Ontario. Nabil Kamel, M.A.Sc. P.Eng. CCIL Certification Programs Manager. Implementation of Superpave in. Ontario

Transcription

1 Nabil Kamel, M.A.Sc. P.Eng. CCIL Certification Programs Manager s history for implementation of Superpave goes back 20 years s experience is primarily the MTO s history with the technology MTO is the largest single user of Superpave Majority of asphalt mix used is Marshall specified 1

2 Recap of implementation history Binder Mix Challenges Summery of current status and future development needs MTO 1 St Superpave Contract Petawawa Test Site FHWA s SPS 9A Binder Placed Fall 96 Surfaced Spring 97 2

3 Acquired binder testing equipment and training in mid 1990s Participated in the SPS 9A Superpave Demonstration Project Full binder implementation through the PGAC Committee All stakeholders: Suppliers, ORBA, OHMPA, MEA, CCIL PG ZONE 1 French River Lake Nipissing Mattawa River 54 Sudbury Q U E B E C L a k e H u r o n Sarnia PG St. Thomas 32 Chatham Honey Habour 31 Mississauga London/St ratford Waterdown L a k e E r i e 52 Huntsville 43 Bancroft 33 Taylor Corners Owen Sound Central Campbellford Region Cavan Oshawa Pickering ZONE 3 Brantford Tillsonburg Dundas Longford ZONE 2 PG Toronto L a k e O n t a r i o 41 Kingston N E W Y O R K U. S. A. 42 Ottawa Mallorytown LEGEND Zone Boundaries North boundary for "warm" belt (see text) Southern Performance Graded Asphalt Cement Zones 6 3

4 PGAC BINDER TESTING DYNAMIC SHEAR RHEOMETER PRESSURE AGING VESSEL ROTATIONAL VISCOMETER BENDING BEAM RHEOMETER Testing capability is now well established (supplier labs plus 6 8 others are certified for PG Binder testing). PGAC Challenges Initial position: Spec to be blind to the method of modification Pavement cracking led MTO to introduce additional tests such as extended BBR and DENT Spec has now evolved: PPA is governed more tightly MSCR used to evaluate polymer modified binders Responsible use of recycled engine oil bottoms Responsible use of RAP MTO/Industry consultations continue. 4

5 Superpave Mix Design Implementation Preceded by a detailed study of existing aggregates and mixes specifications for aggregates, mixes, Marshall mix design and acceptance during construction Challenge was to incorporate the advancements of Superpave but not give up on the knowledge base PGAC Committee evolved into the Superpave Implementation Committee (OSIC) First MTO Superpave contracts in 2002, 30% Incremental implementation 100% by FC FC 2 Superpave Mixes

6 Mix Types in MTO Contracts Use 25.0 mm for lower binder course if opportunity permits ( mm lift) Use 19.0 mm for binder courses (in place of HL 4, HDBC, MDBC, HL 8) Use 9.5 mm for levelling course Use 12.5 mm for all surface courses 12.5FC 1 for HL 1 applications 12.5FC 2 for DFC applications 12.5 for HL 4 (amended gradation) Hwy. 6, 2002: Dufferin 6

7 Challenges Mix Design/Construction Initial designs were often very coarse and dry Joint and segregation issues MTO response: Independent expert review of three contracts Fine graded mixes are promoted Percent AC for bid purposes VMA introduced into ERS as integral part of Mix acceptance Stripping tests are used but other Performance tests need to be implemented Current Status Superpave Ministry of Transportation Larger Municipalities Ottawa, York, Hamilton, etc. Marshall Most municipalities Private sector Both use Performance Graded Binders 7

8 Summary Remarks Significant Superpave implementation in Marshall is predominant in the private sector and smaller municipalities There continue to be challenges on the binder side Quality of AC?, RAP content? Methods of modification? On the mix side, Superpave design and testing capability is well established, but Work needs to be done to put in place performance testing Thank you 8