VDOT Hi-Polymer Asphalt Field Perspective. Virginia Asphalt Association Fall Conference Richmond, VA
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1 VDOT Hi-Polymer Asphalt Field Perspective Virginia Asphalt Association Fall Conference Richmond, VA October 4, 2015 David P. Shiells, P.E. District Materials Engineer
2 Hi-Polymer Applications in NoVa Subdivision Summerwood Circle and cul-de-sacs Completed paving in August, 2014 SM-9.5A HP and control SM-9.5A HR Interstate, I-95 I-95 in Prince William County Paving in Summer/Fall, 2015 SM-12.5E HP, SM-9.0E HP, SMA-9.5 HP Interstate, I-495 I-495 NB in Fairfax County Paving in Summer 2016 Full depth, full width joint patches with BM-25.0 HMHB SM-12.5E HP 4
3 Summerwood Subdivision 5
4 Summerwood Subdivision Background Typical subdivision streets CCI ratings 6 to 34, average 20 6
5 Summerwood Subdivision Pavement Structures Cul-de-sac Typically 3 AC over 6 aggregate Fatigue and thermal/environmental cracking 7
6 Summerwood Subdivision Pavement Structures Summerwood Circle Typically 4.5 AC over 8 aggregate Thermal /environmental cracking 8
7 Summerwood Subdivision Milled Surfaces (Cul-de-sacs) Thin structures Base layers cracked 9
8 Summerwood Subdivision Milled Surfaces Summerwood Circle Thicker structure Mostly block cracking 10
9 Summerwood Subdivision 11
10 Summerwood Subdivision 12
11 I-95 in Prince William County Background Composite pavement (PCC overlaid with 4-5 of AC) Reflective cracking at transverse joints Last milled/resurfaced with SMA in late 1990s Occoquan River Stafford Co. Line 13
12 I-95 Pavement Conditions Reflective Cracking Medium Severity 14
13 I-95 Pavement Conditions Reflective Cracking High Severity 15
14 I-95 Pavement Conditions Complete Failure Very high severity cracking Base failure 16
15 I-95 in Prince William County Projects Completed in 2015 Prince William County Parkway to Mine Road, SB and NB Mill 2 Resurface with 2 SM-12.5E Prince William County Parkway Mine Road 17
16 I-95 in Prince William County Projects Completed in 2015 Mine Road to Stafford County Line, SB and NB Mill 2, patch at joints Resurface with 2 SM-12.5E (HP) Mine Road Stafford County Line 18
17 I-95 in Prince William County Projects Completed in 2015 Occoquan River Bridge to Prince William Parkway, SB Mill 2, patch at joints Resurface with 1 SM-9.0 (HP) and 1.5 SMA-9.5 (HP) Occoquan River Prince William Parkway 19
18 I-495 in Fairfax County Background Composite pavement (PCC overlaid with 4-5 of AC) Severe concrete deterioration near transverse joints Longitudinal joint in wheelpath PM9I-029-F16, N501 Gallows Road Route
19 I-495 Joint Repairs Scope of Work Perform full-depth transverse joint repairs Ty. III Patches 1,325 tons BM HMHB Mill 2 Place 2 SM-12.5E (HP) 5,002 tons Rideability specification 21
20 I-495 Joint Repairs 22
21 I-495 Joint Repairs 23
22 I-495 Joint Repairs 24
23 I-495 Joint Repairs 25
24 I-495 Joint Repairs 26
25 I-495 Joint Repairs 27
26 I-495 Joint Repairs 28
27 I-495 Joint Repairs 29
28 I-495 Joint Repairs 30
29 Hi-Polymer Lessons Learned Binder Stiffer than conventional Short shelf life Good coordination with field crews Field Placement Mix has to be hot (>300 degrees) Ambient temp. has to be hot Temps. very important for SMA (HP) Produce at hot mix temps. Use warm mix additives to aid workability 31
30 Hi-Polymer Lessons Learned SM-12.5E No major issues with placement and compaction Tends to set quickly especially with cooler temperatures SM-9.0E More workable than SM-12.5E (HP) Excellent for shallow joint repair patching SMA-9.5E Most difficult of the mixes to place Hard on equipment Hand work extremely difficult Not recommended for shoulders/ramps 32
31 Hi-Polymer Lessons Learned 2015 Bid Prices (PM9I-96A-F15, N501) Mix Type Quantity Price/ton SMA-9.5 (HP) 6,627 $135 SM-9.0E (HP)* 4,385 $135 SM-12.5E (HP) 31,622 $100 SM-12.5E ---- $84 typ. SM-9.5D ---- $75 typ. 33
32 Hi-Polymer Lessons Learned 2015 Bid Prices (PM9I-96A-F15, N501) Mix Type Quantity Price/ton SMA-9.5 (HP) 6,627 $135 SM-9.0E (HP)* 4,385 $135 SM-12.5E (HP) 31,622 $100 SM-12.5E ---- $84 typ. SM-9.5D ---- $75 typ Bid Prices (PM9I-029-F16, N501) Mix Type Quantity Price/ton SM-12.5E (HP) 5,002 $ SM-12.5E 29,419 $ SM-9.5D ---- $71 typ. 34
33 Moving Forward Contracts/specifications SM-12.5E (HP) good for reflective cracks SM-9.0E (HP) excellent for shallow patching SMA-9.5 (HP) excellent but expensive; do not use on shoulders/ramps Field Performance All mixes performing very well No signs of early reflective cracking SM-12.5E placed in 2015 has already started to crack Continue to review field performance on regular basis Next Steps Review cost effectiveness versus performance 35
34 Future Applications 36
35 And now, the contractor s perspective 37
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