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The compressive test on drilled concrete cores is the most reliable method to determine the
concrete strength of existing structure. This paper reports on a recent laboratory investigation devoted to the effect of maximum aggregate size and core diameter on the estimation of the characteristic strength of current concrete (C25/30 class). The compr...
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Citations
... This technique consists of the extraction of cores with a selected diameter and a slenderness ratio to perform destructive test. The derived compressive strengths are used to assess the actual compressive strength of the in-place hardened concrete (CEN EN 13791, 2019, Benidir et al., 2018). Drilling cores with large diameter and high slenderness ratio depends strongly on steel cover thickness and concrete volume (Carrol et al., 2016). ...
This paper studies the influence of the core diameter and the slenderness ratio on the assessment of the actual compressive strength of hardened concrete. The experiment consists of the preparation of a reinforced column with longitudinal bars and stirrups and proceed to the extraction and the crushing of cores with different diameters, 50, 75 and 100 mm. The length to diameter ratio of the drilled cores is ranging from 1 to 2. A prepared C25/30 concrete class with a standard consistency and a maximum aggregate size of 25 mm is used. The results show that there is a positive correlation between the diameters of the cores and their respective compressive strengths. Independently from the slenderness ratio, the enlargement of core diameters is accompanied by the increase of the compressive strengths of cores. Furthermore, the influence of the slenderness ratio is significantly important for a diameter of cores less than 100 mm. The small diameter (50 mm) appears to be more sensitive to the effect of the slenderness ratio. Valuable details about the use of strength correction factors for concrete are also presented.
