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Rock Schmidt Hammer RS 8000 L TYPE

short info

The Rock Schmidt Type N has the standardized impact energy of 2.207 Nm. It is ideally suited for field testing.
The Rock Schmidt Type L with impact energy 0.735 Nm is more suited to testing on cores.

Standard

ASTM D 5873 (Rock)

Model

RS 8000 L TYPE

Origin

Indian

Make/ OEM

VERTEX

Brochure

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  • Description

  • SPECIFICATIONS

  • FEATURES

  • VIDEO
  •  New
    WORKING PRINCIPAL

OVERVIEW

Rockschmidt Hammer

RockSchmidt is the most advanced rebound hammer used for measuring hardness, strength, and uniformity testing of rock formations for the evaluation of geological properties.

The RockSchmidt hammer finds application, especially in rock testing applications and penetration rate prediction for tunnel boring machines and rotary drum cutters.

Additional geological applications include study of the Correlation to unconfined compressive strength of rock / Estimation of weathering grade / Estimation of modulus of elasticity of rock.

The ISRM & ASTM D 5873, both guidelines have been applied in RockSchmidt hammer for the procedure to determine the rebound number.

The ASTM D 5873 method requires 10 impacts from which a mean is calculated. Individual impacts that differ by more than ±7 from the calculated mean are discarded and a new mean is calculated from the remaining values.

Whereas, in ISRM method 20 readings are required with no deletion of outliers. A series may be terminated prematurely if any 10 subsequent readings differ by ±2. On completion of 20 readings the Rock Schmidt calculates the mean and the range.

When performing rebound hammer test on rock or core samples, both ASTM and ISRM methods recommend the use of a heavy specimen holder to prevent damage to the cores on impact.

The Proceq Rebound Hammer has impact angle independence feature; thus, rebound value is independent of impact direction.

The Rock Schmidt Type N has the standardized impact energy of 2.207 Nm. It is ideally suited for field testing.

The Rock Schmidt Type L with impact energy 0.735 Nm is more suited to testing on cores.

Rebound rockschmidt hammers have historically been used for many rock testing applications. Such as:

• Geomorphological applications which investigate the bulk hardness properties of a rock outcrop.

• Prediction of weathering grades

• Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)

• Correlation to Young’s Modulus

• Prediction of penetration rates for tunnel boring machines and rotary drum cutters.

• Testing on cores and blocks

Features

  • Impact Angle Independence: The rebound value is independent of the impact direction.
  • Optimized for Field Work: Dirt and dust intrusion protected for longer life, significantly lighter and more ergonomic, Ease of data storage & reporting make it the best choice for field work.
  • Preset Statistics: Statistics methods recommended by ISRM and ASTM are implemented into the hammer allow automatic calculation of the rebound number.
  • Unconfined Compressive Strength Test: The RockSchmidt hammer allow unconfined compressive strength (UCS) test.
  • Young’s (E-) Modulus: ISRM recommends a correlation between elastic modulus and the rebound value based on the formula Et = cedR (where R is the rebound value), A correlation in this format may be defined in the software and downloaded onto the Rock Schmidt.
  • Weathering Grade: Impacting on the same location twice can be used to correlate to weathering grade. The ISRM recommended method has been included in the device.

Specification

Impact energy (N) 2.207 Nm, (L) 0.735 Nm
Dimensions of housing 55 x 55 x 250 mm (2.16” x 2.16” x 9.84”)
Weight 570 g
Max. impacts per series 99
Memory capacity Dependent on length of test series Example: 400 series of 10 impacts
Display 17 x 71 pixel, graphic
Battery lifetime > 5000 impacts between charges
Operating temperature 0 to 50°C (32 to 122°F)
IP Classification IP54

 


Related Searches

SPECIFICATIONS

RockSchmidt is the most advanced rebound hammer used for measuring hardness, strength, and uniformity testing of rock formations for the evaluation of geological properties.

Rebound rockschmidt hammers have historically been used for many rock testing applications. Such as:

• Geomorphological applications which investigate the bulk hardness properties of a rock outcrop.

• Prediction of weathering grades

• Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)

• Correlation to Young’s Modulus

• Prediction of penetration rates for tunnel boring machines and rotary drum cutters.

• Testing on cores and blocks

Features

  • Impact Angle Independence: The rebound value is independent of the impact direction.
  • Optimized for Field Work: Dirt and dust intrusion protected for longer life, significantly lighter and more ergonomic, Ease of data storage & reporting make it the best choice for field work.
  • Preset Statistics: Statistics methods recommended by ISRM and ASTM are implemented into the hammer allow automatic calculation of the rebound number.
  • Unconfined Compressive Strength Test: The RockSchmidt hammer allow unconfined compressive strength (UCS) test.
  • Young’s (E-) Modulus: ISRM recommends a correlation between elastic modulus and the rebound value based on the formula Et = cedR (where R is the rebound value), A correlation in this format may be defined in the software and downloaded onto the Rock Schmidt.
  • Weathering Grade: Impacting on the same location twice can be used to correlate to weathering grade. The ISRM recommended method has been included in the device.

Specification

Impact energy (N) 2.207 Nm, (L) 0.735 Nm
Dimensions of housing 55 x 55 x 250 mm (2.16” x 2.16” x 9.84”)
Weight 570 g
Max. impacts per series 99
Memory capacity Dependent on length of test series Example: 400 series of 10 impacts
Display 17 x 71 pixel, graphic
Battery lifetime > 5000 impacts between charges
Operating temperature 0 to 50°C (32 to 122°F)
IP Classification IP54

 

FEATURES

Rockschmidt Hammer

RockSchmidt is the most advanced rebound hammer used for measuring hardness, strength, and uniformity testing of rock formations for the evaluation of geological properties.

The RockSchmidt hammer finds application, especially in rock testing applications and penetration rate prediction for tunnel boring machines and rotary drum cutters.

Additional geological applications include study of the Correlation to unconfined compressive strength of rock / Estimation of weathering grade / Estimation of modulus of elasticity of rock.

The ISRM & ASTM D 5873, both guidelines have been applied in RockSchmidt hammer for the procedure to determine the rebound number.

The ASTM D 5873 method requires 10 impacts from which a mean is calculated. Individual impacts that differ by more than ±7 from the calculated mean are discarded and a new mean is calculated from the remaining values.

Whereas, in ISRM method 20 readings are required with no deletion of outliers. A series may be terminated prematurely if any 10 subsequent readings differ by ±2. On completion of 20 readings the Rock Schmidt calculates the mean and the range.

When performing rebound hammer test on rock or core samples, both ASTM and ISRM methods recommend the use of a heavy specimen holder to prevent damage to the cores on impact.

The Proceq Rebound Hammer has impact angle independence feature; thus, rebound value is independent of impact direction.

The Rock Schmidt Type N has the standardized impact energy of 2.207 Nm. It is ideally suited for field testing.

The Rock Schmidt Type L with impact energy 0.735 Nm is more suited to testing on cores.

Rebound rockschmidt hammers have historically been used for many rock testing applications. Such as:

• Geomorphological applications which investigate the bulk hardness properties of a rock outcrop.

• Prediction of weathering grades

• Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)

• Correlation to Young’s Modulus

• Prediction of penetration rates for tunnel boring machines and rotary drum cutters.

• Testing on cores and blocks

PRODUCT VIDEO

WORKING PRINCIPALNew

Certainly, here is a basic operating manual for a rebound test hammer, commonly used for non-destructive testing of concrete structures:

Rebound Test Hammer Operating Manual

1. Introduction: The rebound test hammer is a portable device used to assess the surface hardness and, indirectly, the compressive strength of concrete structures. This test is non-destructive and widely employed in construction and civil engineering for quality control and structural assessment.

2. Safety Precautions:

  • Always wear appropriate personal protective equipment, including safety glasses and gloves.
  • Ensure a safe distance from other workers during testing to prevent accidents.
  • Handle the rebound test hammer with care to avoid damage to the instrument or injury to the operator.

3. Equipment Setup:

  • Ensure the rebound test hammer is in good working condition and calibrated regularly.
  • Adjust the instrument’s impact energy, typically indicated as “N” for normal and “L” for low. Select the appropriate setting based on the expected strength of the concrete.
  • Ensure that the hammer’s plunger and the concrete surface are clean and free from loose particles or debris.

4. Test Procedure: Follow these steps to perform a rebound test:

a. Hold the rebound test hammer firmly with one hand, making sure not to touch the plunger during testing.

b. Position the instrument perpendicular to the concrete surface at the location to be tested. Ensure the plunger makes direct contact with the surface.

c. Apply a firm, quick, and consistent force to the instrument’s trigger with your other hand. This causes the plunger to impact the concrete surface.

d. After impact, the rebound test hammer will rebound off the surface. Observe and record the rebound distance (R) indicated by the scale on the instrument. This scale typically ranges from 10 to 100, with higher values indicating higher concrete hardness.

e. Repeat the test at multiple locations to obtain a representative assessment of the concrete hardness.

5. Interpretation of Results: The rebound distance (R) obtained from the instrument needs to be correlated with the compressive strength of the concrete. This correlation can be established using calibration curves provided by the manufacturer or local standards.

6. Maintenance:

  • Clean the instrument after each use to prevent debris from affecting future measurements.
  • Periodically calibrate the rebound test hammer according to the manufacturer’s recommendations.
  • Inspect the instrument for any damage or wear, particularly the plunger and the rebound scale.

7. Reporting: Record the rebound values obtained during testing and correlate them with the concrete’s compressive strength. Include all relevant details such as test locations and any anomalies observed during testing.

Always refer to the specific manufacturer’s instructions for your rebound test hammer, as operating procedures may vary slightly between models. Proper maintenance and calibration are essential to ensure accurate and reliable results in concrete hardness assessments.

8. Troubleshooting: If you encounter issues during testing, such as inconsistent rebound values or unusual readings, consider the following troubleshooting steps:

  • Ensure that the instrument is calibrated correctly, and the impact energy setting matches the concrete’s expected strength.
  • Check the cleanliness and condition of both the plunger and the concrete surface.
  • Verify that the instrument is held perpendicular to the concrete surface during testing.
  • Avoid testing areas with surface coatings, paint, or other materials that could affect the rebound measurement.
  • If you continue to experience issues, consult the manufacturer’s manual or seek assistance from a qualified technician.

9. Best Practices: To ensure the accuracy and reliability of your rebound test results, consider these best practices:

  • Conduct tests at various locations on the concrete surface, especially in areas where variations in concrete quality are suspected.
  • Maintain a testing log that includes details like the test location, date, time, operator, and any unusual conditions observed during testing.
  • Perform regular maintenance and calibration to keep the rebound test hammer in optimal working condition.
  • Follow established standards and guidelines for rebound testing, such as those provided by ASTM International or relevant national standards.

10. Conclusion: The rebound test hammer is a valuable tool for assessing the surface hardness and indirectly estimating the compressive strength of concrete structures. When used correctly and in conjunction with proper calibration and interpretation, it can provide valuable insights into the quality and condition of concrete elements.

Always prioritize safety during testing, and adhere to safety precautions and guidelines to minimize the risk of accidents or injuries. Regular maintenance and operator training are essential to ensure accurate and consistent results.

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