NCHRP 40-13 Recycling and Reclamation of Asphalt Pavements Using - - PowerPoint PPT Presentation

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NCHRP 40-13 Recycling and Reclamation of Asphalt Pavements Using In-Place Methods 2/4/2010 Kansas 1 Key Issues Extent of annual program Project selection criteria Materials Liquids and stabilizers Design methods

SLIDE 1

NCHRP 40-13

Recycling and Reclamation of Asphalt Pavements Using In-Place Methods

2/4/2010 1 Kansas

SLIDE 2

Key Issues

 Extent of annual program  Project selection criteria  Materials

Liquids and stabilizers
Design methods
Processing methods and equipment
QA/QC
Wearing course

 Barriers  Environmental benefits

2/4/2010 2 Kansas

SLIDE 3

In-Place Methods Considered

 Hot In-Place (HIR)  Cold In-Place (CIR)  Full Depth Reclamation (FDR)  Why one instead of the other?  Case studies  Gaps in knowledge and research  Structural coefficients?

2/4/2010 3 Kansas

SLIDE 4

This Presentation

 Extent of Annual Program  Project Selection Criteria  Wear Courses  Specifications

2/4/2010 4 Kansas

SLIDE 5

25 50 75 100 Responses, % Years State Agency Contractor

Years of Experience

2/4/2010 5

HIR CIR FDR

Kansas

SLIDE 6

25 50 75 100 Responses, % Lane Miles State Agency Contractor

Annual Lane Miles

2/4/2010 6

HIR CIR FDR

Kansas

SLIDE 7

Project Selection Criteria

Survey Results

Traffic level Roadway Geometry Climate Region

2/4/2010 7 Kansas

SLIDE 8

25 50 75 100

<5K 5K-10K 10K-20K 20K-30K > 30K

Responses, %

AADT

State Agency Contractor

Traffic Levels for Recycling Method HIR

2/4/2010 8 Kansas

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Traffic Levels for Recycling Method CIR

25 50 75 100

<5K 5K-10K 10K-20K 20K-30K > 30K

Responses, % AADT State Agency Contractor

2/4/2010 9 Kansas

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Traffic Levels for Recycling Method FDR

25 50 75 100

<5K 5K-10K 10K-20K 20K-30K > 30K

Responses, % AADT State Agency Contractor

2/4/2010 10 Kansas

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Geometry HIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 11 Kansas

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Geometry CIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 12 Kansas

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Geometry FDR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 13 Kansas

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Climate HIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 14 Kansas

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Climate CIR

38 40 40 54 14 41 27 50 25 50 75 100

Responses, % State Agency Contractor

2/4/2010 15 Kansas

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Climate FDR

25 50 75 100

Responses, %

2/4/2010 16 Kansas

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Wear Courses

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Surface HIR

25 50 75 100 Responses, %

State Agency Contractor

2/4/2010 18 Kansas

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Surface CIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 19 Kansas

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Surface FDR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 20 Kansas

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Specifications

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Specifications HIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 22 Kansas

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Specifications CIR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 23 Kansas

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Specifications FDR

25 50 75 100 Responses, % State Agency Contractor

2/4/2010 24 Kansas

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Preliminary Observations

 Experience

CIR and FDR increasingly used
Contractors have more experience with CIR,

FDR than agencies

 Annual lane miles

Agencies < 50 lane miles per year per type
Contractors > 50 lane miles for CIR and

FDR

2/4/2010 25 Kansas

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Preliminary Observations

Project Selection

Traffic

 Contractors more likely to use CIR and FDR

n higher AADT
Climate

 Cold/wet or hot/wet climates

 Needs further consideration for HIR and CIR  FDR OK

Geometry

 Minor lane widening, tight turns  Mountainous terrain with grades

 CIR, FDR

2/4/2010 26 Kansas

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Preliminary Observations

 Wear Courses

Overlays preferred by agencies/contractors

for

 HIR, CIR, FDR

Contractors more likely to use other options

for CIR and FDR

 Fog and chip seal for FDR

 Specifications

Agencies mostly method specs
Contractors wider range of experience

2/4/2010 27 Kansas

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Questions ??????

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