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6/29/2012
1
COLD IN PLACE RECYCLING
Sponsored by LADA of New York OVERVIEWWhat is Cold Recycling?Why Recycle?Types & Processes Candidate SelectionCore SamplingMix Design Economics
WHAT IS COLD RECYCLING?Effective Road Rehabilitation Technique
Removal or Reduction of Distress & FatiguePavement Only (CRBC)Pavement & Sub-base (Stabilization)
Economically Attractive Alternative to HMARe-use of Existing Materials
Typically 80-100%Addition of Coarse Aggregate (Optional)Addition of Emulsion AdditiveEnvironmentally Friendly
WHY COLD IN-PLACE RECYCLE?Improve Pavement profile, section, and structure in one operationBreaks up the Cracking pattern
cracks won’t come back as soonEliminates existing ruts, potholes, utility cuts, etc.Flexibility of Cold Recycle BC
More forgiving over marginal basesWithstands movement from freeze thaw cycles
WHY RECYCLE ?
CORRECT PAVEMENT DEFECTS
REUSE VALUABLE RESOURCES
WHY COLD IN-PLACE RECYCLE?
Conserves EnergyEntire process is done coldReduces hauling requirementsReuses valuable natural resources
Typically 80-100% RAP
Dramatic Cost Savings Over HMAPotential 20-40%
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WHY COLD IN-PLACE RECYCLE?
Less Disruption of TrafficCan process entire traffic lane and shoulder in one passConstruction done under trafficConstruction done quickly (up to 2 lane miles/day) reducing exposure time
Approx. 3000 -3600 ton /day
RECYCLING TECHNIQUES
SINGLE UNIT TRAINGRINDER / MIXERPAVER
MULTI-UNIT TRAINGRINDERSCREEN / CRUSHERMIXERPAVER
RECYCLING TECHNIQUES
CENTRAL PLANT-GRINDER
-SCREEN / CRUSHER ( OPTIONAL)-PUGMILL-PAVER
CENTRAL PLANT
CANDIDATE SELECTIONCORE SAMPLING
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MIX DESIGN
Not Yet
MIX DESIGN
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EQUIPMENTSTONE BOX / AGGREGATE SPREADERMILLING MACHINE
MILL & MIXPAVER
AUTOMATED w/ PICKUP ELEVATORROLLERS
VIBRATORY ( 10 – 12 TON DUAL DRUM )PNEUMATIC ( 20 – 30 TON STATIC or VIBRATORY equivalent)VIBRATORY FINISH (10 – 20 TON IN STATIC MODE)
Single Unit Train
SINGLE UNIT TRAIN WITH ATTACHED PAVER
Multi-Unit Train
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Single Unit Train
PROJECT INSPECTIONCHECK MIX DESIGNADD STONE
PROPER TYPEPROPER AMOUNT
EMULSION / PG BINDERPROPER TYPEPROPER AMOUNT
DEPTH OF CUTCHECK DEPTH AND CROSS SLOPE
INSPECTION (CONT.)MIXING
COATINGSEGREGATION
LAYDOWNDEPTHCROSS SLOPE
COMPACTIONROLLING PATTERN
TEST STRIP
FOG SEAL AMOUNT/TYPE
PLACING ADDITIONAL AGGREGATE
Remove Aggregate from a known areaPlace in a Container and weigh--Measure Aggregate depth
LADA
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LADA
AUTOMATION
Grinding Mixing
CuringCHECK FOR DEPTH AND CROSS SLOPE
Mixing and curing
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Mixing and curing
Mixing and curing
GRADE AND COMPACTION
2% Mat
2% Cut
IDEAL ROAD PROJECT
GRADE AND COMPACTION
2% Pavement
2% Cut
EASIEST COMPACTION
GRADE AND COMPACTION
3% Mat
3% Cut
GRADE AND COMPACTION
2% Pavement
3% Cut
1% Wedge extra material
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Mixing & Curing
PROJECT INSPECTION
Mixing
PROJECT INSPECTION
LADA
CENTRAL MIX SET UP
LADA
DENSITY MONITORING
Daily test strip to establish a roller pattern, the routine monitoring throughout the day.
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LADA
FOG SEALWHEN TO FOG SEAL
WHEN SURFACE IS OVERLY DRYCOOL TEMPERATURES
Shaded areas
WHEN RAVELING OCCURSIn curvesCenter joint
PRIOR TO SEAL COAT OR MICROSURFACEMix is hungry- will pull oil from thin top courses
FOG SEAL
THIN APPLICATION OF TACK COAT LIKE EMULSION
TYPICAL RATE---0.05G/SQ.YD -0.15 GAL/SQ.YDTHEN A LIGHT APPLICATION OF SAND
TYPICAL RATE---2#/SQ.YD –5#/SQ.YDTIGHTENS SURFACE
SLOWS RAVELING
LADA
Fog and Sand Seal
CURING
ALLOW RECYCLE MIX TO CURE FOR SEVEN DAYS (MINIMUM) BEFORE APPLYING SURFACE COURSE
Moisture Content < 2 - 3% at some pointLonger = Better
LADA
OVERLAY / SURFACE TREATMENT AFTER CURING
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RECYCLING
WHEN FINISHED = IMPROVED:RIDE - PROFILECROSS SLOPESTRUCTURAL CAPACITY
Pavement section only
QUESTIONS
THANK YOU
THE END
LADA