A proposed standardization framework for recovered timber strength grading

Llana, Daniel F.; Ridley-Ellis, Daniel; Turk, Goran; Íñiguez-González, Guillermo

Abstract

An increasing quantity of wood is recovered from demolitions, presenting opportunities for enhanced value through reusing or recycling in structural uses. Prior to utilizing timber for structural applications, it is essential to subject it to a grading process. The recovered timber often falls short of meeting the standard requirements for new timber grading define in the standards EN 14081, especially timber source identification. Even if it manages to meet these standards, the rejection rate is likely to be quite high. A new standardize framework different than the current new timber framework is needed for recovered timber grading. The present work explains the issues taking into account for that standard proposal, like combine machine grading and visual parameters, avoid defining new strength classes for recovered timber using instead a resistance profile of 3 or 4 properties code and visual override aspects not detected for machine and mainly from carpentry joints origin. Furthermore, some features not related with timber mechanical properties as nails, dimensions, etc. but affecting reusability possibilities are discussed.

Citation

Llana, D. F., Ridley-Ellis, D., Turk, G., & Íñiguez-González, G. (2024, June). A proposed standardization framework for recovered timber strength grading. Presented at III Congreso Ibero-Latinoamericano MAD de la Madera en la Construcción (CIMAD 24) : Libro de Actas de Resúmenes Extendidos, Madrid

• Presentation Conference Type: Conference Paper (published)
• Conference Name: III Congreso Ibero-Latinoamericano MAD de la Madera en la Construcción (CIMAD 24) : Libro de Actas de Resúmenes Extendidos
• Start Date: Jun 10, 2024
• End Date: Jun 14, 2024
• Acceptance Date: Jun 10, 2024
• Online Publication Date: Jun 26, 2024
• Publication Date: 2024-06
• Deposit Date: Oct 16, 2024
• Peer Reviewed: Not Peer Reviewed
• Article Number: 1159
• Pages: 621-625
• Book Title: Libro de Actas de Resúmenes Extendidos
• DOI: https://doi.org/10.20868/UPM.book.83748
• Keywords: Circular Economy, Non-destructive testing, Reclaimed, Reuse, Salvaged, Secondary timber
• Related Public URLs: https://www2.montes.upm.es/CIMAD2024/