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Harmonizing Ontario’s HMA Specifications
Doubra Charles Ambaiowei, Ph.D.Technical Director
Ontario Asphalt Pavement Council (OAPC)Ontario Road Builders’ Association (ORBA)
Presentation Outline
o Recap: Present Concerns and Solution
o Why Harmonize?
o Evaluation Focus
o Conclusion
o Next Steps
Recap: Present Concerns
Recap: Solutions
Why Harmonize?
Evaluation Focus
Mix DesignMarshall
SuperpaveSMAWMA
RAP USAGEAllowed
RAP PercentageSurface/Binder
PGAC SpecificationPG 58-28
PMADENT/EXBBR
MSCRRecovered PGAC
HMA Acceptance CriteriaAC ContentGradation
Compaction
Tack Coat SpecificationTypes
Application Practices
Evaluation Focus: Mix Design
Consensus Requirements:o Increasing Asphalt Cement Content
o Use of Recycled Material
o Mixing and Compaction Temperatures
o Production Technologies
o Use of Additives
o Proportioning Mineral Fillers
o Use of Distinct Specifications - WMA
Evaluation Focus: RAP Usage
Concerns:o Premature Cracking
o Limitations to RAP Use
o Additional Test Requirements
o Environmental & Economic Consequences
Evaluation Focus: PGAC Specifications
Concerns:o Acceptance and Rejectable Criteria
o Inconsistencies with Test Procedures
o AC/Binder Literacy
Evaluation Focus: HMA Acceptance Criteria
Concerns:o Need for Adequate QC/QA Practices
o Sampling Methods
o Acceptance Plans
o Imposed Penalties on Non-conformance
Evaluation Focus: Tack Coat Specification
Current Types:o SS-1 Emulsified Asphalt
o SS-1 H
o MS-1
Application Practices:o Milled Surfaces
o Padded Surfaces
o Paved Surfaces
Conclusion
The goal of harmonization is to eliminate specification proliferation.
o Selecting Criteria Impacting on Mix Volumetrics and Density Requirements
o Rationale for Selecting Test Procedures, Setting Criteria and Limits
o Personnel Training
o Strong Commitment from ALL Stakeholders
o Timely Communication of Construction Notices
o General Compliance with Latest OPSS Specifications
Next Steps
o Engage with Specifiers on Ways to Achieve Durable HMA Pavements:
➢ Discuss to Better Understand These Specifications
o Encourage the NEED to Harmonize Specifications
THANK YOU FOR LISTENING
