Abstract
The effect of the thickness of the glue line on the bond strength of construction materials is examined and the dependence of the optimal thickness of the glue line on surface roughness and glue viscosity is shown. The effect of surface roughness on strength and durability of adhesive joints is explained on the basis of a molecular mechanism of interaction of the glue with the surface roughnesses and an approximate expression is derived for the depth of penetration of the glue into microcavities of the surface as a function of the geometric parameters of the microcavities, specific pressure, and surface tension of the interface with the air.
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