EFFECT OF POROSITY OF CEMENT SUBSTRATE ON CRACK RESISTANCE OF PAINT COATINGS
To assess the crack resistance of paint coatings, we studied the stressed state of coatings from the action of temperature as one of the factors of coating aging. Several options were considered: pores filled and not filled with a paint composition, as well as the absence of pores in the contact zone. For each model, calculations were carried out and stress - strain patterns were obtained, according to which the analysis was carried out. The influence of the coating thickness on the stress state of the coatings was also evaluated. As considered heavy concrete. As a paint composition, polymer - lime and polyvinyl acetate - cement PVAC paints with different coefficients of linear thermal expansion were used. It has been established that with an increase in the coating thickness, an increase in the values of internal stresses is observed. Information is given on the stress state of paint coatings depending on the size of the pores in the «coating - substrate» contact zone. Recommendations are given to improve the crack resistance of coatings.