PSI - Issue 22

J. Gonçalves et al. / Procedia Structural Integrity 22 (2019) 181–188 187 Lígia T. Silva, Bruno Mendes, Carlos Oliveira, Cristina Reis, Paula Silva; José Silva / First International Symposium on Risk and Safety of Complex Structures and Components (2019), Porto, Portugal Table 2 - Variation of parameter L in White Micaela and Grissal granite. Granito Branco Micaela Granito Grissal Polished 64.98 62.5 ± 1.4 Honed 69.81 67.1 ± 1.4 Sawn 70 66.5 ± 1 Flamed 73.10 71.3 *it was not studied shot blasted finish in Grissal granite Brightness : For this physical parameter it is found that only the polished finish (for 20º - high gloss surfaces, 60º - intermediate gloss surfaces and 85º - matte low gloss surfaces) and softened (only for 85º- surfaces with low gloss (matt) feature gloss. For the blasted, flamed and sawn finishes, the brightness is basically non-existent. The negative results that appear in the measurements are related to the device error, since there is no brightness associated, the values are null. Conclusions This study made it possible to quantify the colour and the brightness of Branco Micaela granite subjected to different finishing processes - Polished, Softened, Blasted, Flamed and Sawn. As it was observed, the surface finishing has a high importance for new commercial approaches. The main results of this study are: -The flamed, shot blasted and sawed finishes don’t present gloss ; -In different finishes, and considering colour, the parameter L is the only one that shoes some variation; -Polished finish presents gloss. 4. CIE (1995). Industrial colour-difference evaluation. CIE Pub. 116, Commission International de L’Eclairage, Vienna. Frazão, M. (2005). Análise do Processo de Serragem através de Engenhos de Lâminas Diamantadas, Dissertação para a obtenção do grau de Mestre em Engenharia Geológica e de Minas, Instituto Superior Técnico. Gonçalves, B., & Sousa, L. (2010). Avaliação das Características de Superfície em Granitos Polidos. . Vila Real: Departamento de Geologia da Universidade de Trás-Os-Montes e Alto Douro. Gonçalves, J., Braga, P., Oliveira, C., Correia, J., Silva, J., Reis, C. (2019) Contribution Evaluation of “Branco Micaela” g ranite used in facades, for the safety of workers, Book-chapter #90, SHO 2019 - International Symposium on Occupational Safety and Hygiene Grossi, C. M., Brimblecombe, P., Esbert, R. M., & Alonso, F. J. (2007). Colour changes in architectural limestones from pollution and cleaning. Colour Research & Application: Endorsed by Inter‐Society Color Council, The Colour Group (Great Britain), Canadian Society for Colour, Colour Science Association of Japan, Dutch Society for the Study of Color, The Swedish Colour Centre Foundation, Colour Society of Australia, Centre Français de la Couleur, 32(4), 320-331. Hill, B., Roger, T., & Vorhagen, F. W. (1997), Comparative analysis of the quantization of colour spaces on the basis of the CIELAB colour-difference formula. ACM Transactions on Graphics (TOG), 16(2), 109-154. Pietro, B., Sanmartin, P., Silva, B. (2011). Effect of Surface Finish on Roughness, Colour, and Gloss of Ornamental Granites, Journal of Materials in Civil Engineering 23(8) · August 2011 Rojo, A., Alonso, F. J., and Esbert, R. M. (2003). “Hydric pro perties of some Iberian ornamental granite with different superficial finishes: A petrophysical interpretation.” Mater. Construcc., 53(269), 61– 72. Shehata, W., El Mukhtar, M., & Badiuzaman, M. (1990). Evaluation of some dimension stone occurrences in Saudi Arabia. , pp. pp. 2987-2992. References