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Resistance Measurements to Find High Moisture Content Inclusions Adapted for Large Timber Bridge Cross-Sections

https://research.thinkwood.com/en/permalink/catalogue2130
Year of Publication
2017
Topic
Moisture
Application
Bridges and Spans
Author
Björngrim, Niclas
Fjellström, Per-Anders
Hagman, Olle
Publisher
North Carolina State University
Year of Publication
2017
Format
Journal Article
Application
Bridges and Spans
Topic
Moisture
Keywords
Timber Construction
Moisture Content
Timber Bridge Monitoring
Wood Sensors
Research Status
Complete
Series
BioResources
Summary
One challenge of monitoring and inspecting timber bridges is the difficulty of measuring the moisture content anywhere other than close to the surface. Damage or design mistakes leading to water penetration might not be detected in time, leading to costly repairs. By placing electrodes between the glulam beams, the moisture content through the bridge deck can be measured. Due to the logarithmic decrease of the resistance in wood as a function of electrode length, the model must be calibrated for measurement depth. Two models were created: one for electrode lengths of 50 mm and one for electrode lengths up to 1355 mm. The model for short electrodes differed by no more than 1 percentage points compared with the oven dry specimens. The model for long electrodes differed up to 2 percentage points for lengths up to 905 mm, and over that it could differ up to 4 percentage points.
Online Access
Free
Resource Link
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