The structure of filled cementitious composite materials is formed as a result of hardening with the formation of a crystalline framework. The filler is involved in the building material crystal system structure formation. Chemically active fillers promote intensive release of hydration products that bind into insoluble compounds and increase the system stability. When developing the formulations for dry building mixtures, it is effective to use several fillers with different properties that complement each other, and biocidal additives increasing the materials resistance to environment effects formed by mold fungi. To create modified dry building mixtures based on cement binder, materials such as filler made of quartz sand of various fractions, fillers chrysotile and clinoptilolite and biocidal additives of the Teflex series were used. The composition with sand grains of 0.16–0.315 mm in size showed high strength properties in bending and compression. The introduction of chrysotile in an amount of 3% by weight of cement and quartz sand with a particle size of 0.16–0.315 mm increases the compressive and flexural strength by 7 and 13%, respectively, compared with the control composition. Clinoptilolite, introduced in an amount of 20% of the cement mass instead of one of the quartz sand fractions, increases the compressive strength of the composites up to 5%. The introduction of the Teflex series additives in the amount of at least 1% by weight of the binder ensures the composites’ fungal resistance. The additive “Teflex disinfectant” in an amount of at least 3% of the cement mass gives the composites fungicidal properties, the zone of no fungal growth on the nutrient solution near the infected samples is 4 mm.
1Мордовский государственный университет им. Н.П. Огарёва, г. Саранск, РОССИЯ 2 Всероссийский научно-исследовательский институт авиационных материалов ГНЦ РФ, г. Москва, РОССИЯ Аннотация: В работе приводятся результаты испытаний цементных композитов в условиях воздействия на них повышенной влажности и переменных положительных температур. По коэффициенту изменения твердости (стойкости) сравниваются составы с различными наполнителями, пластифицирующими и дру-гими фунгицидными добавками. Для принятия решения о стойкости (устойчивости) структуры и свойств композитов предлагается опираться на величину площади многоугольника, полученного в результате ку-сочно-линейной аппроксимации точек экспонирования. Даются объяснения влияния факторов среды на изменение твердости композитов.Ключевые слова: композиты, влажность, положительные температуры, коэффициент стойкости, площадь многоугольника, составы композитных материалов, устойчивость, относительные значения, кусочно-линейная интерполяция RESEARCH OF BEHAVIOR OF CEMENT COMPOSITES IN CONDITIONS OF HIGH HUMIDITY AND VARIABLE POSITIVE TEMPERATURES Abstract:In this paper, the results of testing cement composites under the conditions of the effect of high humidity and variable positive temperatures are given. By the coefficient of variation of hardness (stability), the compositions are compared with various fillers, plasticizing and other fungicidal additives. To decide on the stability (stability) of the structure and properties of composites, it is proposed to rely on the area of the polygon obtained as a result of piecewise linear approximation of the exposure points. Explanations of the influence of environmental factors on hardness change of the composites.Keywords: composites, humidity, positive temperatures, coefficient of stability, polygon area, compositions of composite materials, stability, relative values, piecewise linear interpolation Цементные композиты во время своей экс-плуатации могут подвергаться воздействию различных климатических факторов. Основ-ными из них являются влажность и темпера-тура окружающей среды. Эти факторы могут действовать в различном сочетании. Есть и такие воздействия, когда можно считать, что один из этих факторов в течение суток оста-ется постоянным, а второй меняется. Оче-видно, что в этом случае задача по определе-нию влияния составляющих окружающей
The article considers determining the stability assessment of the structural and brightness properties of raster images. The stability assessment refers to the ability of preserving the image properties due to the original image processing by filtering. Halftone versions of the full-color images presented in the RGB color space are accepted as original images. The grayscale images are filtered using the Gaussian, Wiener, and median filtration algorithms. The next step is to use one of the variants of the SSIM algorithm to obtain the structural similarity index between the control halftone image and the filtered image. In order to create a relative and dimensionless metric there has been calculated the area of the polygon S set by the values of the similarity indices relative to the control grayscale image, and the area of the rectangle Sp that contains the area of the polygon S. Images from the international image database TID2008 (image database 2008), TID2013 (image database 2013) were taken as test bitmaps. The official coats of arms of the Russian Federation entities – territories, regions, republics, etc. - were also considered. The resulting stability score is determined either as the geometric mean of the four calculated values, or as their arithmetic mean. The results of testing the groups of bitmap images that are united by a common theme or purpose are presented. From each group of images, the maximum and minimum values of the estimates of the image stability to structural and brightness changes are determined in accordance with the developed heuristic algorithm. The results obtained can be used for comparative evaluation of competing images in order to select the most resistant to structural and brightness changes.
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