Cleaning of stone materials in the Cathedral de Valladolid (Spain)


  • R. Fort Instituto de Geología Económica (CSIC-UCMF)
  • M. C. López de Azcona Instituto de Geología Económica (CSIC-UCMF)
  • F. Mingarro Instituto de Geología Económica (CSIC-UCMF)



cleaning methods, limestones petrophysics, chromatic parameters, monuments conservation, architectural heritage


Two types of black crusts showing gypsiferous and calcareous compositions are recognized on the front-walls of the Valladolid Cathedral. On the basis of several petrophysical parameters, in particular compacity, sorption and desorption kinematics of carbonate rocks used building the cathedral, we conclude that the most appropriate cleaning method of the ashlars is washing with water. Highest efficiency of the method is attained with water at 90ºC and at a pressure of 120 bars. This assessment is valid for most of the carbonate rocks of the cathedral except for detrital pelmicrites because of their low compacity which makes that water pressure for cleaning must not exceed 50 bars. The processing of cleaning with water should be preceded by alkaline treatment (NaOH and EDTA) of the rock surface.


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How to Cite

Fort, R., López de Azcona, M. C., & Mingarro, F. (2000). Cleaning of stone materials in the Cathedral de Valladolid (Spain). Materiales De Construcción, 50(258), 37–50.



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