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Summary of Contents for Humboldt H-2987H
- Page 1 11.16 H-2987H Concrete Rebound Hammer...
- Page 2 Using the Humboldt Concrete Rebound Hammer Always hold the Concrete Rebound Hammer in both hands while in use. Also, when in use, keep the hammer perpendicular to the surface you are testing with the scale pointing up, making it easier to read.
- Page 3 Figure 3: Push the piston in as far as it will go To perform a test, make sure the piston is extended and gently press the Rebound Hammer against the concrete surface to be tested. When the piston is pressed all the way into the Rebound Hammer, continue to push harder until you hear a rattling sound.
- Page 4 Surfaces to Avoid Avoid testing concrete that is: • Frozen • Honeycombed or excessively porous • Known to have rebar 2cm or less below the surface • Carbonated on the surface If you must test a mature concrete surface that is damp from rain or flowing water, or if you must test new concrete, keep in mind that you will probably get rebound numbers that are lower than they should be.
- Page 5 Reading your Results Make at least ten readings from a concrete surface and discard the highest and lowest rebound numbers. Average the remaining eight numbers. If desired, take a few test readings before you complete your series of ten regular tests. Use the average rebound number to estimate the strength of the concrete.
- Page 6 Maintenance We recommend that you calibrate your Rebound Hammer regularly using the Humboldt Calibration Anvil, H-2972, ordered separately. For a Rebound Hammer, you should start verifying the readings after approximately 2,000 uses (or completed tests). You should also verify the readings if you have reason to suspect that your Rebound Hammer is giving you false data.
- Page 7 Humboldt provides Repair and calibration services for concrete rebound hammers, Call: 1.800.544.7220 H-2987 Replacement Parts Description Part# Impact Plunger H-2975.1 Housing, complete H-2975.3 Rider with Guide Rod H-2975.4 Push-button, complete H-2975.6 Hammer Guide Bar H-2975.7 Guide Disk H-2975.8 H-2975.9 Two-part Ring H-2975.10...
- Page 8 Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg.
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