Grouting mortars for consolidation of historical renders showing loss of adhesion

Abstract eng:
Loss of adhesion is one of the main forms of degradation of old renders; it can cause the separation of different render layers or the separation of the render and substrate; this in turn can produce anomalies such as de-bonding, detachment, cracks and lacuna on the render. The work represented here is part of a study developed at the LNEC – National Laboratory of Civil Engineering of Portugal – to examine how consolidation using grouts for adhesion restitution can be used for the restoration of historical renders. The lime grouts used for consolidation should be mechanically, physically and chemically compatible with the original render, as this is a practically irreversible treatment. The aim of this study is to examine the characteristics of grouts, with consideration to their compatibility and efficacy. This paper details the methodology of the study and a description of the laboratory tests carried out, as well as a critical analysis of the results and a summary of the conclusions. Some proposals for future research are also presented.

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