PSI - Issue 59

Sviatoslav Homon et al. / Procedia Structural Integrity 59 (2024) 595–600 Sviatoslav Homon et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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enhancing the wood preservation effect, showed an increase in strength of 10-27%, compared to control samples at the standard moisture content of 12%. Due to the affinity of oils with wood fibers, it was possible to achieve the desired effect of rapid oil drying and increased compressive strength. Significant strength enhancement was achieved through the selected method of autoclave wood impregnation, performed by adjusting the temperature and pressure parameters, specifically: accelerator solution pressure - 1.0-2.0 MPa, vacuum exposure duration - 30 minutes, solution temperature - 60- 90 °C. After that, linseed oil was injected into the reservoir through a thin tube, and the wood was allowed to stand for an additional hour. The oil excess was removed from the wood surface at the end of the impregnation process. Preliminary research results (Table 3) indicated that the highest performance was achieved at a temperature of 90°C, while the lowest values were observed at 60 °C.

Table 3. Results of experimental studies on modified wood. Group Wood species

Temperature, 0 C

Impregnation pressure, MPa

f c , 0,d , MPa

1 2 3 4 5 6 7 8 9

Pine Pine Pine Pine Pine Pine Pine Pine Pine

1 1 1

60 75 90 60 75 90 60 75 90 60 75 90 60 75 90 60 75 90 60 75 90 60 75 90 60 75 90

48.2 53.2 53.1 49.8 55.1 57.6 51.1 50.9 55.6 50.2 51.4 50.7 53.0 54.2 55.7 51.2 51.9 53.6 46.2 49.4 51.5 50.3 49.8 54.7 51.1 52.1 53.9

1.5 1.5 1.5

2 2 2 1 1 1

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Birch Birch Birch Birch Birch Birch Birch Birch Birch

1.5 1.5 1.5

2 2 2 1 1 1

Spruce Spruce Spruce Spruce Spruce Spruce Spruce Spruce Spruce

1.5 1.5 1.5

2 2 2

In this context, the duration of exposure and excess pressure are of significant importance. With increasing pressure and temperature, there is an increase in strength. The analysis of experimental data has shown that an environmentally friendly method of deep modification of solid wood with non-toxic impregnating agents, namely a complex mixture of tar oil and boric acid (2%) along with linseed oil, interacts effectively with the wood structure (pores, fibers) at the structural level, leading to effective