Search academic texts

Registration Number

0214U000373, 0112U001478 , R & D reports

Title

Physico-chemical basis for the creation of environmentally friendly fire-retardant coatings geocement to protect wooden structures

popup.stage_title

Head

Kryvenko Pavlo,

Registration Date

25-02-2014

Organization

Kiev National University of bildiny and tecture

popup.description2

With the help of physical - chemical methods of research identified the mechanism of effect modifiers on the processes of structure and properties of artificial stone composition based geocement Na2O • Al2O3 • 6SiO2 • 20H2O in terms of variables of temperature fields . Modified geotsementnoi organic dispersion ( latex acrylate - 0,5%, urea - 8% carboxymethylcellulose and 2% ) and inorganic ( trisodium phosphate - 3.5% ) additives in the range of from 0 to 60 min. leads to a stable process performance (0.350 m) and kinematic ( 52.34 cSt) viscosity and strength of the plastic (82 Pa). In the early stages strukturoutvorenya found that urea and additives carboxyl methyl cellulose in the range of 70 and 130 minutes , respectively , 60 - 250 minutes slow the development of structure in the direction of the space coagulation structure ( amplitude values fall frequency characteristics ) , and the addition of trisodium phosphate , from 180 minutes intensifies the process of structure formation in the direction of condensation - crystal structure , as evidenced by increasing values of the amplitude - frequency characteristics of the binder system. Determined that the adhesive characteristics depend on the physical and mechanical properties and wood . Adhesive peel strength (1,58 - 2,63 MPa) increases in the series : oak beech maple spruce pine alder , and adhesion at a cut (1,8 - 7,83 MPa) decreases in the series : alder maple oak pine spruce beech . It is shown that the bulk hydrophobization geotsementu silicones vilugovanist and reduces its pH gradient distribution of the alkaline medium from the maximum values at the center ( pH = 8.86 ) to a minimum at the surface (pH = 8.13 ) , which results in low values of the hydraulic and poniknosti reduce alkali corrosion attack on the cellulose fibers and lignin, wood substrate. Phase transition from hydrated compounds in anhydrous geotsementu in the temperature range 423 - 1323 K is due to the dehydration of zeolite phases and phase transitions in anhydrous alkaline aluminosilicates in the following order : dehydration and usingitu heulandite ( 423 K ) hydromicas crystallization and polymorphic transition covered in dickite ( 573 K ) polymorphic transition in nacrite dickite , dehydrated sodium zeolite and kaolinite ( 723 K ) dehydration of kaolin and education quartz ( 873 K ) complete dehydration of kaolinite and covered with subsequent transition to the ? ? nepheline, polymorphic transformation - SiO2 in - SiO2 ( 1023 K ) complete dehydration of zeolite phases beginning crystallization kyanite and albite , polymorphic transformation - SiO2 in - tridymite ( 1173 K ) education vitreous , complete dehydration hydromicas ( paragonite and pyrophyllite ) , crystallization of jadeite ( 1323 K ) . Based on the above phase transitions modeled formation pore structure geocement coverage in the temperature range 423 - 1323 K. With the help of mathematical processing of the experimental results is optimized insulation coating composition based on modified geotsementu composition Na2O • Al2O3 • 6SiO2 • 20H2O: geoсement - 67 % perlite - 25 % limestone - 8% with the following characteristics : viscosity technological 0,166 ... 0.188 m , adhesion 2,3 ... 2.4 MPa. Dimensional model based on the mathematical modeling of thermal processes occurring in the system " lining - geocement material" and defined the minimum coating thickness ? 0,0045 m , which ensures minimum speed flammability of wood 2,36 - 2,98 kg / s m2 value at 2.8 ... 3.53 times less than the values of unprotected wood. Results of fire tests (temperature flue gas poshkodzhennosti coating length and weight ) indicate that the developed flame retardant heat-insulating coating has a group I fireproof efficiency , reduces the rate of charring working section and increases the fire resistance of wooden structures almost tripled .

Product Description

popup.authors

Бондаренко Сергій Васильович
Гузій Сергій Григорович
Дмитренко Олег
Заборовець Богдан
Киричок Володимир Іванович
Кравченко Анастасія Володимирівна
Кривенко Павло Васильович
Манак Ян

popup.nrat_date

2020-04-02