Disk device and stem, pre-inserted in the concrete.
The insert pre-inserted for testing pull-out is made according to the specifications given by the UNI EN 12504-3.
The disc has a circular head of 25 mm in diameter.
The rod has a diameter not greater than 0.6 times the diameter of the disc.
The length of the rod, measured from the surface of the concrete up to the nearest surface of the disc, is equal to the diameter of the disc.
The sides of the stem are smooth and tapered, with the larger diameter at the point closest to the surface of the concrete, to minimize the friction during the test.
The device is coated with a release agent to prevent adhesion to concrete. The disc and the stem are usually inserted subsequently hardening of the concrete.