Abstract
Aim of study: To determine the effect on wood from Pinus sylvestris of treatment with preservatives on mechanical properties and to establish the relation between the penetration and compression strength.Area of study: SpainMaterial and Methods: 40 samples of defect-free wood from Pinus sylvestris L. were treated with Light Organic Solvent Preservative (Vacsol Azure WR 2601) and 50 with waterborne Copper Azole (Tanalith E 3492). 40 control samples were not treated (water or preservative). Mechanical resistance to static bending, modulus of elasticity and compression strength parallel to the grain were compared with untreated wood. Regression analysis between the penetration and compression strength parallel was done with the samples treated with waterborne preservative.Main results: The results indicate that the treated wood (with either product) presents a statistically significant increase in mechanical resistance in all three mechanical characteristics. The results obtained differ from earlier studies carried out by other authors.There was no correlation between parallel compression strength and the degree of impregnation of the wood with waterborne Copper Azole . The most probable explanation for these results concerns changes in pressure during treatment.The use of untreated control samples instead of samples treated only with water is more likely to produce significant results in the mechanical resistance studies.Research highlights: Treated wood presents a statistically significant increase in MOE, modulus of rupture to static bending and parallel compression strength.There was no correlation between parallel compression strength and the degree of impregnation with waterborne preservative.Keywords: Light Organic Solvent Preservative; MOE; parallel compression; static bending; waterborne Copper Azole; wood technology.
Highlights
The most widely used method of protection for wood against biodegradation consists of applying chemical substances
The results obtained for bending (MOR and modulus of elasticity to static bending (MOE) in Pinus sylvestris) differ from Yildiz et al (2004), who did not observe any significant differences between the control samples and the woods treated with Copper Azole (C-A) Tanalith E-3491
It should be noted that some of the results do not concur with the findings reported in Forest Products Laboratory 2010, as instead of detecting similar values for MOE and parallel compression in conjunction with the decreases in bending strength, all cases point to significant and considerable increases
Summary
The most widely used method of protection for wood against biodegradation consists of applying chemical substances. When using treated wood in structures, it is essential to be aware of the alterations that its mechanical characteristics can undergo as a result of this treatment. In most of the studies published, the influence of the treatment on mechanical strength was not significant. Treatments included alkaline copper quat (Barnes et al, 1993), waterborne copper naphthenate (Barnes et al, 2005), micronized copper quat and copper azole (Barnes et al, 2008) and copper xyligen in the study of MOR (Barnes et al, 2009). Winandy (1995) indicates that the mechanical strength of wood treated with oil-type preservatives is not altered Treatments included alkaline copper quat (Barnes et al, 1993), waterborne copper naphthenate (Barnes et al, 2005), micronized copper quat and copper azole (Barnes et al, 2008) and copper xyligen in the study of MOR (Barnes et al, 2009). Winandy (1995) indicates that the mechanical strength of wood treated with oil-type preservatives is not altered
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