Erik Updyke & Imelda Diaz: Bonded Wearing Course

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

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.

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

SCOPE: COLD MILL ¾” FULL- WIDTH AND RESURFACE WITH BWC

KANAN ROAD AND KANAN DUME ROAD

▶ 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

KANAN ROAD (AFTER COLD MILLING)

KANAN ROAD (PLACEMENT)

KANAN ROAD (MAT)

▶ 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

MM 11.00, S/B LANES

KANAN DUME RD (BEFORE)

KANAN DUME ROAD (AFTER)

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

SCOPE: COLD MILL ¾” FULL- WIDTH AND RESURFACE WITH BWC

COLIMA ROAD, ET AL

▶ 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 AVENUEColima Road to Gale Avenue

STIMSON AVENUE

STIMSON AVENUE AT SIGMAN STREET (AFTER COLD MILLING)

STIMSON AVENUE AT SIGMAN STREET (AFTER RESURFACING)

▶ 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 ROAD650’ E/o Pontenova Avenue to Colima Road

700’ W/o COLIMA ROAD

HALLIBURTON ROAD

HALLIBURTON ROAD (AFTER COLD MILLING)

HALLIBURTON ROAD (AFTER RESURFACING)

$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.