Concrete test hammer,concrete rebound hammer,concrete rebound test hammer

The concrete hammer is a hand held instrument used for testing the quality of hardened concrete in a structure.
On new structures, once the concrete has hardened, the instrument can be used to give an indication of the gain in concrete strength.
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 surface itself. Hence the harder the surface, the greater is the rebound distance.
The test sequence consists of:
1. prior to using the hammer, the surface of the concrete is first abraded with the carborundum stone to remove surface irregularities.
2. the hammer is then pushed firmly against the concrete until the 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 a more accurate answer to be established.

Testing the strength of concrete, the concrete test hammer uses a certain elastic force to transit the impact force of an impact hammer to the surface of concrete, its initial kinetic energy redistributes, a part of energy in the form of plastic deformation or residual deformation is adsorbed by the concrete, and another part of energy which is proportional to the surface hardness is transmitted to the impact hammer, making the hammer resile to a certain height, then the strength of the concrete is derived from the proportional relation between the height of resilience and the concrete strength. With the merits of simple structure, easy correction, maintenance and repair, and portability, the concrete test hammer is widely used in civil engineering and construction industry for testing the strength of concrete. Compared to other nodestructive testers, the concrete test hammer is an economical and practical nondestructive testing instrument.It is used for testing the strength of various concrete members (slab, beam, column, truss) of normal building strength and bridge.

Specification:

Digital Rebound Test Hammer DCH002:

Feature:
1. LCD large screen, high-resolution 160 * 160 (general LCD resolution is 160*128 in market) 2. Low-power : with AA alkaline batteries 2 pcs (general products with 6 pcs in market) 3. As per this product with sweet voice report rebound value function, therfore, it can to improve the working efficiency of inspecter. (general products without voice report rebound value function in market) 4. Using USB communication interface, then it can quickly export component data after connecting PC.(communication interface for general products is RS232 in market) 5. Easy to operate, the abnormal value can be removed automatically, after software set the rebound value for upper and lower limited. 6. Reboound hammer's mechanical parts using imported materials, processing precision of parts is very high due to use CNC machining center equipments, and it with long product life. It has a high performance and lower price advantage in market.
Spec:
1. Measuring strength ranges: 10-60MPa
2. Normal impact energy: 2.207J
3. Stiffness of strike tension spring: 785N/cm
4. Strike hammer stroke: 75mm
5. The consistency of the sample displayed values: ≤±1(difference value between digital sampling output value  and the pointer readings)
6. The rebound values calibrated on steel anvil: 80±2
7. Power: 1.5V AA alkaline batteries 2pcs
8. Power consumption: sampling case ≤50mA(average current); idle case: ≤20mA
9. Storage: 100*50*16=80000 testing results

Intergrated Rebound Hammer/Concrete rebound test hammer with voice ICHT003:

Features
1.The host (with sensor) and display set using integrated design, easy to operate.(generally, using to separate design in market)
2.High-resolution LCD color screen 176x220(generally, LCD using non-color and low-resolution screen in market)
3.Large-capacity and rechargeable lithium battery, environmental conservation and energy saving, long service life. It can be used repeatedly and not need re-investment.(generally using alkaline batteries in market)
4.Sensor type using non-contact metal reflection grating + reflective encoder system, it with high accuracy and long  service life and never wear(generally, sensor using transmission-type grating system in market)
5.Rebound value by voice reported, LCD digital display, and mechanical pointer indicating are triple, it ensure that the accuracy of the data is reliable. When user field work and battery run out, it still can get the inspection results through using the mechanical pointer readings. Voice reported rebound value can improve the efficiency of work at special environment. (generally, without voice function in market .)
6. Using USB communication interface, then it can quickly export the component data after connect to PC.(normal using RS232 communication interface in market.)
7. Easy to operate, the software set the upper and lower limiting rebound values, the abnormal value can be  removed automatically.
8. Rebound hammer's some mechanical parts using imported materials, processing precision of parts is very high due to use CNC machining center equipments, and it with long service life. It has a high performance and lower price advantage in market.

Specification
1. Measuring strength ranges: 10-60MPa
2. Normal impact energy: 2.207J
3. Stiffness of strike tension spring: 785N/cm
4. Strike hammer stroke: 75mm
5. The consistency of the sample displayed values: 0.5(difference value between digital sampling output value and the pointer reading)
6. The rebound values calibrated on steel anvil: 80+/-2
7. Display: 16-bit true color, 176 x 220 resolution, 5 grades backlight adjustment
8. Data storage capacity: 300x100x16=480000 inspecting  results, 20 special measurting strength curves, and it could also be add by user own according to need .
9. Power: 3.6V/1300mAH recharging lithium battery, charging power adapter 5V/2A. Maximum backlight, turn off speech cases, it can be continuous work 13 hours.
10. Power consumption: Maximum backlight situation≈100mA (Voice off)
Communication interface:USB2.0 full-speed
Weight:1.1Kg

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