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Non-destructive methodologies for the evaluation of moisture content in sawn timber structures: ground-penetrating radar and ultrasound techniques

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Non-destructive methodologies for the evaluation of moisture content in sawn timber structures: ground-penetrating radar and ultrasound techniques

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dc.contributor.author Rodríguez-Abad, Isabel es_ES
dc.contributor.author Martínez Sala, Rosa María es_ES
dc.contributor.author García García, Francisco es_ES
dc.contributor.author Capuz Lladró, Rafael es_ES
dc.date.accessioned 2016-07-07T08:36:35Z
dc.date.available 2016-07-07T08:36:35Z
dc.date.issued 2010-08
dc.identifier.issn 1569-4445
dc.identifier.uri http://hdl.handle.net/10251/67296
dc.description.abstract The moisture content (MC) is a critical parameter for most physical and chemical pathologies of timber and, in the case of structural wood, a MC > 20% can be dangerous for any load-bearing construction. The complexity of evaluating MC while timber is in use by means of the current methods (oven-drying and resistance wood meter) led us to test non-destructive techniques to evaluate this parameter on site. With this in mind, measurements with two non-destructive techniques, ground-penetrating radar (GPR) and ultrasound, were carried out on joists of Pinus pinaster Ait. from their initial green state until the point of hygroscopic equilibrium moisture content. In particular, the analysis presented in this paper focuses on the capacity of each technique to register the velocity variations of their waves during the timber drying process. Prior to the GPR analysis, it was necessary to distinguish between differences in the propagation velocity of electromagnetic waves (vEM) attributable to the wood anisotropy and those due to variations in MC. The propagation velocity of the electromagnetic waves was always found to be lower when the electrical field was parallel to the grain of the wood than when it was perpendicular to it. However, when the field was perpendicular, its direction whether radial or tangential, did not significantly affect the vEM. The direct measurements illustrate the ability of the GPR technique to characterize the MC of timber as a clear decrease in the MC resulted in an increase in the vEM. A strong correlation was obtained between the two parameters with coefficients of determination, R2 > 90%. Longitudinal elastic wave velocities (vP) were assessed by means of a ultrasound technique during the timber drying process. Despite the fact that the vP increased with the decreasing MC of each joist, the determination coefficient between these two variables was very low. The analysis presented in this paper is a successful application of the GPR technique to the study of wood s physical properties and has a promising future for the non-destructive, on-site analysis of timber MC. es_ES
dc.description.sponsorship Financial support for this research was provided by the Spanish Ministry of Science and Innovation under the 2009-2012 national research and development plan through a project entitled: 'Integration of advanced and non-destructive evaluation techniques for structural timber and the restoration and conservation of heritage buildings (BIA2008-00342)'. We would like to thank our colleagues at the materials laboratory of the Escuela Tecnica Superior de Gestion de la Edificacion at the Universidad Politecnica de Valencia, Spain. The translation of this paper was funded by the Universidad Politecnica de Valencia. en_EN
dc.language Inglés es_ES
dc.publisher European Association of Geoscientists & Engineers es_ES
dc.relation Spanish Ministry of Science and Innovation BIA2008-00342 es_ES
dc.relation Universidad Politécnica de Valencia
dc.relation.ispartof Near Surface Geophysics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Moisture content es_ES
dc.subject Timber structures es_ES
dc.subject Ground-penetrating radar es_ES
dc.subject Ultrasound techniques es_ES
dc.subject.classification INGENIERIA CARTOGRAFICA, GEODESIA Y FOTOGRAMETRIA es_ES
dc.subject.classification CONSTRUCCIONES ARQUITECTONICAS es_ES
dc.subject.classification FISICA APLICADA es_ES
dc.title Non-destructive methodologies for the evaluation of moisture content in sawn timber structures: ground-penetrating radar and ultrasound techniques es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.3997/1873-0604.2010048
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Construcciones Arquitectónicas - Departament de Construccions Arquitectòniques es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Cartográfica Geodesia y Fotogrametría - Departament d'Enginyeria Cartogràfica, Geodèsia i Fotogrametria es_ES
dc.description.bibliographicCitation Rodríguez-Abad, I.; Martínez Sala, RM.; García García, F.; Capuz Lladró, R. (2010). Non-destructive methodologies for the evaluation of moisture content in sawn timber structures: ground-penetrating radar and ultrasound techniques. Near Surface Geophysics. 8(6):475-482. doi:10.3997/1873-0604.2010048 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.3997/1873-0604.2010048 es_ES
dc.description.upvformatpinicio 475 es_ES
dc.description.upvformatpfin 482 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 8 es_ES
dc.description.issue 6 es_ES
dc.relation.senia 291724 es_ES


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