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New tool constructions for polishing surface of granite facing tool program in construction
Published in Evgeny Rybnov, Pavel Akimov, Merab Khalvashi, Eghiazar Vardanyan, Contemporary Problems of Architecture and Construction, 2021
P. Rajczyk, K. Bednarczyk, S. Evtyukov
In order to determine the quality of surface polishing, it is advisable to develop a methodology for measuring the degree, including the classification of surface polishing, using gloss meters. These devices are designed to measure the amount of light reflected. The principle of operation of the gloss meter is based on the fact that the device emits a beam of white, non-polarized light at a specific angle measured between the straight line parallel to the light beam and the perpendicular to the tested surface. There are devices with a geometry of 20°, 45°, 60°, 75°, 85°. The geometry in this case is the angle of light emission measured on the test surface. The light beam is reflected from the measured surface and enters the measuring device, which measures its intensity; the smaller the difference between the emitted and reflected light intensity (with the same geometry), the greater the gloss. The result of the measurement is a part (given in%) of the amount of light emitted (i.e. 100%) by the gloss meter. Often the percentage (%) is converted into points (points) for simplicity. In order to obtain the correct measurement results, the following rule is applied: for high gloss, low measurement geometry (20° angle) is used, and for low-gloss, matt surfaces, high geometry (85° angle). The basic standards for measuring gloss are defined in the following standards: ASTM D 2457, DIN EN ISO 2813 and DIN 67530.
Laboratorial Study of the Combined Effect of SO2 and High-Temperature Ageing on the Physical and Mechanical Properties of Encostinha Marble, a Portuguese Stone
Published in International Journal of Architectural Heritage, 2023
Edite Martinho, Amélia Dionisio, Ana Sofia Angélico
A specular glossmeter Rhopoint Novo-Gloss Lite was used to evaluate the sample’s surface gloss (gloss units [GU]) at a reflection angle of 60° (as recommended for matte surfaces) and it ranges from 0 to 100. On each sample, 12 random readings were taken and the mean values and standard deviations were calculated. The equipment was calibrated using a standard highly polished black glass.