The Original Schmidt hammer was first introduced during the 1950s. Its was designed and manufactured by Proceq in Switzerland.
It has since gone on to become the worlds most widely used instrument for non-destructive assessment of concrete strength.
Built from all original materials, these units are not to be confused with cheaper imitation units currently on the market. Some of these rival units are manufactured from cheap internal components. This can result in a very short lifespan and high repair costs.
The Proceq Original Schmidt Hammer is available in either ‘Type N’ or ‘Type L’ specification. N being higher and L being lower impact energy depending on the material being tested. ‘Type N’ hammers should be used on concrete 100 mm or more thick. ‘Type L’ can be used on 50 mm or thicker surfaces.
The hammer has an analogue gauge on the side displaying rebound value. Yearly calibration is required.
Schmidt hammer Use
The Schmidt Hammer should be used on a smooth flat concrete surface. The supplied grindstone can be used to prepare the test area if required.
A series of at least 8-10 tests should be carried out at a minimum of 20 mm apart over the predetermined test area. Once complete the highest and lowest results should be discarded and the remaining results used as an average. This should then be plotted onto the appropriate graph to determine the estimated compressive strength value.
On site verification of the Schmidt hammer accuracy can be required. We now stock small, lightweight test anvils for on site verification. These can be used with the type N or type L hammers. The anvils are supplied with their own calibration certificates for trace-ability. Please notify a member of our team if an anvil is required when ordering.
A copy of the instruction manual can be found here.
The latest iteration of the Schmidt Hammer can be found here.