De-Bonding of HMA Pavements/Construction Observations

Construction Observations of Some Washington State Projects

The following section presents tack coat application photos and noted overlay construction issues from various WSDOT contracts. These photos and notes are intended to serve as a preliminary collection of data to be used in identifying construction practices and conditions that lead to de-bonding and bottom-up cracking. Information from these specific contracts has been added to this database because WSDOT personal noticed either pickup or questionable applications of tack during construction.

Contract 6772, 6749 and 6688

  • The following were done in 2004:
  • C#6772, SR 503, MP 13.82 – 29.96, Rock Creek Rd Vic. to Ham Rd Vic. (Some pickup noticed)
  • C#6749, SR 12, MP 134.28 – 165.98, Lake Creek to Wildcat Creek
  • C#6688, SR 97A, MP 201.57 – 214.20, Wenatchee North Paving
  • Contract Locations

Contract #6772


Tack Coat 1
Figure 1: Tack Coat 1

Tack Coat 2
Figure 2: Tack Coat 2

Tack Coat 3
Figure 3: Tack Coat 3

 Contract #6749

Tack Bar 1
Figure 4: Tack Bar 1

Tack Bar 2
Figure 5: Tack Bar 2

Tack Coat 1
Figure 6: Tack Coat 1

Tack Coat 2
Figure 7: Tack Coat 2

Contract #6688


Tack Coat
Figure 8: Tack Coat 1

Tack Coat
Figure 9: Tack Coat 2

Tack Coat
Figure 10: Tack Coat 3

Tack Coat
Figure 11: Tack Coat 4

Figure 12: Tack Coat 5

Contract 6059, 6098 and 6143

  • Projects were completed in 2001:
  • C#6059, SR 395, MP 45.36 – 61.24, SR 17 to Adams Co. Line (Light tack on Oxidized surface (Pepper application)).
  • C#6098, SR 4, MP 0 – 28.2, Jct. SR 101 to West Valley Creek (Tack truck had issues and needed repeated applications to get coverage).
  • C#6143, SR 101, MP 321.7 – 329.07, Jorsted Creek Vic. to Sund Creek (Some pickup was seen)
  • Contract Locations

Contract #6059

Tack Coat
Figure 13: Tack Coat 1

Tack Coat
Figure 14: Tack Coat 2

Tack Coat
Figure 15: Tack Coat 3

Contract #6098


Poor Tack
Figure 16: Poor Tack C

Poor Tack
Figure 17: Over Tack A

Figure 18: Poor Tack 2A

Poor Tack
Figure 19: Poor Tack 2B

Poor Tack
Figure 20: Poor Tack B

Puddle Tack
Figure 22: Puddle Tack A

Puddle Tack
Figure 23: Puddle Tack B

Uneven Tack
Figure 24: Uneven Tack B

Uneven Tack
Figure 25: Uneven Tack C

Contract #6143

Tack Coat
Figure 26: Tack Coat 1

Tack Coat
Figure 27: Tack Coat 2

Contract 5816

  • Contract 5816, SR 500, MP 8.37-20.37, NE 162nd to SR 14 Vic
  • Class A PG 64-22, 0.15′ mill and overlay
  • Paved in 2000 (6/20 – MP limits that day were 19.1-19.7)
  • Project Bid Tab
  • Comments: streaked tack coat on milled surface

Contract #5816

Close Up Tack
Figure 28: Close Up Tack

Tack Truck
Figure 29: Tack Truck 2

Tack Truck
Figure 30: Tack Truck 3

Spray Bar
Figure 31: Spray Bar

Tack Coat
Figure 32: Tack Coat 1

Tack Coat
Figure 33: Tack Coat 2

Tack Pick Up
Figure 34: Tack Pick Up

Tack Tracks
Figure 35: Tack Tracks

Tack Truck
Figure 36: Tack Truck 1

Pothole
Figure 37: Pothole 2

Shoulder, no tack
Figure 38: Shoulder, no tack

Contract 5700

  • Contract 5700, SR 101, MP 249-252, Golf Course Road to Morse Creek
  • Class A PG 58-22, 0.15′ (actual was ~2″)
  • Paved in 2000 (6/26)
  • Project Bid Tab
  • Comments: over clean prelevel, thin coat, fairly uniform, CSS-1 w/10% dilution

Contract #5700


Close Up Milled
Figure 39: Close Up Milled

Tack Close Up
Figure 40: Tack Close Up

Tack Coat
Figure 41: Tack Coat 1

Tack Coat
Figure 42: Tack Coat 2

Tack Coat
Figure 43: Tack Coat 3

Tack Coat
Figure 44: Tack Coat 4

Tack Coat
Figure 45: Tack Coat 5

Tack Coat
Figure 46: Tack Coat 6

Tack Coat
Figure 47: Tack Coat 7

Tack Coat
Figure 48: Tack Coat 8

Tack Coat
Figure 49: Tack Truck 1

Contract 5831

  • Contract 5831, SR 2/97, MP 117.15-119.17, Lower Sunnyslope to Easy St
  • Class A PG 64-34, 0.15′
  • Paved in 2000 (7/12)
  • Project Bid Tab
  • Comments: CSS-1 w/ ~10% dilution, even distribution, double coverage

Contract #5831

Close Up Tack
Figure 50: Close Up Tack

Spray Bar
Figure 51: Spray Bar

Tack Coat
Figure 52: Tack Coat 1

Tack Coat
Figure 53: Tack Coat 2

Tack Coat
Figure 54: Tack Coat 3

Tack Coat
Figure 55: Tack Coat 4

Tack Coat
Figure 56: Tack Coat 5

Tire Pick Up
Figure 57: Tire Pick Up 1

Tire Pick Up
Figure 58: Tire Pick Up 2

Contract 5677

  • Contract 5677, SR 12, MP 118-134, Surrey Creek to Lake Creek Road
  • Class 1/2″ PG 64-28, 0.15′
  • Paved in 2000 (8/1)
  • Project Bid Tab
  • Comments: tack very light (not even sticky on shoes)

Contract #5677

Tack Coat
Figure 59: Tack Coat 1

Tack Coat
Figure 60: Tack Coat 2

Tack Coat
Figure 61: Tack Coat 3

Contract 5827

  • Contract 5827, SR 5, MP 70.9-85.51, SR 508 to Thurston Co Line
  • Class A PG 64-22, 0.15′
  • Paved in 2000 (8/17)
  • Project Bid Tab
  • Comments: tack very streaky and not broken

Contract #5827

Tack Coat
Figure 62: Tack Coat 1

Tack Coat
Figure 63: Tack Coat 2

Tack Coat
Figure 64: Tack Coat 3

Contract 5841

  • Contract 5841, SR 27, MP 75.66-83.10, Freeman to Vic 32nd Ave
  • Class 1/2″ PG 64-28, 0.15′ mill and overlay
  • Paved in 2000 (6/27)
  • Project Bid Tab
  • Comments: STE-1 used, uniform over milled surface, picking up in wheelpaths (still in valleys of milled surface)

Contract 5807

  • Contract 5807, SR 542, MP 21.41-30.92, Hatchery Rd to Nooksack River Bridge
  • Class B PG 64-22, 0.12′
  • Paved in 2000 (7/19)
  • Project Bid Tab
  • Comments: very light tack on new prelevel

Contract 5862

  • Contract 5862, SR 14, MP 114.06-134.29, Goodnoe Rd to Wood Creek/Alderdale Rd
  • Class A PG 64-28, 0.15′
  • Paved in 2000 (7/27)
  • Project Bid Tab
  • Comments: CSS-1 over prelevel, streaky (told application rate was 0.05-0.08)

Contract 5609

  • Contract 5609, SR 395, MP 241.73-248.54, Columbia River Bridge to Boyds
  • Class B PG 58-34, 0.15′ mill and overlay
  • Paved in 1999 (date visited was 6/9)
  • Project Bid Tab
  • Comments: tack coat looked very good

Contract 5701

  • Contract 5701, SR 14, MP 11.88-21.77, 6th Ave to Clark Co Line (Contract Location)
  • Class A PG 64-22, 0.20′ overlay
  • Paved in 1999 (9/7)
  • Project Bid Tab
  • Comments: streaked tack coat

Contract 7060

  • Contract 7060, SR 17 (just south of SR 26) – severe delamination during milling.
  • Project Bid Tab
  • I recall that on I-5 Maytown project, Mel was out there and made them put two coats on a milled surface and it wouldn’t break because there was too much tack and it was a relatively cool night. (Jim, do you have pics?)
  • Also, I think Jim Weston may have some pictures, but I think on I-90 (contract 6136 or 6151) there was some extreme pick up of the tack in the wheelpaths. Jim will probably have some of the better notes when it comes to tack coat…

De-bonding on the Moanalua Freeway

This is some brief evidence from the State of Hawaii based on cores taken on the Moanalua Freeway.De-bonded pavement cores taken from Moanalua Freeway Ramp 68

Contract #5816

Boring
Figure 65: Boring 1

Boring
Figure 66: Boring 2

Boring
Figure 67: Boring 3

Boring
Figure 68: Boring 4

Boring
Figure 69: Boring 4A

Boring
Figure 70: Boring 5

Contract #5816

Boring
Figure 71: Boring 6