Feedback on hma recycling task team
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Feedback on HMA recycling task team. Trevor Distin RPF May 2008. Progress since last RPF. Resolution passed at Nov 07 RPF that a task team be established to: to develop best practice guidelines for the use of RAP in HMA this follows from 3 SAT seminars & specialty session held at CAPSA07

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Feedback on HMA recycling task team

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Feedback on hma recycling task team

Feedback on HMA recycling task team

Trevor Distin

RPF May 2008


Progress since last rpf

Progress since last RPF

Resolution passed at Nov 07 RPF that a task team be established to:

  • to develop best practice guidelines for the use of RAP in HMA

  • this follows from 3 SAT seminars & specialty session held at CAPSA07

  • first task team meeting held 24 April


Task team

Client

Dennis Rossmann

Adreo Brits

Rob Lindsay

Eric Lathlief/ Krishna Naidoo

Engineers

Derick Pretorius

Tony Lewis

Nico vd Walt

Benoit Verhaege

Manufacturers & Contractors

Bennie Greyling

Herman Marais

Wynand Nortje

Gary Catin

Task Team


Plan of action

Plan of action

  • Use draft TRH 21 (1996) as working document

  • Update with latest international best practice

  • Identify appropriate documents

  • Agree on content of new TRH 21

  • Appoint a consultant/s to rewrite new document

  • Identify specialists from task team to act as peer reviewers for each section

  • Contract specifications to be incorporated into revised COTO document

    • SANRAL to include in proforma project specifications


Proposed specification framework

Proposed specification framework

  • 3 classes of HMA

    • < 15% RAP

    • > 15 < 30% RAP

    • > 30 % RAP

  • Prescribe same mix end properties irrespective % of RAP within each class of HMA

  • For each class identify:

    • risk/application/constraints/protocols


Paradigm shift

Paradigm shift

  • Treat RAP as a valuable asset of the State

  • RAP to be regarded as an alternative aggregate source ie linear quarry

  • Stockpile RAP for general use on future projects

  • Optimise use of RAP

  • RAP to be seen as competitive advantage


Handling of rap

Handling of RAP

Develop protocol for reclaiming, stockpiling and processing RAP

  • Milling of RAP

    • Investigate insitu layers

    • Selected premilling

  • Stockpiling of RAP

    • Demarcate dedicated stockpiles

    • Minimise moisture content of RAP

    • Avoid segregation and consolidation

  • Processing of RAP

    • Screen RAP into different sizes

    • Fractionating of RAP when using >15%

    • Plant limitations

      • Type of plant

      • Where the RAP is feed into mixing process


Reference documents

Reference documents

  • Brock D (2007), Milling & recycling, Technical paper T-127

  • Newcomb D (2007), Designing HMA mixtures with high RAP content, QIS 124

  • Young T (2007), Processing & handling of RAP, IS 123

  • EN 13108-8 (2005), Bituminous mixtures – materials specifications for reclaimed HMA

  • Austroads (2000), Framework specifications for HMA recycling, AP-T02

  • Rebbechi J (2005), Austroads guide & commentary series on HMA recycling

  • PIARC (2007), Review of the growth & development of recycling in pavement construction


Content

Content

  • Introduction

  • Pavement recycling

  • Use of RAP in HMA plant recycling

  • Feasibility of recycling

  • Mix design

  • Reclaiming of RAP

  • Stockpiling of RAP

  • Mixing & plant


Way forward

Way forward

  • Appoint consultant/s

    • June 2008

  • Complete first draft

    • Nov 2008 RPF

  • Publish best practice document

    • Jan 2009

  • Workshop best practice document

    • Feb 2009


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