The influence of the conditions of applying sealing polymer materials on the deformation resistance of the sealanter to sclofibro concrete

Abstract

The article deals with the features of the treatment of solid surfaces with a primer before using sealing materials. The adhesive strength of the sealant to the area of adhesion is the basis for sealing the joints. Lack of adhesion leads to the ingress of water, dirt, precipitation and other climatic effects, which eventually lead to the destruction of the seams. Therefore, it is extremely important to observe the seam treatment technology before applying the sealant. Proper treatment of seams with a primer, observing the time of application to the base, before using sealing materials will increase the durability and service lifespan of the sealed joint. To improve the adhesive strength between the adhesive and the substrate, as a rule, the hard surface (substrate) is pre-treated with a primer based on polyurethane foam or epoxy resins. These primers are used because when exposed to a hard surface, a polymer matrix is formed, which, upon further contact with the sealant, increases the adhesion strength in the contact zone. In surface defect zones with moisture content, a new surface layer is also formed due to the participation of polymer groups in forming intramolecular hydrogen bonds. The formation of a polymer layer on a solid surface containing defective zones requires a certain time. Tests were carried out to determine the resistance to deformations of a combination of sealant/primer sealing materials in combination with glass fiber reinforced concrete samples and to establish the influence of the conditions for applying a primer/sealant to the surface of a glass fiber reinforced concrete composition on resistance to a series of character cycles of equal loads and temperature changes, with a deformation of the sealing material of 25% . It has been established that the time of treatment of a solid surface with a primer should be at least 5 minutes. If this condition is not observed when sealing materials are applied to glass fiber reinforced concrete, it may cause the sealant to separate from the base.