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By Robert J. BlightProject Engineer
Bureau of Materials
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Remove Deteriorated and Distresses Pavement (to a specified depth)
Improve Cross-Slope Achieve Specified Grades Provide a Uniform Surface Texture to
Facilitate Compaction of HMA Provide Best Opportunity for Achieving the
Ride Quality Requirement
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Excavation Maintain Overhead Clearance Correct Ponding and Drainage Maintain Curb and Gutter Staged Construction
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Need enough of cores to determine the consistency of the existing pavement
Establish the “most” reasonable milling depth
Provide thickness of the layers Determine depth of “Top Down” cracks
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Need to remove the entire layer to avoid scabbing
Need to remove reasonable amount of the deteriorated pavement
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Need to remove the entire layer to avoid scabbing
Need to remove reasonable amount of the deteriorated pavement
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For every operation (or opportunity) the IRI was expected to be improved by 30%◦ Milling = 30 % improvement of IRI◦ Each subsequent operation (each paving lift)
expected 30% improvement of of IRI
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Determination of the Target IRI is more complicated
30 % improvement is no longer used in determination of Target IRI
Many other factors involved that affect the target IRI
THE POINT IS THAT EVERY OPPORTUNITY FOR SMOOTHNESS (MILLING) IS IMPORTANT
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Equipment◦ Self-propelled with variable operating speeds
capable of removing pavement without using heat◦ Automatic grade controls◦ Stringline or ski type reference system
Ski must be minimum of 20’ length◦ Teeth should be replaced if dislodged, broken or
unevenly worn
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Construction◦ No ride quality requirement◦ Texture requirements, but they are not typically
checked Striations must be within ±1” in 200’ of line parallel
with the center of the traveled way Striations not to exceed 3/8” depth Milling depth within a tolerance of ± ¼” If opened to traffic, no drop-offs to exceed 2”
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Equipment◦ Self-propelled with variable operating speeds and
equipped with cutting drum specifically designed for milling pavement to close tolerances
◦ Drum must have 2 wraps of flighting with bolt-in blocks that accept 3 or 4 teeth on the wear side of the flight Second wrap of flighting must trail the first by 180
degrees Teeth spacing of 5/16” (±1/32”)
◦ Cutting radius of the drum within ± 1/32”
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Construction◦ No ride quality requirement◦ Texture requirement, but typically not measured
Striations must be within 5/16” center to center Striations not to exceed 1/16”
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Indiana DOT◦ Macrotexture
Requirement measured by Sand Patch Test using glass beads (ASTM 965)
◦ Not complicated◦ Data shows
improvement in HMA densities due to improved working platform
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Georgia DOT◦ Ride quality
requirement for milled pavements if traffic is allowed prior to overlay IRI < 75 in./mi. for
Interstates IRI < 85 in./mi. for all
others
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Industry has requested to allow traffic on milled surfaces
If NJDOT allows traffic, we will require “End Result” specifications◦ IRI◦ Macrotextureor◦ Combination of IRI and macrotexture
Micro-milling specification will have “End Result” requirements
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Contact Info.:Robert J. BlightProject EngineerNJDOTBureau of MaterialsPhone (609) [email protected]