Abstract
The greatest interest of researchers is focused on the processes of heat treatment of wood, taking place in an airless environment at temperatures of 180-250 °C, since heat treatment of wood allows increasing its moisture resistance, reduce hygroscopicity, and increase resistance to decay. However, a decrease in the hygroscopicity of wood adversely affects the process of obtaining glued materials due to a decrease in the wettability of thermowood surface and, as a consequence, a decrease in adhesion characteristics. This work is devoted to the study of the effect of ozone on the surface of thermally modified wood to increase the adhesive properties during gluing. It has been determined that the ozonation contributes to an increase in the wettability of the surface layer of thermal wood by more than 15% due to the reactivity of ozone to oxidize and degrade ligno-containing products of wood. It was revealed that the modification of wood, including preliminary volumetric heat treatment followed by surface treatment with ozone, causes an increase in the strength of the glue line when operated in high humidity conditions. In connection with the results obtained, an improved technology for the production of glued load-bearing structures for wooden housing construction is proposed.
Highlights
IntroductionThe foreground is that wood is a durable, lightweight, and environmentally friendly renewable source of raw materials with minimal energy consumption for the manufacture of glued construction materials and products
The use of wood in construction is due to many factors and has a long history
The results of studies to determine the adhesion strength of mineral binders to the surfaces of wood of various species before and after heat treatment indicate that heat treatment does not affect adhesion, but often reduces it, which can be explained by deterioration in the wettability of thermowood
Summary
The foreground is that wood is a durable, lightweight, and environmentally friendly renewable source of raw materials with minimal energy consumption for the manufacture of glued construction materials and products. Chemical methods of biological material processing (acetylation, impregnation, and soaking) are known, where the modification is carried out with various chemical solutions, which are aimed at improving the specific properties of raw materials depending on the required final parameters of the finished product. In most cases chemical methods for processing wood filler involve complex technological processes that require multi-stage processing of the material, high capital and operating costs. In this regard, there is a growing interest in improving the quality of sawn timber using heat treatment. The main differences between technologies are the environment in which the heat treatment process is carried out: water vapor, oil, inert environment, and vacuum
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