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

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

  • first task team meeting held 24 April


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

  • 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

  • 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

  • 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

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

  • 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

  • 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

  • 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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