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Monitoring the moisture condition in a tunnel lining with help of MREs

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Author: Visser, J.H.M. · Polder, R.B. · Peelen, W.H.A.
Type:article
Date:2009
Institution: TNO Bouw en Ondergrond
Source:8th International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures, 30 September 2008 through 2 October 2008, Ise-Shima, 2, 1245-1250
Identifier: 428157
ISBN: 9780415485081 (
Keywords: Architecture and Building and Building

Abstract

A dummy segment from a bored tunnel with cast-in MREs was used to investigate if the moisture content of the concrete lining could be determined. The results were compared with two other in-situ resistivity measurements and correlated to the moisture content measured on cores drilled from the dummy and stored at various relative humidities. In addition, a capillary suction set-up was placed over the MREs and the capillary suction was measured, together with the changes in electrical resistivity. The results indicate that wetting front upon suction can be clearly seen. As a consequence, possibly leakages of (salty) water in the tunnel can be monitored well. On the other hand, the change in resistivity over longer periods of time, proved more difficult to interpret. Nevertheless, it is expected that the wetting front in the tunnel lining can be seen, so that an estimate of the maximum possible carbonation depth can be established.© 2009 Taylor & Francis Group.