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Information × Registration Number 0212U002636, 0109U002736 , R & D reports Title Development of physical-chemical bases of creation of ecologically safe anticorrosive composite coverings intended for protection of steel building construction popup.stage_title Head Kryvenko Pavlo, Registration Date 16-01-2012 Organization Scientific - research complex of the Kyiv National University of Construction & Architecture popup.description2 Physico-chemical basis of the low-temperature technology of composite coverings on geocement. With 3 factorial design to optimize the composition of the third order geocement type (0.25-0.3-0.35K2O +0.65-0.70-0.75 Na2O). Al2O3. (3,5-4-4,5) SiO2. (10,5-12 ,5-14, 5) H2O on the basis of sodium soluble glass. The basic physico-chemical laws geocement activation in the direction of a given composition and properties of tumors. It is shown that the introduction of alkali modifier (K2O) in the range of 3 to 4.5 moles improves spreadability geocement, adhesion to the metal surface and strength after heat treatment. Optimal molar ratios of the major structure-forming oxides SiO2/Al2O3 = 3,5 = 10.5 and N2O/Al2O3 and functional additives promote the formation of potassium hydromicas resistant to acidic environments in the pH range of 3 to 5. Activation of organic modifiers geocement enhances the viability and motility geocement suspension (GS). The introduction of organic modifiers: polyoxyethylene, polyoxyethylene mixture + Agocel S 2000, S 11 003 and 400 PFV Walocel MT in an amount of 0.2% by weight of the GS in the range from 0 to 60 min. provides stability indices tehnologically spreadability of the amplitude fluctuations within ± 1,5-5%. Physical activation of GS by means of dynamic cavitator allows obtain a homogeneous protective coverings with long pot life (up to 2 hours) and improved properties, which is 2.5 ... 3 times higher than in the prototype (analog), obtained by conventional equipment (mixer, autoclave , dissolver). It is shown that the most rational component activation geocement coverings for 5 ... 6 minutes at no more than 30 ° C, which in turn leads to improved performance properties of extended preservation coatings and their durability. The resulting rheological dependence GS describes the main provisions of the theories Shvedova, Biegman and theory of hydrodynamic explosion of non-Newtonian fluids. Investigated the stability geocement coverings under the action of aggressive media, represented by sulfate, phosphate and ammonium nitrate solution at concentrations from 0 to 5%. Marked resistance of coverings formulations developed under low salt concentrations from 0 to 2%, and high - 4 to 5%. The developed formulations geocement coverings are characterized by high resistance to frost (F150), weather- and salt resistance and resistance to UV radiation. It should be noted that geocement coverings the temperature range 20-300oC have similar values of linear thermal expansion coefficient of steel core, and some formulations are compatible with the values of linear thermal expansion coefficient of steel substrates in the temperature range 300-900oC. The present results are used to Skvirsky brick factory JSC "Promin" - drawing on the trolley drying protective coverings of the anode-protective effect, which is resistant to corrosive effects of wet kiln gases to Belotserkovsk private joint-stock company "ROSAVA" under the protection of industrial pipelines from the action of a humid atmosphere and Belotserkovsk Ltd. "Georesurs" - to protect process equipment from abrasive dust of kaolinite and atmospheric moisture. The practical value of the works in the development of physico-chemical technology for low power-consuming protective coverings on geocement by the method of sol-gel synthesis (nanolevel) using dynamic cavitators and development "Recommendations on the use and application of coverings to protect geocement of metal construction, which are operated in wet gas environments ". Product Description popup.authors Білан Ярослав Валерійович Бондаренко Сергій Васильович Гузій Сергій Григорович Кавалерова Олена Сергіївна Киричок Володимир Іванович Кравченко Анастасія Володимирівна Кривенко Павло Васильович Майстренко Ала Володимирівна Низовцева Ольга Ігорівна Петропавловський Олег Миколайович Ростовська Галина Степанівна Семенов Володимир Максимович Чеховський Олександр Володимирович popup.nrat_date 2020-04-02 Close