UDK 691.57 Лакокрасочные материалы. Краски. Лаки. Олифы. Протравы. Защитные средства
GRNTI 67.09 Строительные материалы и изделия
OKSO 08.06.01 Техника и технологии строительства
BBK 383 Строительные материалы и изделия
TBK 5415 Строительные материалы и изделия. Производство стройматериалов
This study presents the results of physicochemical methods of analysis of structure and properties of one-component cement-silicate paint modified by the addition of chrysotile nanofibers on the basis of technogenic wastes of Bazhenov chrysotile 7 grade. The main purpose of adding fibers to the paint composition is to increase the heat resistance and crack re-sistance of the applied coating on the surface of silicate-based artificial stone materials. Using differential-thermal analysis it is shown that chrysotile fibers increase the thermal resistance of cement-silicate paint up to 600ºC, which is predetermined by the temperature of destruction due to dehydration of chrysotile fibers during heating. When analyzing the micro-structure of cured paint using energy-dispersion analysis it is shown that due to chemical affinity of fibers with cement-silicate matrix on the interfacial surface of fibers the formation of amorphous and crystalline phases providing reinforcement of cement-silicate matrix is provided, which, being simultaneously the centers of crystallization, provide the creation of a single conglomerate, which increases the crack resistance of coating on the basis of cement-silicate paint. During operation, simultaneous improvement of properties of cement-silicate paint is achieved due to continued hydration of Portland cement minerals, which provides compaction and adhesion of paint to the painted surface. This allows its application in an extensive temperature range without flaking, cracking and release of undesirable gaseous products. IR-spectral showed that the surface of cement-silicate paint additionally undergoes carbonization under the influence of moisture and carbon dioxide in the environment, which increases the water resistance and durability of the coating. Formation of porous structure of cement-silicate paint in the process of hardening provides vapor and mass exchange, preventing the destruction of the coating in the process of oper-ation.
cement silicate paint, heat resistance, crack resistance, sodium hydrosilicate, sodium phosphate, microstructure, energy dispersive analysis.
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