Mineralization of heat-treated fir wood with magnesium oxychloride: mechanical properties

Abstract

With the rising demand for environmentally friendly construction materials in the building and construction industry, this study explores mineral-based compounds as a sustainable alternative to certain harmful chemicals. The focus of this research is to improve the mechanical properties of wood by utilizing magnesium oxychloride (MOC) as a mineral, aiming to minimize adverse environmental effects. The study investigates the mechanical characteristics of heat-treated and non-heat-treated fir wood post-mineralization with magnesium-based compounds. The samples were subjected to impregnation using the Bethel method, employing magnesium oxychloride through two distinct techniques: a combined treatment and a separate treatment. Subsequent to impregnation, the bending strength, modulus of elasticity (MOE), hardness, impact resistance, glue line shear strength (using polyurethane and polyvinyl acetate adhesives), and screw withdrawal resistance of the samples were assessed. The findings revealed an increase in density and enhancement in overall mechanical properties. Notably, the combined impregnation method yielded the highest values for bending strength, MOE, hardness, impact resistance, glue line shear strength, and screw withdrawal resistance in both treatments. The results for glue line shear strength demonstrated the highest value with polyurethane adhesive and the lowest with polyvinyl acetate adhesive. Furthermore, the outcomes from screw withdrawal resistance, in both perpendicular and parallel directions to the grain, showcased greater resistance in the perpendicular orientation for both treatments. These results suggest that the impregnation of heat-treated and non-heat-treated wood with magnesium compounds (oxide and chloride) effectively bolsters the mechanical properties.