CDOT WMA Project SummaryCDOT%2007%WMA%ProjectSummary • ProjectLocaon: I70,%70%miles%westof%Denver...
Transcript of CDOT WMA Project SummaryCDOT%2007%WMA%ProjectSummary • ProjectLocaon: I70,%70%miles%westof%Denver...
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CDOT WMA Project and Specifica7ons Summary
2011 Rocky Mountain Asphalt Conference and Equipment Show
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CDOT 2007 WMA Project Summary
• Project Loca9on:I-‐70, 70 miles west of DenverMountain terrain – elev. 8,800’ to 11,100’
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CDOT WMA Project Summary• Traffic30,000 AADT, 10% trucks, 4.85M ESALS (10-‐yr.)
• Extreme winter condi9ons (truck chain area)
Winter 2007/8 Stats:
-‐ Snowed 65 of 76 days between 12/1 & 2/14
-‐ 128 chain-‐days total for 2007/8
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Advera-‐WMA
Sasobit
Evotherm injected into AC feed line here
Evotherm
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Three-‐Year Evalua9on and ReportNCAT Report 10-05
Three-Year Evaluation of the Colorado Department of Transportation’s Warm-Mix Asphalt Experimental Feature on I-70 in Silverthorne, Colorado
Final Report
By
Tim AschenbrenerBill SchiebelRandy West
Sponsored by: Colorado Department of Transportation
CONCLUSIONS:
“… A`er three years of field evalua9ons in a loca9on with a harsh winter climate, the performance of the WMA test sec9ons was comparable to the HMA control sec9ons in regards to rudng, cracking, and raveling. The field performance was excellent.“
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CDOT/CAPA Task Force
• Process for WMA Approval and Use
• Specs allow either HMA or Approved WMA
• Colorado Procedure 59Standard Prac*ce forContractor Non-‐Standard Asphalt Mix Approval
-‐ requirements for submigal, review and pos9ng of approved non-‐standard mixtures (including WMA technologies and contractors)
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Colorado Procedure 59
REFERENCED DOCUMENTS CDOT Procedural Direc*ve 1401.1 Product Evalua7on and Experimental Features Colorado Procedures 52 Contractor Asphalt Mix Design Approval Procedures AASHTO Procedure R35 Appendix Special Mixture Design Considera*ons and Methods for
Warm Mix Asphalt (WMA)
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Colorado Procedure 59
WMA approval required for WMA Technology and Contractor
WMA mixes must conform to CDOT Superpave Specifica9ons
WMA Mix Design Criteria
Aggregate absorp9on 1.3% or less -‐ can use HMA mix design without addi9ves
Aggregate absorp9on greater than 1.3% -‐ AASHTO R35 WMA Mix Design
WMA mix and binder project acceptance per exis9ng CDOT HMA procedures
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Colorado Procedure 59SUBMITTAL REQUIREMENTS -‐ Electronic Submigals Required
WMA Technology
Summary of the technology Process controls
Addi9ve types and quan99es Addi9ve influence on mix
Equipment & plant requirements " Benefits MSDS for addi9ves Product history
Project History with data Research data
Approvals from other agencies Design Considera9ons
Produc9on Considera9ons (volumetrics)
Technology Supplier Contacts
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Colorado Procedure 59SUBMITTAL REQUIREMENTS con9nued
WMA Contractor
Contractor WMA Experience, if any
Contacts for past project owners
Contractor Contacts
Design Considera9ons Produc9on Considera9ons
~ plant configura9on and control
~ an9cipated field volumetric impacts for ini9al approval
~ contractor-‐recommended field volumetric adjustment
from lab results for specific mixes during construc9on
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Colorado Procedure 59
• Review and approval ideally outside the construc9on season
• Approved WMA technologies and contractors posted to CDOT Website
• Only approved technologies and contractors allowed to supply WMA
• WMA use is the contractor’s op9on – paid for under current HMA bid items
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Colorado Procedure 59
• Copies of CP-‐59 Available
Bill Schiebel, CDOT Region 1 Materials Engineer4670 North Holly Street, Unit BDenver, CO 80216Phone: 303-‐398-‐6801email: [email protected]
• Ques9ons
mailto:[email protected]:[email protected]