Ultra Thin Bonded Wearing Coarse Sponsored by: Minnesota LTAP Center Presented by: Michael Marti, P.E. SRF Consulting Group, Inc. Dan Wegman, P.E. SemMaterials.

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Presentation transcript:

Ultra Thin Bonded Wearing Coarse Sponsored by: Minnesota LTAP Center Presented by: Michael Marti, P.E. SRF Consulting Group, Inc. Dan Wegman, P.E. SemMaterials

A little history First Trial in France Introduced in U.S Jobs in TX & AL Jobs in NJ & PA Jobs in MN

Ultra Thin Bonded Wearing Coarse What is it? Surface Treatment –Preventive Maintenance –Corrective Maintenance (Surface Rehabilitation) Single Pass System –Emulsion membrane –Thin gap-graded hot mix –Placed with Special Equipment

3 Processes Spray Novabond Lay Hot Mix Smooth the Mat Ultra Thin Bonded Wearing Coarse Machine Specially Engineered Application of membrane Application of HMA

Ultra Thin Bonded Wearing Coarse: The Process Existing Pavement Surface of Mix 3/16” Membrane Coating on mix 3/8” Agg Size Total 9/16” Depth of Mix The Novabond Cures, Bonding the HMA to the Pavement

Polymer Modified Membrane Sprays easily Cures quickly Superior bonding

Ultra Thin Bonded Wearing Coarse HMA High quality aggregate –Restores & retains friction Gap-graded –Reduces noise –Reduces backspray Mix designed specially for process

Ultra Thin Bonded Wearing Coarse Binder Polymer modified binder –Less draindown –More forgiving (less sensitive to temp, etc.) –Quicker traffic return –Sticks better, less water sensitivity –Better cracking resistance –More durable

Application rates Emulsion membrane – gal/yd2 Ultra-thin hot mix asphalt overlay –Type A #/yd2 –Type B #/yd2 –Type C #/yd2 Total thickness: 3/8 to 3/4”

Rolling & Return to Traffic Rolling only to seat aggregate Return to traffic in minutes

Ultra Thin Bonded Wearing Coarse Construction Advantages Quick to apply Reopens to traffic quickly Cost effective

Performance Resists wear & rutting High skid resistance Reduced tire splash, hydroplaning Reduced tire noise Seals out water No loose aggregate Thinner lift –reduces applied weights –overhead clearance, curb reveal & drainage profiles –maximizes use of expensive aggregates

Reduced Backspray Wisconsin project ADT Backspray from dense graded surface Greater visibility on Ultra Thin Bonded Wearing Coarse surface