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bituminous stabilized materials guideline

The Need for Recycling Alternatives. . Percentage of Designs in TRH4 Catalogue for > 3 msa. 10%. 20%. 30%. 40%. 40%. 50%. 60%. . . . . . . Current Guidelines: Main Deficiencies. Mix DesignLack of a suitable curing methodLack of a suitable Shear Strength testLack of criteria to assess durability

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bituminous stabilized materials guideline

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    1. Bituminous Stabilized Materials Guideline Project Initiated By: Gautrans Sabita

    2. The Need for Recycling Alternatives

    3. Current Guidelines: Main Deficiencies Mix Design Lack of a suitable curing method Lack of a suitable Shear Strength test Lack of criteria to assess durability & flexibility Structural Design Very Conservative designs Need to expand knowledge base and incorporate long term field data

    4. Project Structure

    5. Tasks for Phase 2 Mix Design Adapt triaxial test and classification limits Develop durability test and classification limits Standardize specimen preparation, curing, compaction & testing Structural Design Expand LTPP database Develop and calibrate material classification method and pavement design method

    8. Structural Design Method Depend on Rational Inputs: Determined from field tests using a specific procedure Direct linkage with specifications Clarity and Transparency Traceable validation Implements design fundamentals Straightforward Implementation Requires no specialist software Reliable and Robust

    9. Design Outputs & Expectations

    10. Development Approach

    12. Conclusion Structural Design: Concept finalized March 2007 Pilot implementation & refinement Mar ’07 to Jan ‘08 Mix Design Protocols (2007) Focus on Shear & Durability Improved criteria and classification limits Longer term testing and implementation of new tests…(2008+)

    14. Design Methodology Concept

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