PSI - Issue 81

Oleksandr Matviiuk et al. / Procedia Structural Integrity 81 (2026) 493–498

496

3. Results and discussion Based on the conducted experiments, the main strength and deformability characteristics of spruce and ash wood were determined under short-term axial compression along the grain in various conditions: at standard moisture content (12%); after 28 days of water immersion; modified with the polymer composition Silor; and modified with Silor followed by water immersion for 28 and 180 days, respectively. From the experimental results, deformation diagrams of composite material prisms based on Silor polymer composition and spruce and ash wood were constructed after 180 days of water immersion (Fig. 3).

Fig. 3. Deformation diagrams of Silor-modified structural spruce and ash wood during exposure to water for 180 days.

Experimentally, the following mechanical parameters were determined: ultimate compressive strength, critical and residual strains, and modulus of elasticity (Table 2). All values are presented as averages.

Table 2. Results of experimental researchs Wood species Immersion time, days

u c,0,d, mm/mm u c,u , mm/mm u c,fin , mm/mm

f c,0,d , МPа

E 0 , МPа

At moisture content of 12%

Spruce

- -

38.9 49.4

13800 15400

0.00435 0.00581

0.00639 0.00953

0.3057 0.4084

Ash

Water-impregnated specimens (moisture content > 30%)

Spruce

28 28

20.4 28.7

11000 13600

0.00513 0.00668

0.00713 0.01035

0.3721 0.4967

Ash

Specimens modified with Silor polymer composition

Spruce

- -

50.8 62.2

21900 23200

0.00360 0.00505

0.00533 0.00732

0.2699 0.3743

Ash

Silor-modified specimens immersed in water

Spruce

180 180

50.1 61.6

21900 23100

0.00362 0.00508

0.00533 0.00735

0.2687 0.3735

Ash