Proc. of the 6th Int. Seminar on Structural Analysis of Historical Constructions vol:2 pages:1053-1059
Structural Analysis of Historical Constructions edition:6 location:Bath date:2-4 July 2008
A geophysical resistivity measuring device was modified to perform automatic monitoring of historical masonry structures before, during and after grout injection for consolidation purposes. The obtained image is called a geo-electrical tomography. The technique was used to evaluate the deteriorated masonry of the recently partly collapsed Maagdentoren in Zichem, Belgium. The results of these measurements are dis-cussed. An important improvement is the adaptation of the “cross-borehole” measurement technique for ma-sonry. With this technique, a constant resolution in depth is achieved. Laboratory tests, using an adaptation of the “cross-borehole” technique, enabled to show the resistivity distribution changing during the injection of a test specimen with a hydraulic grout.