The use of cement-based mortars for the repair of ancient masonry joints was quite common in the past and can account for a significant role in masonry decay, especially when highly porous building materials are present (bricks, sandstone, etc.). Mortar-induced degradation mechanisms in ancient masonry walls are quite complex and worthy of investigation, in order to properly assess the decay causes and to select suitable conservation strategies (removal, cleaning, substitution with compatible repair mortars, etc.). In the present paper, the case of the 17th century main portal of the Pio Palace in Carpi (Modena, Italy), where an outstanding differential decay between mortars and bricks is present, is discussed. Both bricks and mortars were characterized and the actual decay causes were detected, also in connection with the analysis of the environment surrounding the building and the historical evolution of the palace. The different microstructure of the original and repair materials was found to be responsible not only for different mechanical behaviour, but also for a different response to salt crystallisation, particularly intense in the palace due to the capillary rise of underground polluted water.

The role of mortars in ancient brick masonries’ decay: a study in the Pio Palace at Carpi (Italy)

FRANZONI, ELISA
2010

Abstract

The use of cement-based mortars for the repair of ancient masonry joints was quite common in the past and can account for a significant role in masonry decay, especially when highly porous building materials are present (bricks, sandstone, etc.). Mortar-induced degradation mechanisms in ancient masonry walls are quite complex and worthy of investigation, in order to properly assess the decay causes and to select suitable conservation strategies (removal, cleaning, substitution with compatible repair mortars, etc.). In the present paper, the case of the 17th century main portal of the Pio Palace in Carpi (Modena, Italy), where an outstanding differential decay between mortars and bricks is present, is discussed. Both bricks and mortars were characterized and the actual decay causes were detected, also in connection with the analysis of the environment surrounding the building and the historical evolution of the palace. The different microstructure of the original and repair materials was found to be responsible not only for different mechanical behaviour, but also for a different response to salt crystallisation, particularly intense in the palace due to the capillary rise of underground polluted water.
2nd Historic Mortars Conference HMC2010 and RILEM TC 203-RHM Final Workshop (RILEM Proceedigs PRO 78)
483
490
E. Franzoni
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/92790
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact