TESTING AND EVALUATION OF CONCRETE STRENGTH IN STRUCTURES

Different procedures for material and structural investigations are adopted in British practice when assessing (a) noncompliance of concrete under construction and (b) the current strength of concrete in structures. This paper presents these proceduree and describes the various factors that have to be taken into account depending on whether the potential strength, the actual strentgth, or the in situ cube strength is required in the investigation. Emphasis is placed on the usefulness of performing nondestructive tests on site to optimize the manner of extraction of cores and combining these results with those derived from cores.