Learn from the experts on the best design and construction practices for Bonded Wearing Course as a pavement preservation strategy, including examples of performance on projects. Erik Updyke, P.E., and Imelda Diaz, P.E., participated in a CalAPA expert panel discussion on the topic.

1. California Asphalt Pavement Association
Spring Asphalt Pavement Conference
April 16, 2015
Erik Updyke, P.E. & Imelda Diaz, P.E.
Los Angeles County Department of Public Works

2.  Pavements were structurally sound.
 Pavements were in fair condition (PCI=70s).
 Distresses were slight to moderate in severity,
occurring intermittently, not extensive, no or slight
rutting.
 Good skid resistance.
 Quick return to traffic desired due to limited
access and high traffic volumes.
 High production/placement rate.
 Reduce work zone exposure time to enhance
worker safety due to high traffic speeds.

3. KANAN ROAD – MULHOLLAND HWY TO 1,296’ N/o SILVER CREEK ROAD ( 5.0 MILES)
KANAN DUME ROAD – 4,360’ N/o CAVALLERI ROAD TO TUNNEL # 1 (2.8 MILES)
KANAN ROAD AND KANAN DUME ROAD

4. SCOPE: COLD MILL ¾” FULL- WIDTH AND RESURFACE WITH BWC
KANAN ROAD AND KANAN DUME ROAD

5. ▶ Rural Major Road
▶ Length: Approximately 5.0 miles
▶ Width: 36 to 60 feet
▶ Pavement Condition Index (PCI): 70-80
▶ Predominant Distress: Moderate longitudinal and transverse
cracking (30%), moderate alligator cracking (10%)
▶ Existing Structural Section: 4.5 to 7 inches of AC on native soil
▶ 10-Year TI: 7.5
▶ Placement Date: April, 2010
▶ FWD Testing (CA Test 356) Data:
 Mean Deflection: 12 mils
 80% Deflection: 16.2 mils
 Tolerable Deflection at Surface: 21 mils
 Since 80% Deflection < Tolerable Deflection, road was structurally
adequate

6. KANAN ROAD (AFTER COLD MILLING)

7. KANAN ROAD (PLACEMENT)

8. KANAN ROAD (MAT)

9. ▶ Rural Major Road
▶ Length: Approximately 2.8 miles
▶ Width: 26 to 60 feet
▶ Average Pavement Condition Index (PCI): 71
▶ Predominant Distress: Moderate longitudinal and transverse cracking
(30%), localized alligator cracking (<10%)
▶ Existing Structural Section: 5 to 8 inches of AC on native soil
▶ 10-Year TI: 8
▶ Placement Date: April, 2010
▶ FWD Testing (CA Test 356) Data:
 Mean Deflection: 9.83 mils
 80% Deflection: 12.72 mils
 Tolerable Deflection at Surface: 20 mils
 Since 80% Deflection < Tolerable Deflection, road was structurally
adequate

10. MM 11.00, S/B LANES
KANAN DUME RD (BEFORE)

11. KANAN DUME ROAD (AFTER)

12. GALE AVENUE - NINTH AVENUE TO TURNBULL CANYON ROAD ( 0.27 MILES)
STIMSON AVENUE -300’ S/o SHADYBEND DRIVE TO COLIMA ROAD (1.81 MILES)
HALLIBURTON ROAD - HACIENDA BOULEVARD TO COLIMA ROAD (1.50 MILES)
COLIMA ROAD, ET AL

13. SCOPE: COLD MILL ¾” FULL- WIDTH AND RESURFACE WITH BWC
COLIMA ROAD, ET AL

14. ▶ Length: Approximately 1.9 miles
▶ Width: Ranges from 60 to 64 feet
▶ Average Pavement Condition Index (PCI): 79
▶ Predominant Distress: Slight to moderate map cracking
▶ Existing Structural Section: 7 inches of AC on 17 inches of CMB
▶ 10-Year TI: 8.5
▶ Placement Date: May, 2010
▶ FWD Testing (CA Test 356) Data:
 Mean Deflection: 15.63 mils
 80% Deflection: 17.95 mils
 Tolerable Deflection at Surface: 13 mils
 AC Overlay Required: 1.33 inches
STIMSON AVENUE
Colima Road to Gale Avenue

15. STIMSON AVENUE

16. STIMSON AVENUE AT SIGMAN
STREET (AFTER COLD MILLING)

17. STIMSON AVENUE AT SIGMAN
STREET (AFTER RESURFACING)

18. ▶ Length: Approximately 1.4 miles
▶ Width: Ranges from 80 to 84 feet
▶ Average Pavement Condition Index (PCI): 68
▶ Predominant Distress: Slight alligator cracking (10%), slight
longitudinal cracking (30%), and slight transverse cracking (10%)
▶ Existing Structural Section: 4 inches of AC on 14 inches of CMB
▶ 10-Year TI: 10
▶ FWD Testing (CA Test 356) Data:
 Mean Deflection: 12.8 mils
 80% Deflection: 20.3 mils
 Tolerable Deflection at Surface: 15.5 mils
 AC Overlay Required: 1.02 inches
HALLIBURTON ROAD
650’ E/o Pontenova Avenue to Colima Road

19. 700’ W/o COLIMA ROAD
HALLIBURTON ROAD

20. HALLIBURTON ROAD (AFTER COLD MILLING)

21. HALLIBURTON ROAD (AFTER RESURFACING)

22.  $125 to $150/ton (8/09 to 2/10)
 Pre-paving meetings are very valuable. Require in your
special provisions.
 Roadway geometrics affect placement. Require
submittal of a “pull-plan.”
 Perform prep work in advance of contract.
 Schedule during favorable weather. Thin lifts cool fast.
 Importance of plant inspection.
 Machine-placement only. Use other mixes for hand
work areas.
 Micro-mill (vs. cold mill) existing pavement.
 Ensure the quantity is large enough to be economical.
 Very smooth ride quality.