Abstract
Information provided about long-term bonding strength protective decorative coatings. A method is proposed for assessing the long- term bonding strength of coatings. The method consists in determining the bonding strength before testing and after t hours of testing. The dependence of the long-term bonding strength on the porosity of the cement substrate has been established. With an increase in the surface porosity of the substrate, observed a decrease in the time of maintaining the adhesive contact “coating-substrate». The aging process of coatings is considered from the position accumulation of damage, taking into account the hereditary factor. The influence of the hereditary factor on the kinetics of damage accumulation was established. It is shown that the dependence of the operating time on the level of damage accumulation can be approximated by an exponential dependence. The values of the activation energy of adhesive destruction of coatings are calculated.
Highlights
The operational durability of protective and decorative coatings of external walls of buildings is significantly influenced by the processes occurring both in the coating itself and at the “substrate-coating” contact boundary [1,2]
The adhesion strength of protective and decorative coatings to a concrete substrate substantially depends on the quality of the substrate
The presence of a weakened surface layer of the substrate creates the preconditions for a lower operational resistance of protective and decorative coatings [3,4,5,6]
Summary
The operational durability of protective and decorative coatings of external walls of buildings is significantly influenced by the processes occurring both in the coating itself and at the “substrate-coating” contact boundary [1,2]. The adhesion strength of protective and decorative coatings to a concrete substrate substantially depends on the quality of the substrate. The quality of the substrate, first of all, is understood as its macro- and microstructure, the degree of its homogeneity, ensuring the desired solidity of the contact layer, its density and porosity. The surface layer of the substrate has some differences from the base material. It is characterized by increased capillary porosity and a lower value of physical and mechanical properties. The presence of a weakened surface layer of the substrate creates the preconditions for a lower operational resistance of protective and decorative coatings [3,4,5,6]
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