Boron Distribution in Green Timbers Pre-treated with Boron Rods Followed by Creosote: 130 Week (2.5 year) Report

Mark E Mankowski; Craig Bell; G Kirker; Gerald Presley; Matthew J Konkler; James Renfroe; Jeffrey Morrell

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Boron Distribution in Green Timbers Pre-treated with Boron Rods Followed by Creosote: 130 Week (2.5 year) Report

Conference paper

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Boron Distribution in Green Timbers Pre-treated with Boron Rods Followed by Creosote: 130 Week (2.5 year) Report

Mark E Mankowski, Craig Bell, G Kirker, Gerald Presley, Matthew J Konkler, James Renfroe and Jeffrey Morrell

Proceedings of the 117th Annual Meeting of the American Wood Protection Association, pp.77-85

American Wood Protection Association (AWPA) Annual Meeting, 117th (Nashville, United States, 27-Jul-2021 - 29-Jul-2021)

American Wood Protection Association

2021

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Abstract

Borates

fused borate rod

passive diffusion

azomethine-H

Bridge timber

crosstie

creosote

high moisture content timber

red oak

white oak

Unseasoned (green) red and white oak bridge timbers and crossties were pre-treated with boron rods installed at equal distances along the length of the timbers. Moisture content and boron levels were examined at 15, 30, 50, 80, and 130 weeks after rod installation and subsequent treatment with creosote. Moisture content for both wood species remained high (above 50%) for the duration of the test period, well above the 30% moisture content needed for boron diffusion. Passive dual treatment with fused borate rods resulted in high boron loadings in both hardwood species, particularly in the longitudinal direction from rod installation points. Boron levels were lower in the outer tangential locations away from where rods were placed. Substantial longitudinal boron diffusion was observed for white oak, suggesting supplemental treatment of low permeability hardwoods may be possible using this preservative system.

Details

Title: Boron Distribution in Green Timbers Pre-treated with Boron Rods Followed by Creosote: 130 Week (2.5 year) Report
Authors: Mark E Mankowski (Author) - US Forest Service
Craig Bell (Author) - US Forest Service
G Kirker (Author) - US Forest Service
Gerald Presley (Author) - Oregon State University
Matthew J Konkler (Author) - Oregon State University
James Renfroe (Author) - Wood Care Systems (Kirkland, US)
Jeffrey Morrell (Author) - University of the Sunshine Coast, Queensland, National Centre for Timber Durability and Design Life
Publication details: Proceedings of the 117th Annual Meeting of the American Wood Protection Association, pp.77-85
Conference details: American Wood Protection Association (AWPA) Annual Meeting, 117th (Nashville, United States, 27-Jul-2021 - 29-Jul-2021)
Publisher: American Wood Protection Association
Date published: 2021
Organisation Unit: Forest Research Institute; National Centre for Timber Durability and Design Life
Language: English
Record Identifier: 99605108202621
Output Type: Conference paper

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