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Bituminous Stabilized Materials Guideline: Inception Study

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Limited database used for development. Lack of validation using long term field data ... Develop a design approach that relies on measurable, non-ambiguous parameters ... – PowerPoint PPT presentation

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Title: Bituminous Stabilized Materials Guideline: Inception Study


1
Bituminous Stabilized Materials Guideline
Inception Study
  • Project Funded By
  • Gautrans
  • Sabita

2
Background
  • ETB Materials Two guidelines exist
  • Sabita Manual 14 (1993)
  • Sabita Manual 21 (1999)
  • Foamed Bitumen Materials
  • TG2 Interim Guideline
  • Guidelines widely used, but there is a need to
  • Modernize
  • Improve
  • Create a single, combined guideline

3
Main Deficiencies Mix Design
  • Lack of a suitable Curing Method
  • More appropriate tests to assess
  • Flexibility
  • Shear Strength
  • Durability

4
Main Deficiencies Structural Design
  • Conservative structural designs (catalogue and
    design charts)
  • Questions about 2-Phase modelling
  • Need to incorporate curing effects
  • Limited database used for development
  • Lack of validation using long term field data

5
Project Structure
6
Inception Study ObjectivesMix Design
  • Identify Durability Test and gather curing data
  • Investigate Triaxial Testing protocols
  • Investigate Strain-at-Break
  • Plan and re-direct further activities

7
Inception Study ObjectivesStructural Design
  • Gather available performance data (LTPP HVS)
  • Analyze and identify trends (if any!)
  • Assess key deficiencies in available information
  • Plan and re-direct further activities

8
Progress to Date Structural Design
  • 126 Roads appeared on radar
  • 104 Emulsion Treated Base
  • 22 Foamed Bitumen
  • Only some roads suitable to study
  • Duplication amongst reported projects
  • Many roads recently constructed
  • Some very low traffic and/or no data
  • Urban legend

9
Some Best Candidate Projects
  • N12-19 (1974)
  • N2-16 (1982)
  • N3-4 (1988)
  • N4-5X (1997)
  • N4-1 (1997)
  • MR27 (1988)
  • N1-1 (1984)
  • N1-13 14 (1980)
  • P504 (1995)
  • Same-Himo Project (1992, LTPP study)
  • N7-7 (1987)
  • P24-1 (1999)
  • 20 Promising projects in total
  • HVS Tests
  • N3-4, Mooi River
  • N2-16, East London
  • P9-3 Petrus Steyn
  • P243-1 Vereeniging
  • N7, near CT
  • N12-19 (current)

10
Classification Approach
For each project, assess and classify
  • ETB/Foam source material
  • ETB/Foam stability flexibility properties
  • Support Layer quality and class
  • Subgrade quality and class
  • Maximum deflection range before/after
    construction
  • Standard axle range accommodated in field or HVS

Vision
  • Develop a design approach that relies on
    measurable, non-ambiguous parameters
  • Ensure transparent, straightforward validation of
    recommended designs
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