1results about How to "Enough deformation" patented technology

This utility model discloses a rebound hammer for non-destructive testing of UHPC compressive strength, belonging to the field of concrete engineering testing technology. It includes a hollow shell, an impact rod, an impact hammer, an impact spring, a guide rod, a hook assembly, and a switch. The impact rod is telescopically connected to one end of the shell. One end of the impact spring is fixed, and the other end is connected to the impact hammer. Both the impact hammer and the hook assembly are slidably connected to the guide rod. The hook assembly can slide along the guide rod and engage with the impact hammer. The switch controls the release of the impact hammer by the hook assembly. The free length of the impact spring is 134.4±0.5mm, and the impact length after stretching is 140.0±0.5mm. The wire diameter of the impact spring is greater than 1.5mm. The UHPC compressive strength regression equation is: ; the value of c ranges from -0.001 to -0.004, where is the average rebound value of the test area or specimen, is the average carbonation depth of the test area, and is the converted value of concrete strength in MPa. This enables non-destructive testing of the compressive strength of UHPC.