Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Characterization of Old Mortars for the Formulation of Replacement Mortars
The exterior coatings of old buildings were mostly made with lime-based mortars. As coverings for the external facades of buildings, they are elements that are highly exposed to several actions such as climate actions, mechanical actions, etc., and therefore, they are the first ones to need conservation, rehabilitation or replacement interventions.
The conservation, rehabilitation or replacement of lime-based coatings are actions that involve the complicated task of choosing a new mortar that should not only be compatible with the existing mortar, but also compatible with the substrate itself.
There are two possible ways to properly choose the mortar to use, whether you choose to reproduce the old mortar, thus seeking to ensure its compatibility and its proper functioning, or you formulate a compatible mortar with an adequate behavior for the building in question, with an appearance that preserves the building's image.
In practice, the first way is impossible on its own as it is not yet possible to accurately determine the “evolution” of the mortar (dynamic processes in constant evolution – crystallization, dissolution and recrystallization, etc.) and it is also difficult to identify the technologies used in its execution and application and we are also unaware of the climatic conditions that may have influenced the curing process. The ideal will be a process involving the two mentioned ways.
For this, the first task should be to know the characteristics of the existing mortars and then select a similar mortar with an adequate behavior for the building.
What is presented in this work is a campaign carried out in order to choose replacement mortars for several old buildings located in the center of Portugal. For this, the existing mortars were characterized, suitable replacement mortars were selected and applied to the existing buildings. After they had been cured, an in situ experimental campaign was carried out in order to assess the suitability of the chosen mortars for the walls of the buildings.
Characterization of Old Mortars for the Formulation of Replacement Mortars
The exterior coatings of old buildings were mostly made with lime-based mortars. As coverings for the external facades of buildings, they are elements that are highly exposed to several actions such as climate actions, mechanical actions, etc., and therefore, they are the first ones to need conservation, rehabilitation or replacement interventions.
The conservation, rehabilitation or replacement of lime-based coatings are actions that involve the complicated task of choosing a new mortar that should not only be compatible with the existing mortar, but also compatible with the substrate itself.
There are two possible ways to properly choose the mortar to use, whether you choose to reproduce the old mortar, thus seeking to ensure its compatibility and its proper functioning, or you formulate a compatible mortar with an adequate behavior for the building in question, with an appearance that preserves the building's image.
In practice, the first way is impossible on its own as it is not yet possible to accurately determine the “evolution” of the mortar (dynamic processes in constant evolution – crystallization, dissolution and recrystallization, etc.) and it is also difficult to identify the technologies used in its execution and application and we are also unaware of the climatic conditions that may have influenced the curing process. The ideal will be a process involving the two mentioned ways.
For this, the first task should be to know the characteristics of the existing mortars and then select a similar mortar with an adequate behavior for the building.
What is presented in this work is a campaign carried out in order to choose replacement mortars for several old buildings located in the center of Portugal. For this, the existing mortars were characterized, suitable replacement mortars were selected and applied to the existing buildings. After they had been cured, an in situ experimental campaign was carried out in order to assess the suitability of the chosen mortars for the walls of the buildings.
Characterization of Old Mortars for the Formulation of Replacement Mortars
RILEM Bookseries
Bokan Bosiljkov, Violeta (Herausgeber:in) / Padovnik, Andreja (Herausgeber:in) / Turk, Tilen (Herausgeber:in) / Torres, Isabel (Autor:in) / Matias, Gina (Autor:in) / Pinho, Nilce (Autor:in)
Historic Mortars International Conference ; 2022 ; Ljubljana, Slovenia
Conservation and Restoration of Historic Mortars and Masonry Structures ; Kapitel: 8 ; 97-107
RILEM Bookseries ; 42
08.06.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Replacement Mortars in Conservation: an Overview
| British Library Conference Proceedings | 2004
| Engineering Index Backfile | 1887