2014 Washington Asphalt Conference “Specification Update & Initiatives” Joe DeVol Assistant State Materials Engineer State Materials Laboratory.

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Presentation transcript:

2014 Washington Asphalt Conference “Specification Update & Initiatives” Joe DeVol Assistant State Materials Engineer State Materials Laboratory

2014 Updates 4-06 & Asphalt Treated Base Deleted - unused and incompatible with Superpave specifications (4) - Blending Sand Deleted - considered part of mineral aggregate Specification Updates

2014 Updates (1) - General Requirements Added Sand Equivalent requirement to aggregate source approval Restricted amount of No. 4 minus material - 5 percent by total weight of aggregate Specification Updates

2014 Updates (3)A - Material Transfer Device/Vehicle Amended - Engineer authority to exclude where not feasible Specification Updates

2014 Updates (7)A1 - General Contractor Mix Design Requirements AASHTO T Hamburg Wheel-Track Testing ASTM D Indirect Tensile Strength (IDT) Brand and type of anti- stripping additive, certificate of compatibility Specification Updates Optional See GSP

2014 Updates (7)A2 - Statistical or Nonstatistical Evaluation Contracting Agency Evaluation AASHTO T Hamburg Wheel-Track Testing ASTM D Indirect Tensile Strength (IDT) Specification Updates

2014 Updates (2) - HMA Test Requirements Hamburg & IDT Specification Updates

Mix Criteria HMA Class ⅜ inch½ inch¾ inch1 inch Min.Max.Min.Max.Min.Max.Min.Max. Hamburg Wheel-Track Testing, WSDOT FOP for AASHTO T 324 Rut Depth 15,000 Passes 10 Hamburg Wheel-Track Testing, WSDOT FOP for AASHTO T 324 Minimum Number of Passes With no Stripping Inflection Point 15,000 Indirect Tensile (IDT) Strength (psi) of Bituminous Materials WSDOT FOP for ASTM D

2014 Updates (10)B1 - General Added use of roadway cores to determine pavement density For use when practical & cost effective Includes bid item for Contractor coring Specification Updates

2014 Updates (10)B3 - Longitudinal Joint Density Deleted – now testing within 0.5’ of joint Specification Updates

2014 Updates (20) - Anti-Stripping Additive Added to the liquid asphalt prior to shipment Payment Bid price for HMA includes anti-stripping additive Specification Updates

2015 Updates QPL Mix Design Approval Process HMA Mixture & Density Test Sub-lot Sample Size Changes High RAP & RAS - GSP to Standard Specification (13) Surface Smoothness – revisions pending Specification Updates

2014 Questions? Washington Asphalt Conference “Specification Updates & Initiatives”