digital Image Analysismentioning

confidence: 99%

“…The number of measurements was made in accordance with the methodology developed by Sanmartín et al (26). Color changes were quantified following the procedure set forth in EN ISO 105-A05:1997 (27), by calculating the energy increase (ΔE*) with the formula [2]:…”

Section: En 11507:2007 Exposure To Fluorescent Uvmentioning

confidence: 99%

See 3 more Smart Citations

Ensayos normativos para la caracterización de patologías en pizarras para cubiertas

Cárdenes¹,

Mateos²,

Ordóñez³

et al. 2011

Mater. construcc.

View full text Add to dashboard Cite

Section: Norma En 11507:2007 Exposición a Los Rayos Uvunclassified

Section: Alterationsunclassified

Section: Digital Image Analysismentioning

confidence: 99%

Section: En 11507:2007 Exposure To Fluorescent Uvmentioning

confidence: 99%

See 2 more Smart Citations

Ensayos normativos para la caracterización de patologías en pizarras para cubiertas

Cárdenes¹,

Mateos²,

Ordóñez³

et al. 2011

Mater. construcc.

View full text Add to dashboard Cite

“…One of the aesthetic parameters of a building stone is its colour, which contributes greatly to its ornamental value. As with other properties, colour monitoring is of great importance to evaluate treatment effectiveness when the stone is subjected to conservation or restoration treatment [10][11][12][13][14][15][16], to assess changes by accelerated ageing tests [16][17][18][19][20][21][22] and to in situ deterioration in the building [3,[23][24][25][26][27][28][29]. In most of the works cited, stone building materials, after the application of conservation treatments (waterproofing, consolidation, desalination, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Artificial Freeze/Thaw and Thermal Shock Ageing, Combined or Not with Salt Crystallisation on the Colour of Zamora Building Stones (Spain)

et al. 2022

View full text Add to dashboard Cite

After subjecting Zamora building stones to accelerated ageing tests, colour changes were studied, namely: (a) freezing/thawing and thermal shock (gelifraction and thermoclasty), and (b) combination of freezing/thawing plus thermal shock and salt crystallisation (sulphates or phosphates) (gelifraction, thermoclasty and haloclasty). Zamora building stones are silicified conglomerates (silcretes) from the Cretaceous that show marked colour changes due to the remobilisation of iron oxyhydroxides. In this work, four varieties were: white stone; ochreous stone; white and red stone; and purple stone Their micromorphological characterization (skeleton, weathering plasma and porosity/cutan) is formed of grains and fragments of quartz and quartzite as well as by accesory minerals muscovite and feldspar (more or less altered), and some opaque. Quartz, feldspar and illite/mica were part of the skeleton; kaolinite, iron oxyhydroxides, and CT opal were part of the weathering plasma or cutans; their porosity were 11.7–8.7%. Their chromatic data have been statistically analysed (MANOVA-Biplot). They showed higher variations in ΔE*, ΔL*, Δa* and Δb*on combined freezing/thawing plus thermal shock and sulphates crystallisation leading to rapid alteration of the building stones. Chromatic differences between the other two artificial ageing tests were less evident and were not detected in all samples. The global effect of ageing on the Zamora building stones darkened them and reduced their yellowing. The ochreous stone suffered the least variation and the purple stone the most. This study of the colour by statistical analyse may be of interest for the evaluation and monitoring of stone decay, which is an inexpensive, simple, easy and non-destructive technique.

show abstract

Measuring the Effectiveness and Durability of Silicified Sandstones and Conglomerates from Zamora, Spain Subject to Silico-organic Treatments and/or Freezing/Thawing Processes

et al. 2021

View full text Add to dashboard Cite

Oxidación de sulfuros en pizarra ornamental: tratamientos protectores con siloxanos

Cited by 6 publications

References 13 publications

Ensayos normativos para la caracterización de patologías en pizarras para cubiertas

Ensayos normativos para la caracterización de patologías en pizarras para cubiertas

Effect of Artificial Freeze/Thaw and Thermal Shock Ageing, Combined or Not with Salt Crystallisation on the Colour of Zamora Building Stones (Spain)

Measuring the Effectiveness and Durability of Silicified Sandstones and Conglomerates from Zamora, Spain Subject to Silico-organic Treatments and/or Freezing/Thawing Processes

Contact Info

Product

Resources

About