Color changes in the surface of granitic materials by consolidated and/or water repellent treatments

Iñigo, Adolfo C.; Tavera, Santiago Vicente; Rives, V.; Vicente, M. A.

doi:10.1002/(sici)1520-6378(199704)22:2<133::aid-col8>3.3.co;2-7

Cited by 10 publications

(12 citation statements)

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“…Colour is a parameter that must be currently controlled to monitor the quality a quarry rock when it is used in a monument, both as regards its deterioration due to environmental (Sebastián-Pardo and Zezza, 1998;Zezza, 2002a) and microenvironmental factors in certain zones of buildings (Zezza, 2002b) and after the application of conservation treatments (García-Talegón et al, 1998;Iñigo et al, 1997Iñigo et al, , 2004). …”

Section: Introductionmentioning

confidence: 99%

Colour and ultrasound propagation speed changes by different ageing of freezing/thawing and cooling/heating in granitic materials

Iñigo

Talegón

Tavera

et al. 2013

Cold Regions Science and Technology

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In the present work we determined the chromatic coordinates (L*,a*,b*) and ultrasound propagation speeds on the three spatial planes (V x ,V y ,V z ) of three ornamental granites (Aqueduct of Segovia, Spain) before, during, and after being subjected to 70 cycles of two types of accelerated ageing (typical of cold regions): a) freezing/thawing and cooling/heating (T1), and b) freezing/thawing and cooling/heating + salt crystallization (T2). A multivariate technique (Canonical Biplot) was applied to the data obtained, with the observation of significant variations between the two types of accelerated artificial ageing as compared with those obtained in quarry rock in the three chromatic *Manuscript Click here to view linked References 2 coordinates (L*,a*,b*). With regard to the ultrasound propagation speed, we only detected differences in the results of the T2 artificial ageing treatment with respect to those of quarry rock. This fact is confirmed by the estimated data of resistance to compression.

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Section: Introductionmentioning

confidence: 99%

Colour and ultrasound propagation speed changes by different ageing of freezing/thawing and cooling/heating in granitic materials

Iñigo

Talegón

Tavera

et al. 2013

Cold Regions Science and Technology

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“…In the dimensional stone industry, common terms are usually used for rock color characterization, such as gray, pink, red, black (and the related terms, like pinkish), but the concept of such colors is different from one person to another, and commercial conflicts are frequent because of the lack of a precise language. The use of an automatic color classification, such as the CIE system, is widespread in research [4][5][6][7][8] because it adds consistency in color assessment.…”

Section: Introductionmentioning

confidence: 99%

Color assessment of granitic rocks and implications for their ornamental utilization

Sousa

Gonçalves²

2011

Color Research & Application

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The purpose of this study is to evaluate the factors affecting the assessment of granite color, such as grain size and texture, and to propose a methodology for this task which would reduce the margin of error associated with this procedure. For this purpose, an evaluation was carried out on the color of several granites with different textures used in the dimensional stone industry to highlight the importance of the sample area, the number of measurements per sample and the aperture of the equipment. A colorimeter was used to measure the granite color according to the

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“…In the past, polymeric resins such as silicones [14], acrylic resins [15], and fluorinated polymers [16] have often been employed as consolidants to conserve sandstone relics. However, these materials either provide insufficient protection, exhibit poor weatherability, or both [17].…”

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Conservation of weathered historic sandstone with biomimetic apatite

et al. 2012

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The conservation of weathered historic sandstone with apatite was studied. Based on the growth mechanism of bone, calcium and phosphorus were introduced into weathered sandstone and then mineralized at room temperature. The conservation efficiency was investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and compressive strength, capillary water uptake, water vapor permeability and weather resistance tests. The SEM, EDX, TEM, SAED and XRD results showed that the produced hydroxyapatite could reunite the weathered stone blocks and provide sufficient reinforcement to hold them together. The results of the various tests indicated that the compressive strength and weather resistance of the treated samples was improved significantly. In addition, because of the porous nature of apatite, the water vapor permeability of the treated stone was not affected and its breathability was maintained.

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Color changes in the surface of granitic materials by consolidated and/or water repellent treatments

Cited by 10 publications

References 0 publications

Colour and ultrasound propagation speed changes by different ageing of freezing/thawing and cooling/heating in granitic materials

Colour and ultrasound propagation speed changes by different ageing of freezing/thawing and cooling/heating in granitic materials

Color assessment of granitic rocks and implications for their ornamental utilization

Conservation of weathered historic sandstone with biomimetic apatite

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