Peculiarities and problems of determination of the predicted durability term of steel constructions coatings

The subject of predicted durability term of steel constructions coatings using accelerated tests and experimental determination of steel constructions coatings fire-resistance after weather testings is raised in the article. The benefits and drawbacks of steel constructions in present-day building industry and construction design are introduced. The factors influencing steel constructions fire resistance increase are presented. The article shows that the most advanced and ideal for the protection of steel constructions is using the agents that expand and blow up under the temperature influence, forming thus a porous structure on the surface to be protected. The stages to receive the necessary indexes of predicted durability term of steel constructions coatings as well as methods to carry out climate tests both in the heated and unheated premises are described. For experimental determination of steel constructions coatings fire resistance it is suggested to use the method based on the experimental determination of the temperature of a steel plate with fire-resistant coating in the conditions of high temperatures typical of a fire, and on the solution of inverse and direct tasks of heat conduction for determination of thermal and physical characteristics of fire-resistant coatings and dependence of minimum coating thickness on the thickness of the steel plate, durability of fire impact and the steel critical temperature value. It is concluded that there is the necessity to develop the methodological support that makes it possible to estimate the coatings fire-resistance after or in the process of carrying out the accelerated climate tests as compared to the control examples. The list of problems that come into being while determining the steel constructions coatings fire-resistance after the climate tests is distinguished as well as the purpose of the future researches and tasks that should be solved