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CDOT WMA Project and Specifica7ons Summary
2011 Rocky Mountain Asphalt Conference and Equipment Show
CDOT 2007 WMA Project Summary
• Project Loca9on:I-‐70, 70 miles west of DenverMountain terrain – elev. 8,800’ to 11,100’
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
Advera-‐WMA
Sasobit
Evotherm injected into AC feed line here
Evotherm
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.“
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)
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)
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
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
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
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
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]