EFFICIENCY OF TRADITIONAL SHOU SUGI BAN WOOD PROTECTION TECHNIQUE IN ASSOCIATION WITH VEGETABLE OILS AGAINST ROTTING FUNGI ACTION ON PINUS WOOD

Abstract

The use of low-durability wood species encouraged the development of new methods focused on protecting wood from decay processes. Thus, the aim of the current study is to assess resistance-aggregation efficiency in Pinus sp. wood subjected to the action of fungi Trametes versicolor and Rhodonia placenta, as well as to the Japanese heat-treatment method called Shou sugi ban, in association with the incorporation of two oils. The experiment was performed based on the ASTM D – 2017 standard (1994). The herein adopted wood treatments comprised natural wood, charred wood, natural wood treated with linseed oil, charred wood treated with linseed oil, natural wood treated with Crude Tall Oil (CTO) and charred wood treated with CTO. There was resistance aggregation against the action of fungi T. versicolor and R. placenta in wood treated under all assessed conditions, although at different efficiency levels. Increased inhibition of xylophagous fungi action on charred Pinus sp. wood was observed when both linseed oil and CTO were incorporated to it. Based on the current findings, natural Pinus sp. wood is not resistant or perishable to these xylophages, but treated under the tested conditions were classified as resistant to T. versicolor and as moderately resistant to R. placenta.