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The locations of all drilling points shall be chosen so that the core contains no steel parallel to its length. Once prepared for test the core shall have a length at least equal to the diameter and not more than 1. Where possible mm cores should be taken to reduce the variability due to drilling and increase the reliability of the testing, unless reinforcement is congested and the use of mm cores will reduce the possibility that the core will contain steel or it is necessary to restrict the sampling to a length of less than mm.
A photograph shall be taken of the cut core with the phenolphthalein solution applied to provide a record of the test. If when testing at the second location, the core again breaks due to honeycombed or defective concrete the freshly cut core shall be retained for reference and a note made of the condition.
The Contractor shall carry out calibrations of the electric magnetic device for a particular bar size to allow the bar diameter to be measured. The cover shall also be recorded on the concrete surface with chalk or a suitable non-permanent marking pen. The length of the pulse part between the transducer equipment shall be measured, and the pulse velocity calculated. A minimum of 40 velocities shall be measured for each structural element.
The transducers shall be mounted on a specially formed moulded surface. The precision of the correlation curve between the mean rebound number and strength shall be stated and this shall be used when reporting any strength interpretations from surface hardness readings.
BS EN 12504-2:2012
DIN EN 12504-2