Durability and protection of mass timber structures: A review

Emerging Engineered Wood for Building Applications

“…The reality, however, is that those adhesive bonding techniques, which would facilitate recycling, fail in providing the required (wet) stability and durability issues for structural applications still need to be overcome. CLT picture . Reproduced with permission from ref .…”

“…While wood modification and preservation treatments serve to improve durability and dimensional stability, − functionalization serves to enable wood with new properties, opening new fields of applications for wood. ,, A common feature is that chemical treatments are applied, resulting in often dramatic changes in the chemical composition of the treated wood. The most detrimental in terms of recyclability is the use of various biocide preservatives, whose importance for the durability of timber structures has been reviewed recently . Although health safety issues and environmental concerns have resulted in the prohibition of several chemical compounds and combinations, especially, for use in residential structures, wood impregnated with preservative materials still in use has to be treated as hazardous waste after its end of life.…”

“…The vast majority of wood-based products used in the construction sector are bound using synthetic adhesives (Figure ). − The development and implementation of materials such as glued laminated timber (glulam) and cross-laminated timber (CLT) would not have been possible without using tailored polycondensation (e.g., PRF) or polyaddition (PUR) adhesives, which can provide a strong and moisture-resistant long-term bond joint between wooden elements. , However, these properties, which are essential to obtain reliable structures are strong hinders against their efficient recycling. One reason is that the separation of the thermoset adhesives from wood after the end of life of a wood product is a very complicated and, in the current conditions, uneconomical process.…”

“…The most detrimental in terms of recyclability is the use of various biocide preservatives, whose importance for the durability of timber structures has been reviewed recently. 176 Although health safety issues and environmental concerns have resulted in the prohibition of several chemical compounds and combinations, especially, for use in residential structures, wood impregnated with preservative materials still in use has to be treated as hazardous waste after its end of life. Alternative approaches for wood protection try to prevent the degrading action of specific wood degrading fungi using natural fungi antagonists.…”

Análise da sustentabilidade, custo efetivo e resiliência das construções em madeira laminada colada e madeira laminada cruzada

“…No entanto a capacidade higroscópica e anisotrópica, pode limitar o uso em edifícios onde a altura da estrutura é um desafio a ser vencido. Recentemente encontra-se no mercado alternativas de madeiras engenheiradas, desenvolvidas especificamente para combater as limitações da madeira em seu estado natural, como a instabilidade dimensional, variabilidades e defeitos de crescimento (AYANLEYE et al, 2021).…”