1 Asphalt Recycling and Materials Asphalt Recycling and Materials Re-use in Asphalt Pavements Re-use in Asphalt Pavements L’Aquila, Italy, 27 – 29 June 2007 L’Aquila, Italy, 27 – 29 June 2007 Hussain A Khalid Hussain A Khalid University of Liverpool, U.K. University of Liverpool, U.K.
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Asphalt Recycling and Materials Re-use in Asphalt …4 •In the UK, asphalt recycling is common, encouraged and is specified by national standards. –In-situ recycling comprises
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Asphalt Recycling and Materials Asphalt Recycling and Materials Re-use in Asphalt PavementsRe-use in Asphalt Pavements
L’Aquila, Italy, 27 – 29 June 2007L’Aquila, Italy, 27 – 29 June 2007
Hussain A KhalidHussain A KhalidUniversity of Liverpool, U.K.University of Liverpool, U.K.
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ContentsContents• Introduction – outline of current recycling Introduction – outline of current recycling
position in UK;position in UK;• Experience with re-use of two materials in Experience with re-use of two materials in
Recycling – Is it all worth it?Recycling – Is it all worth it?
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• In the UK, asphalt recycling is common, In the UK, asphalt recycling is common, encouraged and is specified by national encouraged and is specified by national standards.standards.– In-situ recycling comprises three processes:In-situ recycling comprises three processes:
• RepavingRepaving• RemixingRemixing
• Retread – Retread – Cold (may adopt emulsion or foam Cold (may adopt emulsion or foam bitumen)bitumen)
IntroductionIntroduction
Hot – Wirtgen Machine
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IntroductionIntroduction
– Plant recycling (off-site)Plant recycling (off-site)•Hot recycled materials in modified batch Hot recycled materials in modified batch
plants have been used. More recently, cold plants have been used. More recently, cold recycled materials have evolved using recycled materials have evolved using bitumen emulsion or foam.bitumen emulsion or foam.
66HD35/04 Design Manual for Roads & Bridges
Provisions for use of secondary and recycled materials in UK pavements
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Recent and current research on Recent and current research on materials re-use in asphalt materials re-use in asphalt
IBAA in asphaltIBAA in asphalt• IBAA has been used to replace virgin IBAA has been used to replace virgin
(limestone) aggregate in an asphalt (limestone) aggregate in an asphalt mixture suitable for base or binder coursemixture suitable for base or binder course