Abstract
The paper presents the case study of the degradation of architectural precast concrete elements on the facade of St. Michael the Archangel church in Warsaw. The background of the contemporary precast non-standard prefabrication was presented with the examples of polish recent applications. The GPR (ground penetrating radar) method was used in determining the location of reinforcement in the precast elements in the degraded façade. The conceptions of repair were analyzed and the reasons of the destructions of the precast elements.
Highlights
The paper presents the case study of the degradation of architectural precast concrete elements on the facade of St
The required durability in monumental buildings, to which sacred objects belong, exceeds 50 years, accepted according to PN-EN 206 as the basic period of concrete durability, provided in the case of meeting the requirements for composition and components given in this standard for individual concrete exposure classes
The tests were carried out using the Ground Penetrating Radar (GPR) method [2, 3] and the execution of local opencasts from the self-supporting lagging of the rods
Summary
Concrete prefabrication gives wide possibilities for shaping the structure, spatial form and aesthetics This allows to create objects in accordance with the vision of architects and the expectations of investors and users. Shaping the durability of concrete elements includes activities undertaken at all stages of their formation, including at the stage of designing, selection, production and supply of materials, as well as technology of building construction. The key step in designing a concrete element is durability, depending on required concrete cover thickness This selection takes into account environmental conditions of exploitation (exposure class), as well as conditions of adhesion of concrete to reinforcement and fire resistance of the element
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