Abstract

Restoration mortars for use in hystorical buildings should fullfill compatibility critera withrespect to the preexisting materials, in order to ensure harmlessness and effectiveness of therestoration solutions. Nevertheless, a satisfactory evaluation of the suitability of the mortarsfor restoration is quite difficult due to the lack of proper standards of reference for the specificneeds in the field of the Cultural Heritage, as well as for the lack of threshold parameters forthe evaluation of the compatibility with the preexisting materials. This paper describes thestudy for the set-up of an hydraulic mortar for restoration, specifically for masonry rendering.The mortar was designed for applications on soft and porous calcareous stones. The mix wasbased on natural hydraulic lime (NHL) added with metakaolin. Grinded dolomitic limestoneswere used as aggregate, and several admixtures with different functions were added. Theexperimental activity concerning the characterisation of the mortar was carried out on freshand hardened samples. The standard specifications for the renovation mortars, that meet somesuitable requirements for restoration, were assumed as reference parameters for the mortardesign and its qualification in terms of density, water vapour permeability, water absorptionby capillary action, flexural and compressive strengths. Attention was paid to the porosimetriccharacteristics, that were determined by Mercury Intrusion Porosimetry. The durability wasalso assessed by salt ageing test. The behavior of the mortar with respect to some soft andporous calcarenites was also concerned by the adhesive test on composite mortar/stonespecimens. Tests of evaporation of Na2SO4 saline solution were also performed on themortar/stone system, in order to assess the harmlessness of the mortar layers with respect tothe transport of the saline solution and to the effects of the salt crystallization at the interface.Finally, an overall evaluation of the performance of the mortar was traced on the basis of theresults of the analyses and tests.

Autore Pugliese

• Calia Angela

Tutti gli autori

• N. Bianco; A. Calia; G. Denotarpietro; P. Negro

Titolo volume/Rivista

Periodico di mineralogia

Anno di pubblicazione

2013

ISSN

2239-1002

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

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Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile