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Polymer Modified Bitumen

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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Polymer Modified Bitumen

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  1. Polymer Modified Bitumen Oscar Ellison

  2. 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

  3. 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

  4. 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

  5. The Chemistry: Styrene-butadiene Butadiene C4H6 Styrene C6H5CH=CH2

  6. Use in New Zealand • Natural Latex in sealing • SBS, EVA and PBD in sealing • SBS and EVA in asphalt

  7. Types of Polymer Used Elastomers Plastomers Thermoplastic Thermoset

  8. Elastomers • Natural Rubber Long flexible chains • SBR (Styrene Butadiene Rubber) Random co-polymer Hard styrene and rubbery butadiene Both monomers compatible with bitumen

  9. SBS (Styrene Butadiene Styrene) • Most commonly used polymer • Block co-polymer • Entropic – structural • Enthalpic - energy

  10. Plastomers • EVA Ethylene Vinyl Acetate Random co-polymer Not crossed-linked Raises stiffness and toughness at low temperatures

  11. 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

  12. 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…

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