Ionitoring of water absorption in sedimentary rocks by X-raymputer tomography

摘要

A non-destructive technique, X-ray computer tomography (X-ray CT) has been used to visuale and quantify the water movement during water absorption tests, into two sedimentary rocks (La Marina andstone and a dolomitic rock, the Laspra Stone) used as building stones in some historical monuments in sturias (N of Spain). The 2-D images clearly show the water penetration inside the rocks along the time. The ater penetration rates in different zones of the samples, and in different time intervals, have been estimated sing the Hounsfield numbers provided by X-ray CT. A close relationship between the water penetration rate and the petrographic characteristics of the rocks has en found. The textural banding of the rock implies different water penetration rate in different directions. The nisotropic behaviour of this penetration rate has been also estimated.