Standards and guidance for selection of repairs

We have seen that the selection of a suitable rehabilitation can be based on technical considerations and cost (preferably whole life costing rather than just initial installation cost). The technically unacceptable can be excluded and a short list of suitable rehabilitations can be drawn up. Life cycle cost analysis techniques have been used to calculate the optimum time and the optimum repair on bridges but are based on a number of assumptions and estimates, including cost estimates for different repair strategies. A direct comparison of quotations for a given structure is probably the best present state of the art although it is important to accurately define the corrosion conditions so that accurate bills of quantities can be drawn up. 

A major European standard for repair methods, selection specification and installation is nearing completion with the publication of EN1504 parts 1-10. These documents are designed to meet the harmonized products directive and are principally concerned with the materials used in non-electrochemical concrete repair, their testing prior to use and the site application. Table 8.2 lists the standards. From the point of view of selection and application of repairs parts 9 and 10 are key parts of this standard. 

In part 9, structural repairs and corrosion repairs are covered separately. The corrosion methodology is summarized in Table 2 Principles and Methods Relating to Reinforcement Corrosion. This is reproduced as Table 8.3. 

A systematic method of using EN1504 would be as follows  

10 Site application of products and systems and quality control of the works 

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