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Rubberasfalt in de wegenbouw

Rubberasfalt in de wegenbouw. Fedde Tolman Hollandsche Beton Groep - Civiel Netherlands Pavement Consultants bv . contents. pavements asphalt bitumen modified bitumen rubber modified binder. pavements. primary function: transfer forces from vehicle to earth loads on pavements traffic

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Rubberasfalt in de wegenbouw

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  1. Rubberasfalt in de wegenbouw Fedde Tolman Hollandsche Beton Groep - Civiel Netherlands Pavement Consultants bv

  2. contents • pavements • asphalt • bitumen • modified bitumen • rubber modified binder

  3. pavements • primary function: transfer forces from vehicle to earth • loads on pavements • traffic • mechanical • noise • weather • moisture induced softening of grain material • high temperature softening • cracking due to restrained shrinkage

  4. pavement performance • crack control • evenness • fixation of particles • skid resistance • visibility • noise

  5. applications • roads • industrial areas • airports • bridge decks • steel: structural • concrete: environmental protection • floors

  6. Pavement structure

  7. composition asphalt • mineral (type and gradation) • bitumen (pen) • additives • pores

  8. Most important Dutch asphalt types

  9. bitumen • Samenstelling • asfaltenen • maltenen • alifaten • aromaten • karakterisering • rheologisch (modulus en fasehoek) • empirisch (penetratie en verwekingspunt) • functioneel empirisch (breekpunt, verwekingspunt, mengviscositeit)

  10. Polymer modifications

  11. Inert and chemical modifications

  12. Consistency - temperature

  13. Force - ductility

  14. Molecular distribution

  15. Risks in modifications • compatibility bitumen and polymer problematic (mixing of bindertypes) • asphalt mixing and compaction higher risk of being problematic • mechanical improvement unclear • hot reuse in principle no problem • registration of application regarding demolition • quality control of procedure; tedious product control

  16. Rubber in asphalt

  17. rubber in pavements: panacea? • rubber modified binder in asphalt • stiffness, fatigue, stability (permanent deformation) • impact absorption and strength • damping of vibration • abrasion • noise • friction • reduced temperature sensitivity • durability (ageing, adhesion, friction)

  18. Types of rubber applications • in asphalt • rubber granulate and filler in asphalt • blocks, tiles and slabs • joints • in binder • dissolved • emulsification • powder (5 – 7%) • tyre scrap (4 – 8 %)

  19. motives: • improvement of pavement • recycling / waste reduction (esp. of wasted tyres) • sustainability • emission • exposure • toxicity • environment

  20. Effect rubber addition

  21. Proefvakken A10 1990

  22. Productie 18 juni (vakken 0 t/m 5) • aanleg ZOAB-proefvakken probleemloos • vak 1 met 4,5% rubberbitumen stolling van het bindmiddel: verpompbaarheid • bindmiddeltemperatuur verhoogd  viscositeit • pomp roerketel en installatie in serie  druk • vak 2 (5,5 %) geen problemen • vak 4 (4,5%) zelfde problemen als vak 1 • vak 5 (5,5%) geen problemen

  23. conclusions • Technical • bitumen are the main binding part; polymers and rubbers are specific • mechanical properties may be improved but also worsened by rubber addition • quality control problematic • no final qualification

  24. Environmental • reuse tires • reduction noise • higher production temperatures • Health and safety • exposition to tire components • higher temperatures --> more emissions

  25. perspectives • Rubber remains of interest for modifying binders and may become so as granulates • noise and reuse most important motives • vibration and impact may be of interest

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