Abstract
To evaluate in-situ the relative deterioration of monumental stones, a non-destructive ultrasonic procedure is under development: ultrasonic waves are introduced into the rock and after travelling through it are processed for evaluation of their Vp, amplitude, duration, energy and count number. The procedure was applied to two Spanish Monasteries, one built with a granodiorite (El Escorial, Madrid, which results are included here) and the other built with sandstone (Sta. Maria de Ripoll, Gerona). Laboratory ageing tests, involving monitoring of the above mentioned ultrasonic parameters, were performed as a basis for interpreting the in-situ measurements. The energy seems to be the most sensitive parameter as an indicator of the rock deterioration, so, the value obtained for a masonry block in the monument can be used to classify the rock into one of preset deterioration groups.
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