Abstract
In this work, we studied the colorimetric characteristics (in the RGB color system) of Portland cement, lime, chalk, fly ash and slag, as well as binary and triple Portland cement systems with mineral additives (5÷30%). Color was evaluated with smartphones (Huawei); several digital software packages for mobile devices were tested for digital image processing. BaSO 4 powder was used as a reference sample (white standard). It has been confirmed that digital colorimetry control using smartphones can be used for the rapid detection of mineral additives in cement that differ from Portland cement in color parameters. To quantify the composition of binary mixtures of cement with chalk and fly ash, linear calibration functions F’ I = a + bW are suitable for all three color components F’ R , F’ G and F’ B with a high approximation reliability value ( R 2 ≥ 0.95). For mixtures of cement with lime, the slope of the straight lines and the determination coefficient ( R 2 ≥ 0.92) are also sufficient for quantitative estimates of the content of the additive in the mixture. It is impossible to confidently determine slag additives by the color parameters in cement due to too insignificant difference in the color indicators of cement and slag. For cements containing two mineral additives, their presence can be detected colorimetrically using binomial calibration functions if the composition of the additives is known. It is also possible to evaluate “a lot” or “a little” if the range of color values of cement of the corresponding brand is known. Values above or below this range will indicate the presence of mineral additives. The presented method for controlling the color of cement products is characterized by ease of response, low cost and speed of analysis. Keywords: digital colorimetry, RGB color system, cement, mineral additives DOI: http://dx.doi.org/10.15826/analitika.2020.24.2.003 O.B. Rudakov, O.V. Chernousova, R.G. Cherepakhina, Ya.O. Rudakov Voronezh State Technical University, ul. 20-letiya Oktiabria, 84, Voronezh, 394006, Russian Federation
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