Abstract
Interventions in historic brick buildings require an exhaustive analysis of the current characteristics of bricks in order to establish the role performed by these elements in the buildings. This study presents the results of an experimental analysis of the compressive strength of brick specimens extracted from different buildings built in the 19th and 20th centuries in the province of Zamora (Spain). The study analyses specimens with very different characteristics to compare results from different masonry units and manufacturing processes. Specimens are classified into four groups according to their macroscopic and microscopic analyses. Compressive strength results are correlated to the above classification and to the results of density, absorption and open porosity of the samples. The compressive strength results present high variation between clay bricks (9.2–64.4 N/mm2) and between samples extracted from the same brick due to the heterogeneity of the material. Correlations between compressive strength and open porosity, absorption and dry density values are observed, with less dispersion in the case of high sintering level, up to 1000 °C. Finally, the compliance with the current Spanish Technical Building Code with respect to their compressive strength is checked.
Highlights
Many studies on interventions in historical masonry buildings, such as those conducted byBinda et al [1], Papayianni and Stefanidou [2], Lourenço and Fernandes [3], Brandonisio et al [4] and Vintzileou [5], point to the importance of knowing the manufacturing conditions and the compressive strength, as well as the compatibility with other materials
Excluding brick 5, the open porosity of clay bricks exhibits low coefficient of variation (CoV) compared with the old bricks analysed by Fernandes et al [35], mainly in the case of bricks from G4
The clay bricks classified as G1 and G2 exhibit higher open porosity values (19.2–31.2%) and CoV, reaching 40.92%
Summary
Many studies on interventions in historical masonry buildings, such as those conducted by. The mechanical behaviour and compressive strength of masonry buildings, as simulations can predict. Out on ancient clay brick samples extracted from facades of different buildings built in the. This paper analyses the results of compressive strength tests carried out 20th on ancient clayinbrick province of Zamora during their intervention workinincludes the samples extracted from(Spain) facades of different buildings built in or the demolition. The strength clay bricks isand related to their physical analysis of the porosity, andcompression density, as well as theofmacroscopic microscopic study of properties, and manufacturing the material.origin. Technical [21], which facilitates therequirements evaluation of state of ofthe conservation of the Lastly,Building the studyCode checks on compliance with the of the BD SE-F. Building Code [21],by which the evaluation of the state of conservation of the building, required by Law 8/2013 LRRRU [22]
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