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On-site Monitoring of the Moisture Content of Bridge Decks Made of Nailed-Laminated Timber
The objective of this study was to understand the change in moisture content (MC) of bridge decks made of nailed-laminated timber (NLT), which is wildly used in New Brunswick, Canada. The ultimate goal is to develop a new type of timber deck system with longer service life. A MC monitoring system (Material Moisture Gigamodule for moisture meter, Thermofox Universal for temperature sensor) was adopted and stored outdoor in two newly-built bridges (Clark Mill Pond and Shikatehawk No.5) in New Brunswick to record the MC hourly. Meanwhile, the MC calibration tests were conducted using preservative-treated SPF lumber and saturated salt solutions in the laboratory with an aim at converting Electrical Resistance (ER) data recorded in MOhm to percentage by developing formulas. It was found that the MC values varied from 10.9% to 17.8% and 13.0% to 18.9% for Clark Mill Pond over 178 days and for Shikatehawk No.5 over 49 days, respectively. This suggests that the MC did not have a significant impact on the mechanical properties of the bridge decks tested during the monitoring period.