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.
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Erik Updyke & Imelda Diaz: Bonded Wearing Course
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
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
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.