Calibration and comparison of two moisture content measurement methods for in situ monitoring of beech laminated veneer lumber

Schiere, Marcus; Franke, Bettina; Franke, Steffen; Müller, Andreas (2021). Calibration and comparison of two moisture content measurement methods for in situ monitoring of beech laminated veneer lumber Wood Material Science & Engineering, pp. 1-12. Taylor & Francis https://doi.org/10.1080/17480272.2021.1958918

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A timber bridge constructed in 1815 was renovated in 2018, wherein the load-bearing system was reinforced with beech laminated veneer lumber (LVL) elements. Beech LVL is primarily found in dry and heated structures (Service Class 1). Although the material of this bridge would not be directly exposed to weather, it would be exposed to outdoor relative humidity ranging between 50% in spring and 90% or higher in autumn (Service Class 2). Thus, the moisture content development in the reinforcements was monitored to observe the response of the material under such conditions. The moisture content was measured using both sorptive and electrical resistance methods. The relationship between the electrical resistance of the material to moisture content and sorption isotherms was determined through laboratory experiments. Thereafter, the derived relationships were used to determine the moisture content measured on the bridge over a period of two years. Consequently, the two measurement methods resulted in overlapping of moisture content values, which remained within safe levels and are expected to be maintained in future. The overlapping moisture content measurements validated that either of the monitoring methods could be independently deployed to obtain reliable results.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Architecture, Wood and Civil Engineering School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture > Built Environment and Historic Preservation School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture > Timber Construction School of Architecture, Wood and Civil Engineering > Institute for Timber Construction, Structures and Architecture > Structural Engineering
Name:	Schiere, Marcus; Franke, Bettina0000-0002-8087-9347; Franke, Steffen0000-0003-2430-8491 and Müller, Andreas
Subjects:	T Technology > T Technology (General) T Technology > TG Bridge engineering T Technology > TH Building construction
ISSN:	1748-0272
Publisher:	Taylor & Francis
Language:	English
Submitter:	Bettina Franke
Date Deposited:	17 Jan 2022 14:30
Last Modified:	04 Nov 2022 09:38
Publisher DOI:	https://doi.org/10.1080/17480272.2021.1958918
Uncontrolled Keywords:	quality assurance timber bridge electrical resistance method sorption method beech LVL
ARBOR DOI:	10.24451/arbor.16179
URI:	https://arbor.bfh.ch/id/eprint/16179