Asphalt Pavements the · basic principles of good compaction understand all the variables know the...

transcript

ROCKY MOUNTAIN

CONFERENCE

EQUIPMENT

ASPHALT

Thursday, April 19, 2012

Asphalt Pavements

Flexible

Asphalt Pavements

FlexibleSolution

COMPACTION TOUGH MIXES DIFFICULT CONDITIONS THIN LIFTS THICK LIFTS YIELDING SUBGRADE COLD AMBIENT TEMPERATURE LACK OF BEST PRACTICE IMPROPER ROLLERS

COMPACTIONBEST

PRACTICECHUCK DEAHL

BOMAG AMERICAS,INCchuck.deahl@bomag.com

BEST PRACTICEKNOW THE SPECIFICATIONS

KNOW THE OPERATION OF THE ROLLERS

BALANCE Thursday, April 19, 2012

COMMUNICATION COMPACTION GOALS

DENSITYSMOOTHNESSBALANCED PRODUCTION

IMPORTANCE OF COMPACTION

IMPROVE MECHANICAL STABILITY

IMPROVE RESISTANCE TO PERMANENT DEFORMATION

REDUCE MOISTURE PENETRATION

IMPROVE FATIGUE RESISTANCE

4 FORCES OF COMPACTION

PRESSURE: A DOWNWARD FORCEIMPACT: A HAMMER BLOWVIBRATION: A RAPID SERIES OF

IMPACT BLOWS MANIPULATION: KNEADING IN A

CONFINED MANNER

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

NEEDED FOR COMPACTION

CORRECT MIX TEMPERATURE

CONFINMENT

3 PHASES OF ROLLINGBREAKDOWNINTERMEDIATEFINISH

3 PHASES OF ROLLING

EACH PHASE OF ROLLING IS:

A TIME,DISTANCE, AND TEMPERATURE ZONE

Temperature

150.00

175.00

200.00

225.00

250.00

275.00

300.00

0 10 20 30 40 50 60

Time, minutes

80OF Surface & Air Temperature, 5 mph wind

1.5” 2”3”

150.00

175.00

200.00

225.00

250.00

275.00

300.00

0 10 20 30 40 50 60

Time, minutes

50OF Surface & Air Temperature, 5 mph wind

Temperature

1.5” 2” 3”

150.00

175.00

200.00

225.00

250.00

275.00

300.00

0 10 20 30 40 50 60

Time, minutes

30OF Surface, 40OF Air Temperature, 15 mph wind

Temperature

1.5” 2” 3”

LOWHIGH

THINTHICK

Base Temperature

Mix Temperature

Major Factors Affecting Rolling Time

Mat Thickness

allows LESS time

allows MORE time

November 10,

November 9, 2010Bradford County, PA

19mm .3<3 25% RAP…WMA with Foam.Air temp = 42°F

Extended 2010 Season Compaction

Spread of results of 233 Spread of results of 65

Warm mix allows for extended season

paving…January 10th to

January 11, 2011

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

Rolling

Compaction

- 15 cm overlap- reversing on same track- roller offset on already cool mix - even No. of passes

with confined edge

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

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

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.

COMPACTION BY VIBRATION

WE REARRANGE THE AGGREGATE

WE REARRANGE THE AGGREGATE WE LOCK UP THE AGGREGATE

STRUCTURE

STRUCTURE WE LEAVE IMPACT MARKS IN THE HMA MAT

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

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.

Smoothness

Frequency

Smoothness

Frequency & Travel Speed

VIBRATORY IMPACTS PER FOOT IPFMAINTAIN BETWEEN 10-14 IPF

IPF GIVES US DENSITY, SMOOTHNESS, AND BALANCED PRODUCTION

TRAVEL SPEED OF ROLLERS

DOUBLE DRUM VIBRATORY 2-4 MPHPNEUMATIC ROLLER 2-3 MPHSTATIC STEEL WHEEL ROLLER 3-5 MPH

SPEED CAN KILL

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

N/m²],

EvibSurface temp.

Core temp.

Troxler density

Excellent Operator

Great Equipment

Straight edges

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

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

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%

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%

BEST PRACTICE FOR COMPACTING WARM AND HOT MIX

ASPHALT

YES WE CAN

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

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

Thank - you

Asphalt Pavements the · basic principles of good compaction understand all the variables know the...

Documents