RUT MIX CHALLENGE

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RUT MIX CHALLENGE

• GAUTRANS
• RPF NOVEMBER 2006

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RUT MIX CHALLENGE

• The need arose from increased occurrence of
  premature failures
• As a result Client bodies want to move away from
  asphalt to concrete
• Better solution would be a properly designed
  asphalt that will be
• Rut resistant
• Durable at low and high temperatures
• User Friendly (Manufacturing Placing)

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RUT MIX CHALLENGE

• Role players in asphalt industry to develop 2
  asphalt mix designs namely
• Rut resistant intersection mix
• Every day highway mix
• Subsequently high modules asphalt included
• Shell with low pen binder (French Technology)
• Sasobit with 40/50 or Sasoflex (German French
  Technology)
• These mixes will then be paved on a freeway in
  Pretoria and tested for rutting, fatigue etc.

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RUT MIX CHALLENGE

• Rules for mix design
• No modified binders (Rut mix Highway mix)
• Any grading (Not limited to Colto Spec.)
• Mixes to be verified prior to paving of trials in
  Pretoria
• Reference mix to be paved and tested prior to
  trials being paved

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RUT MIX CHALLENGE

• WEST RAND

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RUT MIX CHALLENGE

• Mix design process
• First plant trials completed
• Intersection mix is promising (Performance
  testing indicates good rut resistance)
• Paving trial planned on R25
• Freeway mix needs refining
• Further plant trials planned

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RUT MIX CHALLENGE

• EAST RAND

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RUT MIX CHALLENGE

• Verification with Performance Properties

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RUT MIX CHALLENGE

• AKASIA ROAD SURFACING

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RUT MIX CHALLENGE

• Akasia Road Surfacing - Mix design process
• Design in process
• Change of aggregate source (From Rooiberg to
  Granite from Buffalo quarry Naboomspruit)
• Mix type not finalized

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RUT MIX CHALLENGE

• BLACK TOP

NICO WILCOCKS
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RUT MIX CHALLENGE

• Mix design process
• TRH8 Coarse
• Chrome Slag from Witbank
• High PSV
• Rough surface texture
• Good adhesion
• Varying surface area
• No swell problems
• Mix used successfully on N4 at Tollgate bypass

NICO WILCOCKS
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RUT MIX CHALLENGE

• HIGH MODULUS ASPHALT
• (HiMA)

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RUT MIX CHALLENGE

• High Modulus Asphalt (HiMA)
• Mix design process
• Sasobit
• Soillab busy with mix designs similar to Hamburg
  International Airport (40/50 Bitumen 3
  Sasobit)
• Shell
• Aggregate and bitumen samples sent to Shell
  Global Solutions France (Low pen bitumen)

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ACHIEVING VOLUMETRICS IN ASPHALT

• BAILEY METH0D

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IS NOT A SPECIFICATION!!!
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Bailey Method

• What is voids and VMA?

Volume Voids (3 - 6)
VMA
Volume Binder (10 - 17)
Volume Aggregate (83 90)
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