Testing and Repair of Concrete in the Context of Post-Fire Forensic Investigation and Structural Assessment

Forensic investigations in concrete structures with fire damage is challenging, as concrete beneath the surface might have damage, even if the concrete surface might seem undamaged. When there is damage, determining the best repair approach is complex and depends on the type of damage and damaged elements. This paper discusses different elements of the post-fire investigation such as visual observations, surveys, and non-destructive and destructive testing. We also discuss different approaches to repair, illustrating these points using examples from real concrete buildings that have experienced fire damage. The review includes the typical types of laboratory testing recommended in the context of a post-fire forensic investigation and post-fire structural assessment and how the interpretation of their results can guide the engineer to identify the best repair design. The discussion also includes examples of how engineering and practical considerations drive the decision on the appropriate repair approach. These examples show the fundamental role that testing and interpretation of the results have in guiding the design of repairs. This paper is intended to illustrate the process of investigation, rather than being an exhaustive discussion of all the potential approaches and tests.