Colour and ultrasound propagation speed changes by different ageing of freezing/thawing and cooling/heating in granitic materials |
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| Affiliation: | 1. Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA-CSIC), Spain;2. Departamento de Geología, Universidad de Salamanca, Spain;3. Departamento de Estadística, Universidad de Salamanca, Spain;4. Instituto de Ciencias de Materiales de Sevilla (ICMSE-CSIC), Spain;1. University of Colorado, Boulder, Campus Box 395, Boulder, CO, 80309, USA;2. Dartmouth College, 6188, Kemeny Hall, Hanover, NH, 03755, USA;1. Hepatobiliary Sugery Institute, Southwest Hospital, The Third Military Medical University, Chongqing, China;2. Medical Services Section, Sixteenth Hospital of Chinese People''s Liberation Army, Altay, China;1. Endocrine Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD;2. Metabolic Disease Branch, National Institutes of Digestive Disease and Kidney, National Institutes of Health, Bethesda, MD;3. Department of Surgery, Democritus University of Thrace Medical School, Alexandroupoli, Greece;4. Sackler Faculty of Medicine, Tel Aviv University, Israel;5. Department of Surgery, The George Washington University, School of Medicine and Health Sciences, Washington, DC;1. Faculty of Architecture, Delft University of Technology, Delft, The Netherlands;2. TNO, Delft, The Netherlands;3. Cultural Heritage Agency, Amersfoort, The Netherlands |
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| Abstract: | In the present work we determined the chromatic coordinates (L*, a*, b*) and ultrasound propagation speeds on the three spatial planes (Vx, Vy, Vz) 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 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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