Mechanical Properties and Strength Reliability of Impregnated Wood after High Temperature Conditions

Abstract

The paper presents the results of the research into the impact of impregnation of wood on its bending strength and elastic modulus under normal conditions and after thermal treatment and investigates its structural reliability. Pinewood, non-impregnated and pressure impregnated with a solution with SiO2 nanoparticles, was used in this research. The use of nanoparticles decreases the flammability of timber among others. Some of the tested samples were treated at 250 °C. This temperature corresponds to the boundary of the self-ignition of wood. This elevated temperature was assumed to be reached by a given speed of heating within 10 min, and then the samples were stored in these conditions for 10 and 20 min. The tests demonstrate that the bending strength of the impregnated wood was slightly improved, the impregnation did not impact the elastic modulus of the material in all such conditions, and the residual strength decreased less for the wood impregnated after being exposed to the elevated temperatures. The reliability analysis proves a positive effect of impregnation with a solution with SiO2 on the durability of wood, both after being exposed to normal and elevated temperatures. The distribution of the failure rates indicates a more intensive degradation of non-impregnated wood. The distribution of the survival function demonstrates a more probable non-destruction of impregnated wood after elevated temperature conditions.

Wood Preservation Practices and Future Outlook: Perspectives of Experts from Finland

“…The findings of this paper regarding the future of pressure-impregnated wood and modified wood, highly processed surface treatment products, bio-based binders, environmentally friendly methods of wood preservation, and fire protection strategies confirmed some of the findings reported in other studies, such as [64][65][66][67][68].…”

“…In the interviews, expert responses indicated that pressure-impregnated wood will continuously develop and secure its market in the future in Finland. Many innovative studies (e.g., [64,69]) on this subject in the literature support this finding. Additionally, expert opinions emphasized that the new wood preservation methods introduced are not economical and require long-term research and testing.…”

Ecological Wood Protection System against Fire, Fungi and Insect Damage Using Humic Acids and Fly Ash

“…In addition to adhering to the International Building Code [5] and relevant national regulations, enhancing the fire resistance of construction materials is imperative. Thus, mitigating the fire hazard associated with wooden structures emerges as a primary obstacle to expanding timber's utilization in construction [6]. During fires, timber structures experience diminished loadbearing capacity compared with non-combustible materials such as steel, accompanied by decohesion attributable to carbonization and the thermal breakdown of biopolymers including cellulose, hemicellulose, and lignin.…”

Adhesive Bonding of Scots Pine Wood from the Szczecinek Forest District for the Production of Garden Equipment: An Experimental Investigation

“…The protection of functional wood, particularly that coming into direct contact with water or soil, is largely based on introducing protection agents with powerful, conserving, fungicidal properties. The range of such products is constantly being expanded with the introduction of new generations of active substances, which are currently being developed with regard to eco-safety requirements [1][2][3][4][5]. Generally speaking, wood impregnation processes are carried out by surface methods (lubrication, spraying and immersion) or vacuum pressure methods.…”