Materiales de Construcción, Vol 52, No 267 (2002)

The lime renderings from plaza de la Corredera, Córdoba


https://doi.org/10.3989/mc.2002.v52.i267.323

T. González Limón
Laboratorio Central de Estructuras y Materiales. Centro de Estudios y Experimentación de Obras Públicas (CEDEX). Ministerio de Fomento, Spain

M. Álvarez de Buergo Ballester
Instituto de Geología Económica (CSIC-UCM), Spain

Abstract


The causes of the pathologies found on the lime renderings from Plaza de la Corredera façades are analysed in this study. For this purpose, the mineralogical and chemical analyses of the building materials -brickwork and rendering mortar- has been carried out, as well as their physical, hydric and mechanical properties have been determined. The obtained results from both unaltered and altered materials, and the analysis of the rendering's raw materials, have allowed us to establish that rendering deterioration is connected to the presence of saline compounds (gypsum, halite), which existing in the brickwork substratum, have been removed due to the water saturation of such brickwork.
The main cause responsible of the alteration forms - efflorescence, crusts, grain-disintegration, bulging, flaking found on the renderings, has been the salts precipitation (halite, hexahydrite, epsomite) in their way towards the external surface.

Keywords


mortar; rendering; lime; brickwork; alteration

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