Harmonizing Ontario’s HMA Specifications
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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)
Transcript of Harmonizing Ontario’s HMA Specifications
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
