INFLUENCE OF COMMERCIAL THERMAL TREATMENT ON Eucalyptus grandis Hill ex Maiden WOOD PROPERTIES

Abstract

This study aimed to evaluate the influence of commercial thermal treatment on Eucalyptus grandis considering its physical, chemical, and mechanical properties. The wood samples were heat-treated in an autoclave with saturated steam and pressure application at four different temperatures: 155, 165, 175, and 185 ºC. The physical, chemical, and mechanical properties were altered due to the heat treatment. The extractives content varied between 6.06% and 28.75%; lignin between 28.93% and 37.96%; holocellulose between 65.01% and 38.12%. The mechanical properties reduced significantly with the increase of the heat treatment temperature. Through the set of data obtained, it was possible to generate significant and high precision regression models capable of estimating such properties for heat treatment temperatures not studied experimentally, enabling the determination of the most suitable temperature of heat treatment to achieve a certain property value of the treated wood.

Determination of the Elastic Modulus of Brazilian Tropical Wood at High Temperatures Using the Impulse Excitation Technique (IET)

“…In the Brazilian context, where vast expanses of tropical forests sustain a robust forestry industry, wood continues to play an essential role in architecture and civil engineering [Batista et al 2023;Araújo et al 2021]. However, the mechanical response of wood under extreme conditions, such as high temperatures, is an aspect that has received relatively limited attention compared to its widespread use [Calonego et al 2020;Lengowski et al 2020;Bandera et al 2021;Oliveira et al 2021].…”