Effect of post-heat treatment on fire retardant treated wood properties

Ozkan O. E., TEMİZ A., Tor O., Vurdu H.

HOLZFORSCHUNG, vol.76, no.7, pp.645-657, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 76 Issue: 7
  • Publication Date: 2022
  • Doi Number: 10.1515/hf-2021-0235
  • Journal Name: HOLZFORSCHUNG
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Agricultural & Environmental Science Database, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Veterinary Science Database, Civil Engineering Abstracts
  • Page Numbers: pp.645-657
  • Keywords: Anatolian black pine, di-ammonium phosphate, glucose, leaching resistance, TGA, DIMENSIONAL STABILITY, MECHANICAL-PROPERTIES, THERMAL-TREATMENT, STRENGTH, COLOR, PHOSPHATE, HYGROSCOPICITY, WETTABILITY, DURABILITY, BEHAVIOR
  • Karadeniz Technical University Affiliated: Yes

Abstract

In this study, Anatolian black pine (Pinus nigra subsp. pallasiana) was treated with fire retardants of 10, 20, and 30% aqueous solutions composed of di-ammonium phosphate (DAP), borax, boric acid, and glucose to determine the effectiveness of these chemicals in preventing the spread of fire. The treated wood was subjected to post-heat treatment at 120, 150, and 180 degrees C for 1 h to examine the effects of the post-heat treatment on pH changes, anti-swelling efficiency, water absorption, mechanical strength, accelerated weathering, leaching resistance, thermogravimetric analysis (TGA), UL-94 vertical burning test and crystallinity index. The post-heat treatment of fire-retardant treated wood reduced water intake and increased dimensional stability, while also improving mechanical and thermal properties in general. DAP/glucose complexes promote phosphorus fixation in wood and reduce leaching, resulting in long-term fire protection of wood in service. Because of these improvements in the post-heat treated wood by impregnated fire retardant, it can potentially be used as a reliable engineering material in a wide range of structural applications.