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SCALING - FLAKING
SCALING - FLAKING

Sample

Roman Wall of Tarraco. Tarragona (Spain). Portal de Sant Antoni.

Pathology Causes

Accumulation of salts due to repeated long crystallization cycles in porous materials (in this case pseudo-spherical crystal aggregates were formed).


Visual Image

Author: J.L.Prada
Description: Ashlars with salt pustules and  stone flaking. 

Image detail / macro

SCALING - FLAKING
Author: JL.Prada
Magnification: 20X
Description: Pseudo-spherical crystalline aggregates.

Microscope Image

SCALING - FLAKING
SCALING - FLAKING
Author: J.L.Prada
Magnification: Figure 1. x49. Figure 2. x556
Description: Figure 1. Pseudo-spherical crystalline aggregates with lenticular gypsum tablets.
Figure 2. Lenticular gypsum tablets with  other eolic particles.

Associated Pathologies

Alveolization.

Crumbling.

Blistering.


Other Tests

XEDS spectrum.

Observations

XEDS spectrum showing gypsum (S & Ca), calcite (Ca) and dolomite (Ca & Mg) crystals

Bibliography

PRADA. J.L. .Caracterización de Formas y Procesos de Alteración observados en Piedra de Construcción de Edad Miocénica del Área Monumental Romana de Tarragona".1995. PhD.
 
ARNOLD, A. & KUENG, A., (1985), Cristallization and Habits of Salt Efflorescences on Walls. Part I, Methods of Investigation and Habits. Vth hitemational Congress on Deterioration and Conservation of Stone. Lausanne. pp. 255-268.
 
ARNOLD, A. & ZEHNDER, K., (1985), Cristallization and Habits of Salt Efflorescences on Walls. Part.II ,Conditions of Cristallization. Vth International Congress on Deterioration and Conservation of Stone, Lausanne. pp. 269-277.
                                                                            


Author

Jose Luis Prada Pérez. prada43@wanadoo.es

Geologo


Institution or Company

ESCRBCC


Published Articles

ALVAREZ, A.;  ARGEMI, M.;  NAVARRO, A.; PRADA, J.L. & GOMÀ, F. 1993. Muralla romana de Tarragona. problemes de consolidació i conservació. XIV Congrés Internacional d'Arqueologia clàssica. Tarragona La ciutat en el món romà. Vol 2: Comunicacions. pp. 26-27.

    

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