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Evaluation in Situ of the State of Deterioration of Monumental Stones by Non-Destructive Ultrasonic Techniques.

Published online by Cambridge University Press:  28 February 2011

M. Montoto ,
L. Calleja ,
B. Perez  and
R.M. Esbert
M. Montoto
Affiliation:
Dept. of Geology, Group of Petrophysics; University of Oviedo. 33080 Oviedo, Spain
L. Calleja
Affiliation:
Dept. of Geology, Group of Petrophysics; University of Oviedo. 33080 Oviedo, Spain
B. Perez
Affiliation:
Dept. of Geology, Group of Petrophysics; University of Oviedo. 33080 Oviedo, Spain
R.M. Esbert
Affiliation:
Dept. of Geology, Group of Petrophysics; University of Oviedo. 33080 Oviedo, Spain
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Abstract

A non-destructive ultrasonic procedure has been developed for evaluating in-situ the relative deterioration of monumental stones. Ultrasonic waves are injected into the rock and they are registered, processed and petrophysically interpreted after travelling through it. The procedure applied to a Spanish Monastery (San Lorenzo de El Escorial, Madrid) built with a granitic rock is described.

The following methodology was applied: in-situ categorization of the observable deterioration forms, sampling in the original quarries, laboratory ageing tests and continuous ultrasonic monitoring, in-situ data acquisition, evaluation of the ultrasonic parameters by signal processing and stepwise discriminant analysis. All that information is petrophysically interpreted for an appropriate assignation of the in-situ studied masonry blocks to the categorized deterioration degrees.

Final in-situ results from the Monastery of El Escorial are here presented. Among the studied ultrasonic parameters energy is the most useful of all of them and velocity the least.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 185: Symposium G – Materials Issues in Art and Archaeology II , 1990 , 273
Copyright
Copyright © Materials Research Society 1990

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References

[1] Colegio Oficial de Arquitectos de Madrid. (1986): El Escorial: la arcruitectura del monasterio. Bustos, Carlos (Ed.), Madrid.Google Scholar
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