ASTM D5874 Impact Soil Tester
The Clegg Hammer: The Fastest Way to Measure Pavement Strength
Test soil compaction and pavement strength in 2 seconds per drop. One person, one hand, over 100 GPS-mapped locations an hour, with everything included in one purchase.
100+
tests per hour, one operator
2 sec
to a result per drop
3 m
GPS mapping accuracy (10 ft)
140+
countries recognize ASTM
Fast, Accurate, Convenient Pavement Testing
Light, portable and robust, the Clegg Hammer delivers immediate compaction results on all kinds of pavements and soils.
1 - Speed
Place it down and read the result within 2 seconds. Test before, during and after construction for compaction and material strength quality assurance.
2 - Accuracy
A repeatable drop every time, project to project and operator to operator, built to ASTM D5874 and correlated to strength and modulus in peer-reviewed studies.
3 - Convenient Reportability
Results save to the app with GPS coordinates, then export and share with one tap, or plot on a map with free mapping software.
How the Clegg Hammer Works
1 - Place
Set the hammer on the surface. A top grab handle allows one-hand relocation, and there is no locking pin.
2 - Drop
Release the standard 4.5 kg hammer. The impact is measured and the Clegg Impact Value appears in seconds.
3 - Map & Share
Each drop is GPS-tagged on the tablet. Export the report and see strong and weak spots across the site.
Clegg Control App: Test, Map, Report
A large sampling size gives a complete picture of the project compared to traditional spot testing. One person can cover a mile of pavement on foot in under 90 minutes.
GPS coordinates assigned to every drop
Results stored on the mobile app
One-touch export and sharing
Export file ready for use with free mapping software for strength heat maps
Industries That Test With the Clegg Hammer
Roads & Highways
Base, subbase and subgrade compaction control.
Rail
Trackbed and formation strength checks.
Airfields & Ports
Heavy-load pavement verification.
Geotechnical & Service
Dense data for reporting and CBR correlation.
Standards
Built to ASTM D5874
Meets global ASTM standards with confidence that is recognized and respected in over 140 countries.
“The Clegg Hammer is the best and most cost efficient tool there is to measure road strength.”
-Brian Jackman, Claycrete Global
All in One Purchase: What's Included
Everything arrives ready for immediate field use.
GPS-enabled tablet and protective case with lanyard
Recharging cord and global plug set
Silicone calibrating disc and bench calibration certificate
Custom aluminum carrying case with wheels for easy transport
Clegg Hammer FAQs
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A portable impact soil tester that measures the strength and compaction of soils and pavement layers, following ASTM D5874.
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Results appear within 2 seconds of every drop, and one person can test over 100 locations per hour depending on spacing.
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ASTM D5874, recognized in over 140 countries.
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Readings correlate to strength and modulus according to peer-reviewed studies. See our CBR Correlation and Clegg Modulus guides.
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Tablet with case and lanyard, charger and global set of plugs, calibrating disc and certificate, and custom aluminum carrying case.
Get a Clegg Hammer Quote
Tell us about your project and we will show how the Clegg Hammer fits your needs and budget.