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Cracking Group Experiment 2018 NCAT Test Track Conference Randy West
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Page 1: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Cracking Group Experiment

2018 NCAT Test Track Conference

Randy West

Page 2: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Deficiencies of Volumetric-Based Mix Design and QA Tests

• Volumetricpropertiesonlyindicatethequantityofeffectivebinder,notthequality.

• VMAishighlydependentonGsb,whichhaspoorprecisionandistimeconsumingtodetermine.

• Effectsofrecycledmaterialsandmodifiersarenotadequatelyassessed.

2

Page 3: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

A New Era of Mix Design and QA

3

Balanced Mix DesignCrackingResistance RuttingResistance

Page 4: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Modes of Cracking

4

Fatigue ThermalTop-Down Reflection Block

Load RelatedEnvironment Related

Page 5: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

MnROAD + NCAT Partnership

5

Workingtogetheronnationalneedresearchprojects1. Validatingcrackingtestsforbalancedmixdesign2. Documentingthelifecyclebenefitsofpavement

preservation

Page 6: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

MnROAD + NCAT Partnership

6

NCATTestTrackTop-downcracking

MnROADLow-temperaturecracking

Page 7: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

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NCAT Cracking Group Test Sections

Page 8: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Test Sections

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CrackingGroupsections• 7200-ft.sections• Eachsectioninstrumented

Surface Layer 1.5”

IntermediateLayer 2.25”

BaseLayer 2.25”

Granularbase 6”

Stifftracksubgrade infinite

HiMAmix

Page 9: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

9

1Cycle,10MESALs

Section DescriptionRutting(mm)

Δ IRI(in/mi.)

Δ MTD(mm)

Cracking(%oflane)

N1 20%RAP(Control) 1.7 3 0.4 21.5

N2 Controlw/High Density 2.2 7 0.5 6.2

N5 Low AC,LowDensity 1.2 5 0.4 5.0

N8 20%RAP,5%RAS 1.2 13 0.7 16.9

S5 35%RAP,PG58-28 1.5 1 0.5 0

S6 ControlwHiMA 1.4 10 0.6 0

S13 AZ RubberMix 2.8 3 0.1 0

Page 10: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

10

1Cycle,10MESALs

0%

5%

10%

15%

20%

25%

30%

0 2 4 6 8 10

TotalCracking(%

ofLan

eArea)

ESALs(Millions)

N1ControlN8Control+5%RASN2Control,HighDensityN5Control,LowDensity,LowAC

Page 11: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

11

N1Control,Core#2

N1Control,Core#1

Page 12: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

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N2HighDensity,Core#2

N2HighDensity,Core#1

Page 13: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

13

N5LowAC,LowDensity,Core#1

N5LowAC,LowDensity,Core#2

Page 14: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Field Performance

14

N8Control+5%RAS,Core#1

N8Control+5%RAS,Core#2

Page 15: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

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SubgradePressureMeasurements

Page 16: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

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SubgradePressureNormalizedto68FversusTime

Page 17: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

17BasePressureMeasurements

Page 18: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

18BasePressureNormalizedto68FversusTime

Page 19: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

19

BackcalculatedACModulusNormalizedto68FversusTime

Page 20: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

NCAT CG Response Analyses

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N1, Control

ACModulusNormalizedto68FbyWheelpathversusTime

N8, Control+5%RAS

Inside Wheelpath Inside WheelpathOutside Wheelpath Outside Wheelpath

Page 21: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Selected Cracking Tests

21

SCB-LAEnergyRatio OT-NCATIFIT OT-TX

Alltestswereconductedonbothlabmixandplantmixsamplesthatwereshort-termandcriticallyaged.

IDEAL-CT

ResultsandanalyseswillbepresentedThursdayat8:00AMbyAdamTaylor

Page 22: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

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MnROAD Cracking Group Test Sections

Page 23: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

16

17

23

22

21

20

19

18

MnROADTestSections

CrackingGroupCells16-23

Page 24: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Asphalt MixturesCELLNO BINDERGRADE ABR% RAS

16

64S-22

30-40 Yes17 20-30 Yes18

15-25 No1920 52S-34 25-35 No21

58H-34 15-25 No221

23 64E-342 10-20 No

Allmixesare12.5mmNMASAllmixesareNdes =80andtargetairvoids=4.0%exceptcell19,whichhasNdes =100andtargetairvoids=3.0%1 Cell22limestoneaggregateinmix2 Highlymodifiedasphaltbinder

Page 25: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Cracking Modes and Testing

• Typesofcrackinginvestigated▻ Lowtemperature▻ Top-downorbottom-upfatiguepossible

• PMLCtesting▻ Lowtemp:DCT-MNandIDTCreep▻ Intermediatetemp:IFIT,OT,BBF▻ E*,TSR,Hamburg

• Samplesprovidedtootherresearchstudies

Page 26: Cracking Group ExperimentValidating cracking tests for balanced mix design 2. Documenting the life cycle benefits of pavement preservation. MnROAD + NCAT Partnership 6 NCAT Test Track

Anyquestions?Reachmeat

[email protected]

THANKS!

2018 NCAT Test Track Conference


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