Avaliação da perda de massa de madeiras de Pinus taeda submetidas a campo de apodrecimento em ambiente de floresta e a céu aberto

Abstract

The planting of exotic species has been increasing in recent years due to its rapid development and growth. Among these, we can highlight the use of the genus Pinus, exotic conifer commonly used in the furniture. Therefore, studies related to the physical and chemical properties of Pinus taeda wood become essential. As a result, the present work had as general objective to evaluate the mass loss of Pinus taeda wood submitted to a rotting field in two distinct environments (forest and open air). Test specimens with dimensions of 2.0 x 2.0 x 30 cm (thickness, width and length, respectively), were adapted to COPANT 30: 1-006. Before the implantation of the experiment, the material was evaluated for its physical properties, being it apparent mass, specific mass, shrinkability, coefficient of anisotropy and moisture content, thus evaluating the loss of mass of the material and the finish. Afterwards, they were implanted in open and forest rot fields, with 3 treatments of different finishes and 5 repetitions each, so that every 25 days their sanity was evaluated by means of specific mass loss tests. It was possible to conclude with this work that the apparent mass and specific mass found for the control was lower than for the materials with finishes, demonstrating the influence of this on the physical properties of the wood. In addition, the moisture content and retractability of the control was higher than that of the gypsum and primer materials, demonstrating the higher moisture absorption and dimensional instability of the evaluated specimen. The loss of mass was higher in the forest environment and in the control group, which could be explained by the physical analysis of the treatments, noting that the evaluated wood would not have an expected life when exposed to bad weather.