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Mechanical Stresses Generated by Crystallization of Salts Inside Treated and Non-Treated Monumental Stones; Monitoring and Interpretation by Acoustic Emission / Microseismic Activity.

Published online by Cambridge University Press:  28 February 2011

R.M. Esbert ,
M. Montoto ,
L. M. Suárez Del Río ,
V. G. Ruiz De Argandoña  and
C.M. Grossi
R.M. Esbert
Affiliation:
Dept. of Geology, Group of Petrophysics;University of Oviedo, 33080 Oviedo, Spain
M. Montoto
Affiliation:
Dept. of Geology, Group of Petrophysics;University of Oviedo, 33080 Oviedo, Spain
L. M. Suárez Del Río
Affiliation:
Dept. of Geology, Group of Petrophysics;University of Oviedo, 33080 Oviedo, Spain
V. G. Ruiz De Argandoña
Affiliation:
Dept. of Geology, Group of Petrophysics;University of Oviedo, 33080 Oviedo, Spain
C.M. Grossi
Affiliation:
Dept. of Geology, Group of Petrophysics;University of Oviedo, 33080 Oviedo, Spain
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Abstract

The crystallization of salts in building stones is one of the most common and severe deteriorating phenomencndeveloped on Historic Buildings. To evaluate their mechanical effects in treated and non-treated stones, experimental salt crystallization tests and the monitoring of the corresponding acoustic emission / microseismic activity, AE/MS, have been planned.

Salt crystallization tests have therefore been performed on a high porosity (30%) limestone used in the building of the Cathedral of Murcia (Spain). Each test consisted of 11 and 20 cycles (for the non-treated and treated specimens, respectively) of immersion of specimens in salt solution (14% Na2SO4. 10H2O) for 4 h., drying in an oven at 60 °C for 14 h. and final cooling at room temperature for 6 h. The treated specimens were consolidated by total immersion in ethyl silicate -Tegovakon V- and protected with a water repellent, oligomeric polysiloxane -Tegosivin HL- 100-, (both from Th. Goldschmidt, FRG).

The AE/MS, was monitored in the 100-300 KHz range. The preliminary results show a very different AE/MS behaviour between the non-treated and the treated specimens.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 185: Symposium G – Materials Issues in Art and Archaeology II , 1990 , 285
Copyright
Copyright © Materials Research Society 1990

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References

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