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Recycling Porous Asphalt

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Presentatie recycling ZOAB in ZOAB (Engels)

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Recycling Porous Asphalt

  1. 1. Porous Asphalt Porous Asphalt Liverpool 22 & 23 February 2006 Alex van de Wall Business Development / R&D Recycling porous asphalt in porous asphalt
  2. 2. What <ul><li>Porous asphalt </li></ul><ul><li>Gap graded </li></ul><ul><li>11 or 16 mm size </li></ul><ul><li>Voids > 20% </li></ul>
  3. 3. What <ul><li>Introduction in the 70 ’s </li></ul><ul><li>Preferred asphalt mixture for primary roads </li></ul><ul><ul><li>reduced splash & spray </li></ul></ul><ul><ul><li>reduced noise levels </li></ul></ul><ul><li>Over 3000 km with Porous asphalt </li></ul><ul><li>8% of total asphalt production </li></ul>
  4. 4. What <ul><li>advantage = disadvantage </li></ul><ul><li>Open structure  good properties  short lifetime </li></ul><ul><ul><li>PA 8 -12 years </li></ul></ul><ul><ul><li>DA 5 - 20 years </li></ul></ul><ul><li>Ravelling </li></ul><ul><ul><li>bitumen ageing </li></ul></ul><ul><ul><li>less “embedding” </li></ul></ul>Gap graded Dense graded
  5. 5. Why <ul><li>Preferred asphalt + short life span = A lot PRAP </li></ul><ul><ul><li>In: 400.000 t/y </li></ul></ul><ul><ul><li>Out: 400.000 t/y </li></ul></ul><ul><li>Limited % in regular asphalt </li></ul><ul><ul><li>competition from regular RAP </li></ul></ul><ul><ul><li>specific nature </li></ul></ul><ul><li>Reconstruction of top layer only </li></ul><ul><li>Recycle PA in PA ! </li></ul>IN OUT
  6. 6. How <ul><li>Past experience </li></ul><ul><ul><li>sieving </li></ul></ul><ul><ul><li>special additives </li></ul></ul><ul><ul><li>maximum </li></ul></ul><ul><li>Optimum rather than maximum </li></ul><ul><li>Boundary conditions </li></ul><ul><ul><li>no pre-treatment & no waste </li></ul></ul><ul><ul><li>as good as “new” </li></ul></ul><ul><ul><li>production plant </li></ul></ul>
  7. 7. How <ul><li>Production </li></ul><ul><li>Product </li></ul><ul><ul><li>Formulation of mixes </li></ul></ul><ul><ul><li>Absolute & comparative testing </li></ul></ul><ul><ul><li>Field trials </li></ul></ul><ul><li>Market </li></ul>
  8. 8. How <ul><li>Production facilities </li></ul><ul><ul><li>parallel drum </li></ul></ul><ul><ul><li>drum mixer (few) </li></ul></ul><ul><li>Items </li></ul><ul><ul><li>temperature control </li></ul></ul><ul><ul><li>clogging </li></ul></ul><ul><ul><li>filter capacity </li></ul></ul><ul><li>Process before machinery </li></ul>
  9. 9. How <ul><li>Mix formulation </li></ul><ul><li>Grading & binder properties </li></ul><ul><ul><li>availability soft bitumen </li></ul></ul><ul><ul><li>% fines </li></ul></ul><ul><li>50% in theory </li></ul><ul><li>40 % in lab </li></ul><ul><li>30% - 35% production </li></ul>MRP ORP
  10. 10. How <ul><li>Lab Testing </li></ul><ul><li>Absolute & comparative </li></ul><ul><li>Drainage & noise </li></ul><ul><ul><li>porosity, permeability </li></ul></ul><ul><li>Durability & ravelling </li></ul><ul><ul><li>tensile strength </li></ul></ul><ul><ul><li>water sensitivity </li></ul></ul><ul><ul><li>cantabro </li></ul></ul><ul><ul><li>ravelling test </li></ul></ul>
  11. 11. How <ul><li>Trial sections </li></ul><ul><ul><li>150 m section </li></ul></ul><ul><ul><li>90° corner section </li></ul></ul><ul><ul><li>heavily trafficked </li></ul></ul><ul><li>Application technique </li></ul><ul><li>Monitoring </li></ul><ul><ul><li>skid resistance, braking distance </li></ul></ul><ul><ul><li>ravelling </li></ul></ul>
  12. 12. Status <ul><li>Developed product </li></ul><ul><ul><li>30 - 35% P-RAP </li></ul></ul><ul><ul><li>no pre-treatment </li></ul></ul><ul><ul><li>no “special” additives </li></ul></ul><ul><li>Production = leading </li></ul><ul><li>Market </li></ul><ul><ul><li>new criteria for aggregates </li></ul></ul><ul><ul><li>policy <> actions </li></ul></ul>
  13. 13. Conclusions <ul><li>Porous asphalt with PRAP is possible </li></ul><ul><li>Strive for optimum rather than maximum </li></ul><ul><li>A product without a process is useless </li></ul><ul><li>Yet another waste problem has been solved </li></ul><ul><li>What next ? </li></ul>

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