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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Impact Soil Tester Material Testing

Impact Soil Tester

Product Code:Clegg

Need more Info? (514) 354-2511 - 1-800-463-4363

Dynamic Test
The basic principle behind the Clegg Impact Soil Tester is to obtain a measurement of the deceleration of a free falling mass (hammer) from a set height onto a surface under the device. The impact of the hammer produces an electrical pulse, which is converted into a Clegg Impact Value (CIV).

Four successive blows of the hammer on the same spot constitues one test with the peak CIV output to the digital display. The CIV is displayed in units of tens of gravities. This value correlates to the California Bearing Ratio, Texas Class Number, Elastic Modulus, and PSI. Reference ASTM test methods D5874 and F1702.

The Clegg offers the convenience of rapidly scanning compaction variation over large areas. In research studies, 250 tests were performed with the Clegg in a half-day.


The Clegg is constructed to be extremely durable and easy to operate. The hammer has a hardened strike face, and comes in weights of 0.5 kg, 2.25 kg, 4.5 kg, and 20 kg. The guide tube is metal and will give you years of reliable, accurate service. The control box features a digital display and is powered by a standard 9V battery. During operation, the control box may be hand held or mounted to the guide tube.


Simple and quick test procedure
The test procedure is very rapid and can easily be performed by site personnel with minimal training. Each test can be completed in less than 30 sec. The results are immediate.

  • Select a level surface (If needed, lightly scuffing surface with a foot to level the strike area)
  • The guide tube is set into position, secure by placing a foot on the tube's basee flange and steadied with the lower leg and knee)
  • The ON/RESET button on the control box is pressed and release to activate the circuitry. The hamer is raised to the drop height indicator mark
  • The hammer is released allowing it to fall freely and cleanly
  • Without moving the guide tube or pressing the ON/RESET button, the Hammer is raised o the mark and release three more times
  • The value (CIV) dsplayed after the fourth blow is recorded and the display automatically powers down 30 sec. after activation
  • Move to the next test site.


The Clegg may be transported and operated by one person, allowing for low cost, rapid field and laboratory testing and direct readout of the test results. The Clegg can test a full range of soil and stone as encountered in the construction of flexible pavement and earthworks. It is useful for quickly checking variations during construction and monitoring changes over time due to seasonal environmental changes or road traffic as well as testing natural and "as constructed" conditins. The Clegg can test a full range of natural and artificial athletic surfaces where hardness/impact characterisstics need to be controlled for safety or playability.


Cat. No. Description
LA95048A-0 0.5 kg Clegg, for soft turf, sans and golf greens
LA95049A-0 2.25 kg Clegg, for natural or artificial turf (football, baseball, and soccer fields - playgrounds, horse tracks)
LA95050A-0 4.5 kg Clegg, for preconstructed soils, trench reinstatement, bell holes, foundations
LA95056A-0 20kg Clegg, for flexible pavement, aggregate road beds, trench reinstatement, bell holes, foundations


Convertisseur d'unités