Download - Equipment Hamm
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HAMM ROLLER SUMMARY
Nebraska DOT
Hamm Oscillation Review
February 2012
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Introduced by HAMM in 1983
28 years of continuous development
Benefits of Oscillation
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Europe Had a Serious Need for Non-Aggressive Compaction
Benefits of Oscillation
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By 2001 ~ 80% of Hamm tandem roller sales in Europe were oscillatory rollers
Benefits of Oscillation
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So why bring it to the U.S.?
European style mixes are prevalent
The industry has changed and grain crushing,achieving bonus and avoiding penalties are ahuge issue
Joint construction is poor and usually the first
area to failTAC (time available for compaction) is critical temperature sensitive
Contractors want solutions!
Benefits of Oscillation
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Introduced into the U.S. (South Carolina) in 2002
Tested as a breakdown roller No
significant benefit was realized
Benefits of Oscillation
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Conventional Vibration
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Oscillation
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1 Setting: On/Off
Oscillation
Handling
Oscillation
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soft stiff
Self-adjusting amplitude
Oscillation
Handling
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Vibration Oszillation
Benefits of Oscillation
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CO DOT introduced a cold joint density requirement of88% on state work
18 months after implementation, not a single contractorhad been able to achieve the joint density spec and werefactoring in penalty costs to the job
Brannon S&G using the Hamm HD O90V was able to
consistently achieve joint density between 89% - 91%
CO DOT continues to enforce the specification andpromote the ozzi as the contractors solution
No damage Cold Joints
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Vibration
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Better Consistency
across full width of mat
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Why is this so?
! With constant Vibration the material
will eventually give.
! With constant Oscillation the drum
will eventually give.
! If the mat can be squeezed the
Oscillation drum will continue to work.
! If the mat is fully compacted the
Oscillation drum will scuff but notcause damage to the mat.
! The end result is consistent density
numbers across the width of the mat.
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Changes to PA Turnpike Manual
Specifications revised in Section 401 and 409
Use vibratory rollers only when permitted by the
representative and only to compact authorized lifts ofbituminous concrete base course material or authorized
lifts of binder course material 3 inches or greater in
depth.
Oscillatory rollers that do not impact will bepermitted as intermediate or finish rollers for all
courses
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Oscillation
Oscillation Effects in the Mat
When horizontal compaction is complete, vertical compaction continues
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Oscillation
Oscillation Effects in the Mat
When vertical compaction is complete, horizontal compaction continues
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Make it or Break it The Ozzi Zone
Paver screed
75 to 82%
The Common Solution
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Oscillation summary
You cannot over compact better quality
No chatter marks better quality
No vibration to environment and machine better quality
No damage to cold joints - better quality
Ability to work effectively on cooler mixes - better quality
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LARGE HD SERIES
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HD+
Hydraulic offset to either side
! Improved from 3.9 to 6.7 either side.
!
Big enough to pinch a joint.
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A reminder - if you dont
use Oscillation!