Brick masonry constitutes an important part of the construction materials found in historic buildings in Veneto (north-eastern Italy). Their production started in the Roman Times, exploiting the locally avail-able clay materials forming the vast Padan plain valley. Selection of different quarrying areas, changes in the production recipes and in firing techniques determined the production of bricks characterized by different physical-mechanical properties, particularly with respect to the decay behavior.BRICKTECH is a new research project which aims to develop a combined multianalytical approach for studying the relationships between mineralogical-textural and physical-mechanical characteristics, and decay behavior of traditional bricks. More in detail, the project is addressed to define a method to quan-tify both microstructures, with particular reference to porosity, pore distribution, size and shape, using image analysis and micro-tomography, and mineralogical composition, through quantitative phase anal-ysis. All these features are correlated to the physical-mechanical properties, such as hydro properties, uniaxial and triaxial and flexural strength, strength anisotropy, and strength undergoing long-term creep processes. In order to do this, a selection of clay materials collected from the alluvial deposits of the Bac-chiglione and Brenta rivers, form the Padova and Venice surroundings, which are basically illitic-chloritic but differ both in terms of grain-size and mineralogical bulk composition, are quantitatively character-ized in terms of grain-size, and chemical and mineralogical composition. Bricks obtained for firing these clays at increasing temperature of 50°C, in the interval between 600 and 1100°C, are then studied under a microstructural, mineralogical and physical viewpoints to correlate the compositional and structural features with the intrinsic properties of the bricks. These texts allow to identify the most efficient and durable products which can be used for restoration of historical buildings, providing a useful tool for the optimization of firing conditions, changing the production recipes according to a sort of “mix design” for traditional brick production, similarly to what is routinely done for concrete.With this contribute, the authors would like to present the project and the preliminary results on the characterization of the raw materials and of some of the fired experiments carried out on a selection of clays.
Bricktech: combined multianalytical approah for the mix-design of bricks to use in restoration of historic brick mansonary in Veneto
Coletti C.;Mazzoli C.
2013-01-01
Abstract
Brick masonry constitutes an important part of the construction materials found in historic buildings in Veneto (north-eastern Italy). Their production started in the Roman Times, exploiting the locally avail-able clay materials forming the vast Padan plain valley. Selection of different quarrying areas, changes in the production recipes and in firing techniques determined the production of bricks characterized by different physical-mechanical properties, particularly with respect to the decay behavior.BRICKTECH is a new research project which aims to develop a combined multianalytical approach for studying the relationships between mineralogical-textural and physical-mechanical characteristics, and decay behavior of traditional bricks. More in detail, the project is addressed to define a method to quan-tify both microstructures, with particular reference to porosity, pore distribution, size and shape, using image analysis and micro-tomography, and mineralogical composition, through quantitative phase anal-ysis. All these features are correlated to the physical-mechanical properties, such as hydro properties, uniaxial and triaxial and flexural strength, strength anisotropy, and strength undergoing long-term creep processes. In order to do this, a selection of clay materials collected from the alluvial deposits of the Bac-chiglione and Brenta rivers, form the Padova and Venice surroundings, which are basically illitic-chloritic but differ both in terms of grain-size and mineralogical bulk composition, are quantitatively character-ized in terms of grain-size, and chemical and mineralogical composition. Bricks obtained for firing these clays at increasing temperature of 50°C, in the interval between 600 and 1100°C, are then studied under a microstructural, mineralogical and physical viewpoints to correlate the compositional and structural features with the intrinsic properties of the bricks. These texts allow to identify the most efficient and durable products which can be used for restoration of historical buildings, providing a useful tool for the optimization of firing conditions, changing the production recipes according to a sort of “mix design” for traditional brick production, similarly to what is routinely done for concrete.With this contribute, the authors would like to present the project and the preliminary results on the characterization of the raw materials and of some of the fired experiments carried out on a selection of clays.
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