Title: Moisture Monitoring in Concrete Bridges 1990-2011

Author(s): Torsten Lunabba, Hemming Paroll

Publication: NCR

Volume: 44

Issue: 3

Appears on pages(s): 25-44

Keywords: Moisture, monitoring, temperature, humidity, concrete bridge.

DOI:

Date: 12/15/2011

Abstract:
Several methods have been used for monitoring the moisture in concrete bridge structures, sampling, measuring the absolute humidity using gauges or optic fibres and measuring the relative humidity in concrete pores with resistive sensors. The capacitive sensors need stable conditions and are therefore not suitable for outdoor conditions. Optic fibres provide a reliable method to determine absolute humidity at a certain time for the entire bridge. Resistive sensors provide an efficient method for continuous monitoring. The relative humidity in concrete pores is strongly temperature dependent. Therefore, monitoring the relative humidity in concrete requires full understanding of the moisture – temperature equilibrium behaviour.