Concrete Test Hammer, Length : 5-10 Inches

The concrete test hammer is a hand held instrument used for testing the quality of hardened concrete in a structure. On new structure, the instrument can be used to give an indication of the gain in concrete strength, while on existing structures, it can be used to gain an estimate of the uniformity of the concrete. The instrument works on the principle that the rebound of an elastic mass impacting on a surface is a function of the hardness of the structures itself. Hence the harder the surface, the greater is the rebound distance.
Operation
the test sequence consist of:
1. prior to using the hammer, the surface of the concrete is first abraded with the carborandum stone to remove surface irregularities.
2. the hammer is then pushed firmly against the concrete until the trigger button is automatically released.
3. hand pressure is then reduced, to allow the plunger to fully emerge from the instrument.
4. extra hand pressure is then applied to push the plunger back into the instrument, compressing the internal spring to a point where the trigger mechanism over-rides and causes the impact force to be applied to the surface.
5. still applying hand pressure, the push button is pressed to lock the plunger in place, retaining the reading on the graduated scale.
6. the strength corresponding to the reading on the scale is then noted.
7. if concrete test cubes from the structure are available, then using the hammer on these will allow
specifications
rebound range 10 to 80
rebound value on anvil 80 + 2
impact kinetic energy 2.207 jules
spring rigidity 7.85 n
impact stroke 75 mm
material of hammer body aluminum
other accessories calibration chart, carborandum stone and carry case (included)
size and weight (may differ) dia 60 x 280 mm, 1 kg.
If not provided in written, please contact us for latest specifications as they are subject to changed without notice.