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Polymer Modified Bitumen. Oscar Ellison. Contents of presentation . Why do we use polymers What are polymers History in NZ and internationally Types and effects of different polymers Thermoplastic Plastomer Elastomer Thermoset and others The future. Why do we use polymers

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contents of presentation
Contents of presentation
  • Why do we use polymers
  • What are polymers
  • History in NZ and internationally
  • Types and effects of different polymers
  • Thermoplastic
    • Plastomer
    • Elastomer
  • Thermoset and others
  • The future
slide3
Why do we use polymers
  • Increase demand from the road network
  • Search for new ideas and technologies
  • Polymers are an effective solution

What is required

  • Enhance important properties of asphalt
  • Not detrimental to basic properties
  • Workable and able to process
  • Cost effective
what are polymers
What are polymers
  • Very large molecules
  • Made up of smaller monomers
  • Common both in nature and everyday life
  • First synthetic polymers created around 1910
  • Varying molecules and lengths
the chemistry styrene butadiene
The Chemistry: Styrene-butadiene

Butadiene

C4H6

Styrene

C6H5CH=CH2

use in new zealand
Use in New Zealand
  • Natural Latex in sealing
  • SBS, EVA and PBD in sealing
  • SBS and EVA in asphalt
types of polymer used
Types of Polymer Used

Elastomers

Plastomers

Thermoplastic

Thermoset

elastomers
Elastomers
  • Natural Rubber

Long flexible chains

  • SBR (Styrene Butadiene Rubber)

Random co-polymer

Hard styrene and rubbery butadiene

Both monomers compatible with bitumen

sbs styrene butadiene styrene
SBS (Styrene Butadiene Styrene)
  • Most commonly used polymer
  • Block co-polymer
  • Entropic – structural
  • Enthalpic - energy
plastomers
Plastomers
  • EVA

Ethylene Vinyl Acetate

Random co-polymer

Not crossed-linked

Raises stiffness and toughness at low temperatures

thermoset
Thermoset
  • Uncommon
  • Epoxy, Polyurethane
  • Once cured are not affected by temp
  • Difficult to handle
  • Created in situ – cross linked polymer network
  • Increased stiffness, rutting resistance, fuel resistance
slide14
Embrace the use of polymers
  • Sustainability etc. peak oil
  • Price of bitumen trending upwards need to find ways to reduce cost. Polymers can do this. Thinner layers etc.
  • New polymers. New technologies for mixing.
  • New thinking…