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ROCKY MOUNTAIN
CONFERENCE
EQUIPMENT
SHOW
ASPHALT
Thursday, April 19, 2012
Thursday, April 19, 2012
Asphalt Pavements
the
Thursday, April 19, 2012
Asphalt Pavements
the
Flexible
Thursday, April 19, 2012
Asphalt Pavements
the
FlexibleSolution
Thursday, April 19, 2012
COMPACTION TOUGH MIXES DIFFICULT CONDITIONS THIN LIFTS THICK LIFTS YIELDING SUBGRADE COLD AMBIENT TEMPERATURE LACK OF BEST PRACTICE IMPROPER ROLLERS
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COMPACTIONBEST
PRACTICECHUCK DEAHL
BOMAG AMERICAS,INCchuck.deahl@bomag.com
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BEST PRACTICEKNOW THE SPECIFICATIONS
KNOW THE OPERATION OF THE ROLLERS
BALANCE Thursday, April 19, 2012
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COMMUNICATION COMPACTION GOALS
DENSITYSMOOTHNESSBALANCED PRODUCTION
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IMPORTANCE OF COMPACTION
IMPROVE MECHANICAL STABILITY
IMPROVE RESISTANCE TO PERMANENT DEFORMATION
REDUCE MOISTURE PENETRATION
IMPROVE FATIGUE RESISTANCE
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4 FORCES OF COMPACTION
PRESSURE: A DOWNWARD FORCEIMPACT: A HAMMER BLOWVIBRATION: A RAPID SERIES OF
IMPACT BLOWS MANIPULATION: KNEADING IN A
CONFINED MANNER
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FACTORS AFFECTING COMPACTION
MIX DESIGN AGGREGATE AND ASPHALT CEMENT LAB DENSITY & FIELD DENSITY CLIMATIC CONDITIONS PAVER TYPE AND PAVING METHOD TEMPERATURE: MAT, BASE AMBIENT,
DIRECTION OF SUN; WIND
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NEEDED FOR COMPACTION
CORRECT MIX TEMPERATURE
CONFINMENT
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3 PHASES OF ROLLINGBREAKDOWNINTERMEDIATEFINISH
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3 PHASES OF ROLLING
EACH PHASE OF ROLLING IS:
A TIME,DISTANCE, AND TEMPERATURE ZONE
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Temperature
150.00
175.00
200.00
225.00
250.00
275.00
300.00
0 10 20 30 40 50 60
Tem
pera
ture
, F
Time, minutes
80OF Surface & Air Temperature, 5 mph wind
1.5” 2”3”
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150.00
175.00
200.00
225.00
250.00
275.00
300.00
0 10 20 30 40 50 60
Tem
pera
ture
, F
Time, minutes
50OF Surface & Air Temperature, 5 mph wind
Temperature
1.5” 2” 3”
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150.00
175.00
200.00
225.00
250.00
275.00
300.00
0 10 20 30 40 50 60
Tem
pera
ture
, F
Time, minutes
30OF Surface, 40OF Air Temperature, 15 mph wind
Temperature
1.5” 2” 3”
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LOWHIGH
LOWHIGH
THINTHICK
Base Temperature
Mix Temperature
Major Factors Affecting Rolling Time
Mat Thickness
allows LESS time
allows MORE time
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November 10,
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November 9, 2010Bradford County, PA
19mm .3<3 25% RAP…WMA with Foam.Air temp = 42°F
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Extended 2010 Season Compaction
Spread of results of 233 Spread of results of 65
cores
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Warm mix allows for extended season
paving…January 10th to
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January 11, 2011
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January 11, 2011
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ULTIMATE SMOOTHNESS ONE DRUM VIBRATING IN
HORIZONTAL VIBRATION DIRECTION---FRONT DRUM
REAR DRUM SHUT OFF 13/4INCH LOOSE LIFT 2PASSES-
DENSITY 93.7% MTD SMOOTHNESS 38.5-42.0 IRI
MEASURED WITH A LAZER MOUNTED VEHICLE
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Rolling
Compaction
- 15 cm overlap- reversing on same track- roller offset on already cool mix - even No. of passes
with confined edge
Thursday, April 19, 2012
Rolling
Compaction
- 15 cm overlap- reversing on same track- roller offset on already cool mix - even No. of passes
finished with a slight radius
with confined edge
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PNEUMATIC TIRE RULES
INFLATE ALL TIRES TO EQUAL PRESSURE LOOK AT TIRE INFLATION CHART
GET TIRES CLEANGET TIRES HOT BEFORE
GETTING ON THE MATUSE GOOD RELEASE AGENT
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PNEUMATIC TIRE RULES
ON NEAT ASPHALT USE WATER SPRAY ON INTERMITTENT LOW
RUN ROLLER BETWEEN 190F-225F
ON MODIFIED ASPHALT USE WATER SPRAY ALL THE TIME
RUN THE ROLLER BETWEEN 185F-212F ALL TEMPERATURES ARE SURFACE TEMPS.
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COMPACTION BY VIBRATION
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COMPACTION BY VIBRATION
WE REARRANGE THE AGGREGATE
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COMPACTION BY VIBRATION
WE REARRANGE THE AGGREGATE WE LOCK UP THE AGGREGATE
STRUCTURE
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COMPACTION BY VIBRATION
WE REARRANGE THE AGGREGATE WE LOCK UP THE AGGREGATE
STRUCTURE WE LEAVE IMPACT MARKS IN THE HMA MAT
Thursday, April 19, 2012
COMPACTION BY VIBRATION
WE REARRANGE THE AGGREGATE WE LOCK UP THE AGGREGATE
STRUCTURE WE LEAVE IMPACT MARKS IN THE HMA MAT WE CONTROL THE SPACING OF THESE
IMPACT MARKS, SO YOU WILL NOT SEE OR FEEL THEM, BY MATCHING- TRAVEL SPEED & FREQUENCY
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SYSTEMS ON VIBRATORY ROLLERS
AMPLITUDE: THE HEIGHT THE VIBRATING MASS MOVES FROM THE MATERIAL BEING COMPACTED-IN ONE ROTATION OF THE VIBRATING MASS.
FREQUENCY: THE NUMBER OF TIMES THE VIBRATING MASS MOVES IN A MINUTE- VIBRATIONS PER MINUTE OR V.P.M.
FREQUENCY AND AMPLITUDE CREATE A GIVEN AMOUNT OF CENTRIFUGAL FORCE.
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Smoothness
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Smoothness
Frequency
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Smoothness
Frequency & Travel Speed
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VIBRATORY IMPACTS PER FOOT IPFMAINTAIN BETWEEN 10-14 IPF
IPF GIVES US DENSITY, SMOOTHNESS, AND BALANCED PRODUCTION
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TRAVEL SPEED OF ROLLERS
DOUBLE DRUM VIBRATORY 2-4 MPHPNEUMATIC ROLLER 2-3 MPHSTATIC STEEL WHEEL ROLLER 3-5 MPH
SPEED CAN KILL
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EVIB and Density as function of passes; BW 174 AD Asphalt Manager, Automatic mode; Asphalt Base 0/32 CS B65, Nürnberg A3
4 cm SMA 0/11 S8 cm Binder 0/22> 10 cm ATS 0/32
100120140160180200220240260280
0 1 2 3 4 5 68486889092949698100102
[%]
Passes
EVI
B [M
N/m²],
[°
C]
EvibSurface temp.
Core temp.
Troxler density
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Excellent Operator
Great Equipment
Straight edges
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2011 “normal season”…
NAPA Quality in Construction
Award Winning Project
SR 22/322 Juniata
First pass to paver – stay
off joint;then coming
back – compact
joint.Thursday, April 19, 2012
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WARM MIX ASPHALT COMPACTION
MIX DESIGN: PG 82-22, POLYMER MODIFIED WARM MIX PROCESS: SASOBIT ADDED AT
THE PLANT JOB LAYOUT: PAVING WIDTH 12’, PAVING
SPEED 25 FEET/MIN., LIFT THICKNESS 21/2 INCH LOOSE
TEMPERATURES: MIXING TEMP. 315 F LAYDOWN TEMP OFF THE SCREED 287-305F
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WARM MIX JOB ROLLING PROCEDURES, TEMPERATURE ZONES, # OF PASSES,
LENGTH OF ROLLING ZONES, DENSITY BREAKDOWN ZONE 66” DOUBLE DRUM
VIBRATORY 3000vpm DISTANCE OF ZONE 150’ TEMPERATURE IN ZONE 287-305 F ROLLING PATTERN 5 PASS PATTERN DENSITY ACHIEVED 90%-92%
INTERMEDIATE ZONE 66” DOUBLE DRUM VIBRAYORY 3000vpm DISTANCE OF ZONE 150’ TEMPERATURE IN ZONE 200FROLLING PATTERN 5 PASS PATTERN DENSITY ACHIEVED 92.4%-94.3%
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WARM MIX ROLLING PROCEDURES
FINISH ROLLING 66” DOUBLE DRUM OSCILLATING DRUM ROLLER VIBRATE IN STATIC OUT 5 PASS PATTERN 200’ ROLLING ZONE DENSITY ACHIEVED 94.7%-95.6%
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BEST PRACTICE FOR COMPACTING WARM AND HOT MIX
ASPHALT
YES WE CAN
Thursday, April 19, 2012
CONCLUSIONS:COMPACTION OF WARM MIX AND
HOT MIX ASPHALT FOLLOW BASIC BEST PRACTICE
WARM MIX, DEPENDING ON MIX DESIGN HAS BEEN EASIER TO COMPACT-----AND WE HAVE REDUCED THE # OF ROLLERS, BUT THIS IS THE EXCEPTION
Thursday, April 19, 2012
BASIC PRINCIPLES OF GOOD COMPACTION
UNDERSTAND ALL THE VARIABLESKNOW THE SPECS; KNOW THE JOB LAYOUTESTABLISH A PATTERN TO ACHIEVE:
COVERAGE, DENSITY, SMOOTHNESS, AND BALANCED PRODUCTION
KNOW THE BASIC OPERATION OF EACH TYPE OF ROLLER
TRAIN AND COMMUNICATE EVERY DAY
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Thank - you
!
Thursday, April 19, 2012
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