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GIT Impact Tester

Geo Impact Tester

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Clegg type Impact Testers are the recognised testing device for compaction testing of roading, providing CIV readings (Clegg Impact Value).

The Geotechnics Impact Tester (GIT) has been designed and built to conform with ASTM D5874 Test Method for Determination of the Impact Value (IV).

An alternative to the Clegg model, the GIT works on the principle of a known mass falling a known distance.
This results in the same impact energy on each drop. The hammers reaction to the rebound is recorded on a digital readout on a scale of 0-100 IV (impact value).

Typical values would be around 30 - 50 IV for sub base materials, and up to 80 or more for base course layers on Transit highways.

By working from a design CBR, the user can calculate a target IV for the material. This helps to fine tune the compaction process.

The GIT tube is constructed from plastic and features an ergonomic built in handle for easy of transport during operation.

The simple easy to use LCD controller is attached to the top of the GIT, and features a single button for measuring.



construction, operation & readout


Construction:
1. PVC Plastic tube
2. Fixed LCD reader
GIT display

Geo Impact Tester display
  Display on screen
1. Impact value (IV)


Principally regarding CIV obtained using the Standard 4.5 kg Clegg Hammer

For Pavement Design - CIV is similar in concept to the California Bearing Ratio (CBR). CIV may be used as an alternative to CBR in both laboratory and field on un soaked samples. CIV may be converted to a Clegg Hammer Modulus (CHM), analogous to an elastic modulus.

For Construction - CIV provides a means of process control by monitoring the effect of roller passes and checking variability. Percent compaction may be estimated by determining the CIV (termed an "As Compact Target CIV") needed to achieve the desired density level for the given material and field moisture content.

For Evaluation - CIV may be used to ensure adequate base course strength before sealing or proceeding with subsequent layers. It may also be used to monitor the effect of environmental changes and to investigate pavement failures.

Information - Information in the form of Papers, Reports, Technical Notes, Newsletters, etc. covering the theoretical basis, applications and correlation with other soil property tests such as "Proctor Density", Texas Class Number (TCN), Benkelman Beam, California Bearing Ratio (CBR), Falling Weight Deflectometer (FWD) and Modulus (Youngs or elastic Modulus) are available.

ASTM Standard for Impact Value (CIV)
D5874 - Standard Test Method for Determination of the Impact Value (IV).



calibration & certification

It is recommended that the Geo impact tester undergoes calibration testing and certification at least once a year.
This does not take into account whether calibration and servicing are required as a result of mistreatment of the instrument, circumstances or mishap that lead to damage, obvious or not, and so owners/operators need to take this into account too rather than simply abiding by the suggested period regardless of anything else.

approved dealer

Geotechnics

Accurate Instruments (NZ) Ltd are an approved sales agent for the sale of the Geo Impact Tester throughout New Zealand.


Standard package includes:

GIT 4.5kg hammer & handle, plastic guide tube with locating pin & chain, digital readout unit, 2x connecting cables, operational check ring, instruction manual, test calibration certificate, hard carry case.
Geo Impact Tester package

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