Until 2019, the assessment has been based on BS EN 13791:2007 complimented by the UK guidance document BS 6089:2010 together with BS EN 12504-1:2009. This cube strength is akin to a cube taken from the structure and is not the same as a standard 28 day cured cube strength. The assessment of concrete strength in existing structures adopts an approach which determines an ´equivalent concrete in-situ cube strength´. Further information on the development of specified concrete strengths over the years is given in Concrete Society Technical Report 70, Historical approaches to the design of concrete buildings and structures.Ĭlearly cores should NOT be taken at highly stressed locations, which could lead to structural damage. If details of the Standards to which the structure was designed and constructed are available, these can obviously be used to obtain an indication of the expected concrete strength. This is generally done by taking cores at representative locations in the structure, to give a good overall indication of the strength. There may be a need to assess the strength of the concrete in an existing structure, perhaps to determine its ability to carry additional loads or following modification.
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