What is CLEGG Hammer?
The Clegg hammer is an equipment which provides a cost effective, fast, accurate and convenient means for measuring and controlling soil strength and consolidation levels in road construction, geotechnical investigations etc. It is also used to confirm uniform compaction of over wide areas of ground, identifying poorly compacted areas and ineffective rolling of materials.
Advantages
Benefits of
CLEGG Hammer
- Compaction can be tested at a fast pace. By simply placing the Clegg Hammer down on the ground, results are delivered within 2 seconds of every drop.
- Over 100 locations can be tested in just one hour – depending on the distance between locations.
- Testing can be done before, during and after construction to ensure proper compaction, material strength and quality assurance.
- According to peer review studied, each reading is mapped within 3m (10ft) and correlates to strength and modulus.
- Clegg Hammer gets a perfect repeatable drop every time from project to project that is 100% accurate.
- Results of the Clegg Hammer are stored on the mobile app. With a touch of a button those results can be exported and shared to wherever you choose.
- Results obtained with Clegg Hammer can be used with free mapping software to create a visual map from the GPS plotting of your testing site so stronger and weaker spots are easily viewed and stored for your records for years.
- Ergonomic Updates to the Clegg Hammer make using it easier than ever before. The new grab handle placed at the top allows for a comfortable user experience with one hand operation to relocate and perform the test. One Hand Operation allows your free hand to operate the tablet when testing.
- The Clegg Hammer comes ready for immediate use in the field with all hardware and software components provided for you on delivery so you can set up, record, and share your results with a click of a button.
How does CLEGG Hammer work.
The Clegg Hammer consists of a compaction hammer operating within a vertical guide tube. When the hammer is released from a fixed height it falls through the tube and strikes the surface under test, decelerating at a rate determined by the stiffness of the material within the region of impact. A precision accelerometer mounted on the hammer feeds its output to a hand-held digital readout unit which registers the hammer deceleration in units of Impact Value (IV). The IV is an indication of soil strength. The Clegg Impact Value (CIV) is the unit of impact which could be converted to Resilient Modulus (MPa) or California Bearing Ratio (CBR).
Mpa = 0.088(CIV)2
CBR = 0.1691 (CIV)1.695