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Maximizing Asphalt Compaction for Extended Pavement Durability

Learn about the crucial aspects of proper asphalt compaction to enhance pavement performance, strength, and longevity. From design specifications to rolling techniques, every step is vital for durable road surfaces.

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Maximizing Asphalt Compaction for Extended Pavement Durability

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  1. Extending Performance with Proper Asphalt Compaction Ken Walschlager Milestone Contractors

  2. Compaction is 90% rolling – the other half is preparation… • Compaction is the process of reducing the volume of a mass of material – making it more dense. • Design • Proper production • Sub-base/drainage • Good paving practices • Lift thickness

  3. Compaction is key… • Better Compaction results in… • Extended pavement’s life of service • Greater strength to support heavier loads • Increased resistance to rutting • Reduced permeability of water and air • Overall durability

  4. Proper HMA Design • Different designs for different applications • Special mix designs • OG • Porous • SMA • 4.75 Thin Lift • What about Warm Mix?

  5. Proper Depth • Back to design…

  6. Proper Production • Stockpiles built correctly and tested? • Loader using correct methods? • Plant calibrated? • Right blend entered? • Proper loading of haul trucks? • Trucks equipped with tarps?

  7. Proper Laydown • Surface properly prepared/tacked? • Mix dumped properly into buggy/paver? • Hopper not run empty? • Flow gates/auger speed set correctly? • Proper head of material? • Auger height correct/constant motion? • Paver operated at constant speed? • Depth as uniform as possible?

  8. Proper Depth – it’s important • Deep enough for aggregate structure

  9. Before rolling operations begin • Proper maintenance – read operators manual • Operator Safety – get familiar with roller • Check water system • Release agent? • Confirm frequencies

  10. Rollers • Static • Double drum • 3 Wheeled • Pneumatic Tire • Vibratory • Oscillatory • Combination Rollers

  11. Static Rollers • Variables • Weight, speed, rolling pattern • When? OG, Porous, SMA, 4.75mm*

  12. Vibratory Rollers • Variables • Amplitude • Frequency • Speed (impact spacing)

  13. Amplitude

  14. Frequency • Impact Spacing • Check owners manual.

  15. Frequency • Correct impact spacing

  16. Roller Speed • Paver = Plant = Trucking • # of Passes of breakdown roller • Frequency setting • Tender Zone? • Roller width/paving width

  17. Paver/Roller Speed • Do not out run your rollers. • 3.5 mph roller 300ft/min – 3 wide to cover X 4 passes 300/12=25ft/min 85% rolling = 21 ft/min paver speed (140tph) 300ft/min – 2 wide to cover X 4 passes 300/8=37.5 85% rolling = 32 ft/min paver speed (211tph)

  18. Rolling • Turn towards the shoulder(away from traffic) stopping at an angle. • Make sure vibration is turned off before stopping. • Be sure not to turn wheel while stopped. • Break down when asphalt is at its hottest. • Cover entire mat with one pass before starting 2nd.

  19. Rolling cont. • Take previous stop marks out with next pass. • As paver moved forward, roll up to paver with each pass to seal in heat. • Roll handwork as soon as possible. • Proper longitudinal joint construction. • Stay on hot mat • Know when to “pinch the joint” • Cross-roll transverse joints.

  20. Porous/OG • Static only • Strength through design with aggregate structure and modified AC • Vibration can cause over compaction

  21. Stone Matrix Asphalt • Static roll only • Roll as hot as possible • Typically no tender zone • Roll until cool – little concern of over-rolling

  22. Warm Mix • Easier to compact • Higher densities reported • Open to traffic sooner • Use same good rolling procedures as HMA

  23. Summary • Good design • Proper production • Proper paving practices • Good rolling techniques • Stay watchful – things change…

  24. Thanks • Questions?

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