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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