Abstract
Timber buildings are experiencing a rapid diffusion due to their good performance and their sustainability; however, some steps of structural timber production process, such as drying, are energy-intensive and environmentally impactful, and many wood species are also affected by low yield. Therefore, it would be important to determine the quality of the green material, that is, in wet condition, before undergoing the most impactful and expensive production steps. This paper describes a research aimed at quantifying the variation of the dynamic modulus of elasticity MoEdyn, which is commonly used for structural timber mechanical grading, from wet to dry condition in Sardinian maritime pine boards to be used for the production of laminated timber, and to examine the relationship between wet and dry MoEdyn. The MoEdyn was determined from measurements of the velocity of sonic waves propagating through the boards. The results show that the dry MoEdyn can be estimated starting from boards sonic testing in the wet condition, so providing a basis for implementing Sardinian maritime pine pre-grading in order to obtain the reduction of manufacturing costs, the abatement of environmental impact, and the increase of structural grade yield.
Highlights
Timber is generally acknowledged as one of the most effective building materials in terms of environmental sustainability because of its inherent eco-compatibility, mechanical and building physic performance, and ease to install [1,2,3]
An experimental investigation aimed at investigating the relationship between wet and dry dynamic modulus of elasticity MoEdyn in Sardinian maritime pine has been carried
MoEdyn of Sardinian maritime pine boards both in the wet and dry conditions has been determined from measurements of the velocity of sonic waves propagating from one end of the boards to the other
Summary
Timber is generally acknowledged as one of the most effective building materials in terms of environmental sustainability because of its inherent eco-compatibility, mechanical and building physic performance, and ease to install [1,2,3]. The production of boards for laminated timber is affected by percentages of rejects that can be very high, which, depending on the wood species, can lead to low yields that affect the sustainability of the production These aspects of the manufacturing process lead to the opportunity of carrying out a pre-grading of the material still in the wet condition, in order to bring to drying only the material suitable for structural uses and to reduce production costs related to low yields at the same time. Sardinian maritime pine is a wood species very common in Sardinia, currently under study as regards its possible structural use as glue-laminated timber (GLT) and crosslaminated timber (CLT) It is generally characterized by medium-low quality due to the presence of defects (knots, clusters of knots, resin pockets, grain deviation, etc.). TThheeexexppeerirmimeenntatal lstsutuddyyddesecsrcirbibededininththeepprerseesnent tppapapererwwasascacrarrireidedoouut tonon9191boboaradrds s oof fSSaradrdininiainanmmarairtiitmimeeppininee(F(Figiugurere1)1w) whohsoeseavaevreargaegeddimimenesnisoinosnsaraerererpeoprotretdedininTaTbalbel1e.1
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
