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Coolpave (TM) (with LEA) Open Graded Asphalt. Mike Marsden Glynn Holleran Prepared for RNZ Asphalt Forum November 2010. Outline. What is Coolpave (TM) with LEA? OGPA design with Coolpave (TM) Manufacturing Coolpave (TM) OGPA Trials Yard Trial Network Trial.

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Coolpave tm with lea open graded asphalt

Coolpave (TM) (with LEA) Open Graded Asphalt

Mike Marsden

Glynn Holleran

Prepared for RNZ Asphalt Forum November 2010


  • What is Coolpave(TM) with LEA?

  • OGPA design with Coolpave(TM)

  • Manufacturing Coolpave(TM) OGPA

  • Trials

    • Yard Trial

    • Network Trial

What is coolpave tm with lea
What is Coolpave(TM) with LEA?

  • Manufacturing

  • Mix temperatures reduction

  • Reduce carbon footprint

  • Workability improvements

  • Eliminate fumes

  • Increase work safety

  • Reduce odours

  • Reduce green house gases

Environmental benefits
Environmental Benefits

  • Reduction in production temperatures

  • 45 % reduction in fuel

  • Up to 50% reduction greenhouse gases

  • More than half Carbon Footprint

  • No smoke fuming

  • No odour when manufactured

  • 20 times fewer emissions and fuming in field

    • Ideal for urban areas with pedestrians

    • More pleasant for laying crew

  • Large reduction in use of release agent

Environmental benefits1
Environmental Benefits

Standard Hotmix


  • Compacts easily as hotmix

  • Retains its workability for longer

    • More time for compaction

    • Good for long duration hand work, mix will retain workability

  • Can be placed in colder temperatures

  • Can be carted further

  • Improvement in longitudinal joints

Technical benefits
Technical Benefits

  • Anti-stripping

  • Compaction can be achieved on

    • stiffer mixes

    • colder temperatures

  • Longitudinal joints

  • Mix designs : Adopting AAHSTO R35 Addendum

  • All international research

  • Logistical

Why in ogpa
Why in OGPA ?

  • First for NZ

  • OGPA generally fails by ravelling, this is a function of design, ageing of binder and maintenance of structural integrity

  • OGPA Coolpave(TM) with LEA oxidises binder less in manufacture

  • Can be used with Recycle polymer, SBS or straight bitumen

Ogpa design with coolpave
OGPA Design with Coolpave

  • Design is same as with P/11 or P/23 design criteria for mix

  • Binder coats aggregate by wetting, wetting is determined by both chemistry and temperature

  • In Coolpave with LEA™ an additive that is similar in chemistry to antistrips BUT non toxic is added to give wetting and stone coating at lower temperatures

  • Moisture is added which foams the bitumen and improves workability

  • Mix temperatures are up to 40C lower than for standard OGPA

Coolpave use in nz
Coolpave use in NZ

  • Auckland Motorway Alliance OGPA

  • CHCH City all mixes

  • CHCH airport- award winning work

  • Auckland Coolpave trials

  • Work in Dunedin , Marlborough, NH and Nelson.

  • Internationally millions of tonnes have been used in USA and Europe of warm and coolpave mix

Trail 1 yard
Trail 1 Yard

  • Ring Road Mt Wellington Plant

  • Laid by paver normal methodology

  • Laying temperatures and method optimised

  • No Odour

  • Crew reported laid satisfactorily

  • Normal rolling

  • Opened to trucks in 30 minutes

  • Laid in 25mm and 35mm layers

Permeability sand circle
Permeability & Sand Circle

  • Average Permeability 8.6 sec

  • Average MPD 1.27mm

10 month performance
10 Month Performance

  • Hammered by heavy trucks

  • Standing up well

Field trial sh 1 sunnynook to tristram interchange
Field Trial – SH 1 Sunnynook to Tristram Interchange

  • Northern gateway to Auckland City

  • ADT 50,000

  • 460 tonne pave 50% coolpave

Field trial sh 1 sunnynook to tristram interchange1
Field Trial – SH 1 Sunnynook to Tristram Interchange

Permeability testing at 8 months Coolpave 10.6 sec Stand OGPA 9.3 sec (Spec 12 sec max)

The future
The Future

  • Annual Monitoring of high speed data and permeability test

  • 10/11 Pave 10% in Coolpave OGPA

  • 11/12 pave 20% in Coolpave OGPA

  • Look to introduce HDPE binder