Presentation is loading. Please wait.

Presentation is loading. Please wait.

Specification Summary Where weve Been & Where we are Now (A Review of Past & Present Specifications) By: John Garrity Dave Holt, and Ron Bumann.

Similar presentations


Presentation on theme: "Specification Summary Where weve Been & Where we are Now (A Review of Past & Present Specifications) By: John Garrity Dave Holt, and Ron Bumann."— Presentation transcript:

1 Specification Summary Where weve Been & Where we are Now (A Review of Past & Present Specifications) By: John Garrity Dave Holt, and Ron Bumann

2 Bituminous Specification Timeline Specification 2331(Pre 1988) Specification 2340(1988) Specification 2340 Modified(1997) Specification 2350(1998) Specification 2360(1998) Combined 2350/2360(2003)

3 2331 MnDOT Standard Specification Before Agency Designed Mixes for Contractor. Process Control and Acceptance by Agency: Asphalt Spotchecks Aggregate Gradations Contractor Role To Produce and Place Mix

4 Specification 2340 Implemented in 1988 as a Quality Management Specification. Address problems associated with rutting and flushing and raveling. Contractor Involvement –Mix Design –Process Control Testing (QC) Mixture Acceptance –Air voids used as primary acceptance criteria

5 Specification 2340 Modified Implemented 1997 Enhancement to 2340 New Mixture Quality Measures –Voids in Mineral Aggregate (VMA) –Moisture Susceptibility (TSR)

6 Specification 2350 Implemented in 1998 as replacement for 2331 and 2340 (Marshall Design). Complete re-write of 2331 and Changed mixture designations Included VMA, TSR, F/A Increased Density Requirements Included Ride Requirement Removed methodology of 2331 and 2340 Included Incentives/Disincentives. Move toward end result specification. In 1998, required on all MnDOT projects with traffic < 3 million ESALs.

7 Specification 2360 Implemented in 1998 as Superpave specification and a companion specification to Same requirements as 2350 including additional aggregate requirements. –Included Incentives/Disincentives. –Move toward end result specification. In 1998, required on all MnDOT projects with traffic > 3 million ESALs.

8 2360 Combined 2360/2350 (Gyratory/Marshall Design) Specification Implemented in 2003 as a new stand-alone specification. Includes both Marshall and Gyratory (Superpave) design. Current MnDOT specification selection criteria: –Gyratory Design All new construction and mid and long life overlays. –Marshall Design Short life overlays (<5 years) and/or small quantities (<5,000 tons).

9 Responsibility Levels Through Specification Evolution Mix DesignAgencyContractor Plant Prod/ControlAgency Contractor Field CompactionAgencyAgncy/ Cont. Contractor (Density)

10 Specification Evolution is a result of... Agency & Industry Initiative –Asphalt Pavement Performance Steering Committee MnDOT, FHWA, Industry, and Local Government –Specification Technical Working Group

11


Download ppt "Specification Summary Where weve Been & Where we are Now (A Review of Past & Present Specifications) By: John Garrity Dave Holt, and Ron Bumann."

Similar presentations


Ads by Google