Rebound hammer test is done to find out the compressive strength of concrete by using rebound hammer.The rebound of an elastic mass depends on the hardness of the surface against which its mass strikes. When the plunger of the rebound hammer is pressed against the surface of the concrete, the pring-controlled mass rebounds and the extent of such a rebound depends upon the surface hardness of the concrete. The rebound value is read from a graduated scale and is designated as the rebound number or rebound index. The compressive strength can be read directly from the graph provided on the body of the hammer.
The following standards can be applied to the Schmidt Hammer:
1. ISO DIS 8045
2. EN 12 504-2
3. ENV 206
4. BS 1881, part 202
5. ASTM C 805
6. ASTM D 5873 (rock)
7. DIN 1048 Part 2
8. B-15.225
9. NF P 18-417
10. ( J6J / T23-2001, JJG 817-1993, both China )
Schmidt Hammer Type ND |
Schmidt Hammer Type LD |
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Schmidt Hammer | ||
Impact energy | 2.207 Nm | 0.735 Nm |
Measuring range | 10 - 70 N/mm2 | 18 - 70 N/mm2 |
Concrete compressive strength | 1'450 - 10'152 psi | 2'610 - 10'152 psi |
Display Unit | ||
Display | graphic LCD-Display 128 x 128 pixel | |
Internal data storage | non-volatile memory, 250 measurement series of 10 measurements each | |
Communication | RS 232 or with adapter to USB | |
PC application | ProVista | |
Battery type | six LR6 (AA) batteries, 1.5 V for 60 h operation | |
Operating temperature | 0 °C to +60 °C | |
Storage temperature | -10 °C to +60 °C |
Model | HT-225D | HT-75D | HT-20D | |||
Display | OLED Digital | |||||
Measuring Range |
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Accuracy | ±0.1R | |||||
Impact energy | 0.255kgm(2.207Nm) for testing ordinary building and bridge construction |
0.075kgm(0.735Nm) for testing small and impact-sensitive parts of concrete artificial brick |
0.020kgm(0.196Nm) for testing mortar or clay of products |
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Communication | USB2.0 or Bluetooth (optional) | |||||
Storage | data for 4000 concrete structures | |||||
Operating Temperature | 40°~60°C | |||||
Power Supply | 3.7 Li-ion rechargable battery charged via USB port | |||||
Dimension | 280x75x60mm | |||||
Weight | 1kg |
Mechanical data | Type ST N / PC N concrete test hammer |
Type ST L / PC L concrete test hammer |
Impact energy | 2.207 Nm | 0.735 Nm |
Hammer mass | 135g | 135g |
Spring constant | 0.79 N/mm | 0.26 N/mm |
Spring extension | 75 mm (2.95”) | 75 mm (2.95”) |
Housing dimensions | 55 x 55 x 255 mm (2.16” x 2.16” x 9.84”) | |
Weight | 570 g (1.3 lb) | |
PC application | ||
Only for the concrete test hammer SilverSchmidt versions PC N and PC L: Hammerlink Software | ||
Electrical data | ||
Display | 17 x 71 pixels; graphic / alphanumeric | |
Power consumption | ~13 mA measuring, ~4 mA setup and review, ~0.02 mA idle | |
Battery life | >5000 impacts (before recharging) | |
Charger connection | USB type B (5V, 100 mA) | |
Measuring ranges | ||
Concrete compressive strength | 10-100 N/mm2 (1450-14500 psi) | |
Operating temperature | 0 to 50 °C (32 to 122 °F) | |
Battery life | >5000 impacts (before recharging) | |
Storage temperature | -10 to 70 °C (14 to 158 °F) |
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