Bituminous stabilized materials guideline inception study
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Bituminous Stabilized Materials Guideline: Inception Study PowerPoint PPT Presentation


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Bituminous Stabilized Materials Guideline: Inception Study. Project Funded By: Gautrans Sabita. Background. ETB Materials ; Two guidelines exist: Sabita Manual 14 (1993) Sabita Manual 21 (1999) Foamed Bitumen Materials: TG2 Interim Guideline.

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Bituminous Stabilized Materials Guideline: Inception Study

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Bituminous stabilized materials guideline inception study

Bituminous Stabilized Materials Guideline:Inception Study

Project Funded By:

Gautrans

Sabita


Background

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


Main deficiencies mix design

Main Deficiencies: Mix Design

  • Lack of a suitable Curing Method

  • More appropriate tests to assess:

    • Flexibility

    • Shear Strength

    • Durability


Main deficiencies structural design

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


Project structure

Phase 1: Inception Study

Mix Design (K Jenkins)

Structural Design (F Long)

Phase 2: Mix Selection Criteria

Phase 3: Mix Design Issues

Refinement and Guideline Compilation

Phase 4: Structural Design Issues

Phase 5: Construction Issues

Phase 5: Guideline Finalization

Project Structure


Inception study objectives mix design

Inception Study Objectives:Mix Design

  • Identify Durability Test and gather curing data

  • Investigate Triaxial Testing protocols

  • Investigate Strain-at-Break

  • Plan and re-direct further activities


Inception study objectives structural design

Inception Study Objectives:Structural 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


Progress to date structural design

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


Some best candidate projects

Some Best Candidate Projects

  • HVS Tests:

    • N3-4, Mooi River

    • N2-16, East London

    • P9-3 Petrus Steyn

    • P243-1 Vereeniging

    • N7, near CT

    • N12-19 (current)

  • 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


Classification approach

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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