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

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 ◦ Processing methods and equipment ◦ QA/QC ◦ Wearing course  Barriers  Environmental benefits 2/4/2010 Kansas 2

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 Kansas 3

This Presentation  Extent of Annual Program  Project Selection Criteria  Wear Courses  Specifications 2/4/2010 Kansas 4

Years of Experience 100 State Agency Contractor 75 Responses, % FDR HIR CIR 50 25 0 Years 2/4/2010 Kansas 5

Annual Lane Miles 100 State Agency Contractor 75 Responses, % CIR HIR FDR 50 25 0 Lane Miles 2/4/2010 Kansas 6

Project Selection Criteria Survey Results Traffic level Roadway Geometry Climate Region 2/4/2010 Kansas 7

Traffic Levels for Recycling Method HIR 100 State Agency Contractor 75 Responses, % 50 25 0 <5K 5K-10K 10K-20K 20K-30K > 30K AADT 2/4/2010 Kansas 8

Traffic Levels for Recycling Method CIR 100 State Agency Contractor 75 Responses, % 50 25 0 <5K 5K-10K 10K-20K 20K-30K > 30K AADT 2/4/2010 Kansas 9

Traffic Levels for Recycling Method FDR 100 State Agency Contractor 75 Responses, % 50 25 0 <5K 5K-10K 10K-20K 20K-30K > 30K AADT 2/4/2010 Kansas 10

Geometry HIR 100 State Agency Contractor 75 Responses, % 50 25 0 2/4/2010 Kansas 11

Geometry CIR 100 State Agency Contractor 75 Responses, % 50 25 0 2/4/2010 Kansas 12

Geometry FDR 100 State Agency Contractor 75 Responses, % 50 25 0 2/4/2010 Kansas 13

Climate HIR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 14

Climate CIR 100 State Agency Contractor 75 Responses, % 54 50 50 41 40 40 38 27 25 14 0 0 0 2/4/2010 Kansas 15

Climate FDR 100 75 Responses, % 50 25 0 2/4/2010 Kansas 16

Wear Courses 2/4/2010 Kansas 17

Surface HIR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 18

Surface CIR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 19

Surface FDR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 20

Specifications 2/4/2010 Kansas 21

Specifications HIR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 22

Specifications CIR 100 State Agency Contractor 75 Responses, % 50 25 0 2/4/2010 Kansas 23

Specifications FDR 100 State Agency Contractor Responses, % 75 50 25 0 2/4/2010 Kansas 24

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 Kansas 25

Preliminary Observations Project Selection ◦ Traffic  Contractors more likely to use CIR and FDR on 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 Kansas 26

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 Kansas 27

Questions ?????? 2/4/2010 Kansas 28