Abstract
The repairs of building structures are inevitable and indispensable. Repairs are used to restore or maintain the usability of existing facilities, often contributing to the extension of their expected service life, increasing the sustainability of building resources. Given that conservation rules are observed, repairs are also used to save monuments. The concept of repair durability brings to the foreground the durability of the repaired structure (after repair): what service life has been obtained/recovered as a result of the repair. Based on the available data (limited set), a generalised distribution function of repair durability was developed, with a disappointing course. This, however, applies (necessarily) to the past. Significant progress was shown to have been achieved in the theoretical and technical fundamentals of technical repair measures. In this situation, a prognostic distribution function was also designed for future repairs according to EN 1504. A rule of thumb called estimating concrete repair durability, CRD was proposed. The risk associated with estimating the durability of repairs was indicated. A reason for optimism is that proactive monitoring of the condition of the structure and, consequently, management of the repair strategy allows to reach the designed life of the structure.
Highlights
Durability is the building structure’s ability to remain in a functional condition, expressed in time units
The typical repair cycles presented in the standard, referring to the service life of a building structure subjected to degradation (Figure 5), are somewhat idealised and
The typical repair cycles presented in the standard, referring to the service life of a building structure subjected to degradation (Figure 5), are somewhat idealised and simplified:
Summary
Durability is the building structure’s ability to remain in a functional condition, expressed in time units. Concrete structures are designed to provide at least 50 years of service, while public and monumental buildings are intended to last even longer. The inevitability of repairs is subject to the random nature of impacts on the structure, including: hitting, overloading, explosion etc., as well as extraordinary weather impacts (gusts of wind, extreme precipitation). That stone/brick skeletons have a much longer tradition in construction than that of Portland cement concrete, the historical approach to structural repairs is much deeper for masonry structures. In this context, it is worth recalling the very significant history of St. Peter’s dome repairs [7]. In light of the above, the question about durability gains special meaning
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