COUNTY OF SAN DIEGODEPARTMENT OF PUBLIC WORKS

County of Los Angeles Public works2015 Sustainable Pavement Round Table

February 10, 2015

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Agenda: County of San Diego

Introduction to Pavement Network Selection Criteria for Resurfacing Pavement Preservation Projects Pavement Recycling Projects Subgrade Stabilization projects

Use of Reclaimed Asphalt Pavement

Lessons Learned Sustainable Implementation

challenges Other information

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Map of SD County Supervisorial Districts

SD 5

SD 3

SD 4

SD 1

SD 2

SD CL MI

1 64.95

2 1,072.45

3 84.83

4 0.56

5 717.00

Total 1,939.79

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PAVEMENT NETWORK - CONDITIONCOUNTY OF SAN DIEGO

2012 Average PCI = 64 (Unincorporated Areas of County of San Diego)

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MicroPaver®

Community Planning Group Priorities Road crew priorities / Customer Concerns Distribution of funding by Supervisorial

District lane mile percentages Street Saver® starting July 1, 2015

Selection Criteria Maintenance ProjectsCOUNTY OF SAN DIEGO

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Department Wide: Fog Seal (shoulders and berms) Slurry Seal ( Type 2 & 3)

Conventional Polymer Modified REAS TRMSS

Chip Seal (Medium-fine & Medium) Conventional Polymer Modified

Road Crews Localized Repairs Skin Patching Crack Sealing

PAVEMENT PRESERVATION: Projects & Rd CrewsCOUNTY OF SAN DIEGO

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Advance planning to focus on pavement preventative maintenance

PAVEMENT PRESERVATION PROJECTSCOUNTY OF SAN DIEGO

Chip Seal Cape SealSlurry Seal

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Slurry Seal –Via Del Charro, Rancho Santa Fe 0.49 mile Type 2 Slurry Seal including digouts

PAVEMENT PRESERVATION – SLURRYCOUNTY OF SAN DIEGO

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Chip Seal – Honey Springs Road, Jamul 2 mile scrub seal including flush coat and digouts

PAVEMENT PRESERVATION – CHIP SEALCOUNTY OF SAN DIEGO

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Cape Seal, Bonita Glen Terrace, Bonita (Micromill, Scrub Seal with Type II) Rejuvenating Sealer with 5/16” chips

PAVEMENT PRESERVATION - CAPECOUNTY OF SAN DIEGO

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COSD has not used Cold In-Place Recycling (CIR) or Cold Central Plant Recycling (CCPR)in recent years

14/15 AC Overlay Contract has initial CIR project - Dehesa Road (2.23 miles) 3” CIR with 1.5” cap of MAC 15-TR

With success on Dehesa Road, we expect to increase our use of CIR in future contracts

COSD considers CIR and CCPR reconstruction/rehabilitation rather than preventative maintenance.  

We are assessing the cost-effectiveness of CCPR as part of our Preventative Maintenance Program

We are beginning to stockpile AC grindings from mill/fill projects for general re-use by road crews.

PAVEMENT RECYCLING PROJECTSCOUNTY OF SAN DIEGO

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Current staff has minimal experience with the use of these processes.

In general, we are moving away from removing all existing AC. Many rural roads do not have engineered structural section complicating recycling.

Require experienced contractors We would consider these treatments for large

segments of existing road with substantial subgrade issues

Use alternate methods such as overlay and fabric rather than removal of entire structural section

We would address this issue via our Capital Improvement Program Project Development Section

SUBGRADE STABILIZATION PROJECTSCOUNTY OF SAN DIEGO

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USE OF RECLAIMED ASPHALT PAVEMENTCOUNTY OF SAN DIEGO

Allow for RAP in all asphalt resurfacing projects (up to 15%) per 2010 Caltrans Standard Specifications Section 39-1.02F, “Reclaimed Asphalt Pavement”

We are developing a RAP program that includes: Chip Seals Build a stockpile of grindings for future sustainable

projects All road crews to use the stockpile for backfilling local

repairs, shoulder backing, etc…

14 Expectations: What performance or life cycle do you

expect from a specific treatment Consider all Options: Conventional AC may be the

most appropriate treatment for some applications We need to become more knowledgeable regarding

limitations and benefits of sustainable treatments Experienced and knowledgeable construction

inspector staff is critical to the success of sustainable treatment use

Road Crews: Most knowledgeable about their roads

LESSONS LEARNEDCOUNTY OF SAN DIEGO

15 Flat revenues New regulations (ADA requirements) Drain on Road Fund: emergencies/natural

disasters Standard specifications to support new

procedures Staffing shortages 

CHALLENGES ENCOUNTEREDCOUNTY OF SAN DIEGO

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OTHER INFOCOUNTY OF SAN DIEGO

Preventative Maintenance Project Team Advanced Planning: Road Maintenance Geotechnical: CIP Materials Lab Project Management: CIP Project Development Construction: CIP Construction Inspection

Maintenance Contracts allow for 3 different types of seals. Contractor selects and bids appropriately: TRMSS REAS RPMS

Warm Mix asphalt Placed a test section on a high volume road. So far

operating adequately

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