The aim of the research is to study the shear strength of laminated veneer lumber (LVL) when working on shear in four different planes. To determine the influence of the presence of technological cracks formed in the peeling process, an experiment was carried out for which four types of samples were used. The load was applied parallel and perpendicular to the glue line and the direction of the peeled veneer fibers. As tests have shown, the technological weakening of peeled veneer reduces the strength properties of a multilayer glued veneer bar, especially for shear along the glue lines and perpendicular to the direction of the peeled veneer fibers, where the maximum number of microcracks is located. The analysis of these microcracks is carried out and their widths are determined. The width of the studied cracks was from 152 to 94 μm. There is no adhesive layer in the microcracks of this building material, which may indicate insufficient wetting of the veneer surface with the adhesive material, or the difficulty of penetration of high-molecular phenol-formaldehyde glue into the cavity of microcracks.
The paper presents the results of the research on the use of eco-friendly impregnation materials to reduce cracking in load-bearing timber elements. The behavior of pine elements was studied when impregnation materials based on linseed oil were used. Statistical data are given on the reduction in the growth rate of the length and width of cracks, in dependence on the number of protective layers of the finishing material. The effect of the absence of cracks on timber elements during atmospheric drying is described, taking the use of a three-layer paint and varnish coating into account. The effect of increase of timber structures durability and corresponding cost and material consumption reduction in timber structures have been proven.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.