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  • Pavement Treatment Testing

    Pavement Treatment Testing - San Joaquin Road

    PavingA 4.3-mile section of San Joaquin Road between Old Ajo Highway and Milky Way Drive has been selected as a testing ground for several pavement treatments.. 

    Treatments will be tested for various factors to ascertain life-cycle return on investment leading to more cost-effective selection of pavement treatments for use in Pima County testing.

    The treatments will be laid in multiple 1,000-foot test sections covering both directions of traffic. Pima County will group the treatments by color and texture to minimize the visual patchwork. The balance of the roadway will be repaved by removing 2 inches of existing asphalt and replacing it with 2 inches of traditional asphalt. The result will be the complete repair of a 4.3-mile section of roadway that has fallen into poor condition.

    The Department will evaluate the wear to test segments every six months, and forecast performance each treatment over time. The County will also study the road over several years to determine the best, most cost-effective and long-term treatment options. Construction is scheduled for this summer with treatments to include:

    • Section 1: 1-inch Green Asphalt overlay with fiber southbound lane only 
    • Section 2: 1-inch PAG 3 terminal blend overlay
    • Section 3: 2-inches PAG 2 overlay
    • Section 4: 2-inches PAG 2 with fiber overlay
    • Section 5: Pulverize 6-inches existing and compact with double chip seal & fog seal
    • Section 6: Pulverize 6-inches existing and compact with single chip seal & micro surface
    • Section 7: Pulverize 6-inches existing and compact with single chip seal & fog seal
    • Section 8: Pulverize 6-inches existing and compact cement treated (300 psi) with chip seal & rubberized (terminal blend) chip seal & fog seal
    • Section 9: Pulverize 6-inches existing and compact cement treated (150 psi) with chip seal & fog seal
    • Section 10: 2"-inches PAG 2 mill & fill
    • Section 11: Pulverize 6-inches existing and compact cement treated (300 psi) with chip seal & fog seal
    • Section 12: 6-inches roller compacted concrete
    • Section 13: Double chip seal overlay & fog seal
    • Section 14: Rubberized (terminal blend) single chip seal overlay & fog seal

    Evaluation of the test treatments are scheduled to occur six months post construction and at annual intervals thereafter. Observations will include: cracking, rutting, oxidation, surface wear and roughness, supplemented by the regional Pima Association of Governments/City of Tucson Automated Road Analyzer van and additional laboratory tests as needed.

    Treatment-specific curves will be developed based on data from each evaluation interval to rank treatment benefit-cost projection based on standardized return on investment criteria. These curves will be correlated against longer-term national research data for that treatment type, to infer longer term performance from shorter observation periods. The treatment curves will be controlled to account for minor localized variations in soil or drainage conditions.

    Construction Plans

    Specifications

     

    Inspection Log

     

    San Joaquin Inspection Log As of June 1, 2020

    Section ID
    Section Description
    Pavement Condition Index (PCI)
    Average Cost per Lane Mile

    Applied 12/18/2018

    IMS 



    12/23/2019

    Next Inspection To Be Determined

    1

    1" Green Asphalt Overlay over existing pvmt (fiber added to southbound lane)

    100

    84

     

    $78,500

    2

    1-1/4" Asphalt Overlay (PAG 3, PG70-22TR) over existing pvmt 

    100

    84

     

    $130,000

    3

    2" Asphalt Overlay PAG 2 over existing pvmt

    100

    83

     

    $158,500

    4

    2" Asphalt Overlay PAG 2 with fiber over existing pvmt

    100

    85

     

    $174,000

    5

    Fog seal, dbl chip seal-Class 1 & 2, Pulverized & recompacted 6" of existing pvmt & subgrade

    100

    85

     

    $137,000

    6

    Micro Surfacing, Chip Seal-Class 1, pulverized & recompacted 6" of existing pvmt & subgrade

    100

    82

     

    $175,500

    7

    Fog seal, chip seal-Class 1, Pulverized & recompacted 6" of existing pvmt & subgrade

    100

    89

     

    $118,000

    11

    Fog seal, chip seal-Class 1, Pulverized & recompacted 6" of existing pvmt & subgrade, 2 lbs cement/sf

    100

    89

     

    $54,500

    8

    Fog seal, dbl chip seal-Rubberized Chips & Class 1, Pulverized & recompacted with 2 lbs of cement/sf

    100

    83

     

    $181,500

    9

    Fog seal, dbl chip seal-Rubberized Chips & Class 1, Pulverized & recompacted with 1 lbs of cement/sf

    100

    88

     

    $149,500

    13

    Fog seal, dbl chip seal (Class 2/Class 1) over existing pvmt

    85

    69

     

    $97,500

    14

     Fog seal, chip seal-rubberized precoated chips over existing pvmt

    91

    76

     

    $82,000

    10

    2" Mill and Fill (PAG 2)

    100

    83

     

    $205,000

    12

    6" Roller compacted concrete, remove 4-inches below existing top of pavement

    100

    68

     

    $526,500

     

    Performance Curves 

     Test Sections 1-4

      Performance Curves

     Test Sections 5-8

     Performance Curves

     Test Sections 9-12

     Performance Curves

    Test Sections 13-14

     Performance Curves

     

    Progress Update

    SAN JOAQUIN PAVEMENT TREATMENT TESTING PROGRAM

    PIMA COUNTY DEPARTMENT OF TRANSPORTATION

    PROGRESS UPDATE

    Date

    Description

    April 2018

    Development of drawings and specifications started.
    June 2018

    Drawings/Specifications completed and sent out to bid.

     August 2018 Southern Arizona Paving awarded contract. Total Estimate Cost = ±$1.1M 
     September 2018 Construction started.
     December 2018 Construction completed.



    March 2019 Visual inspection of roller compacted concrete test section conducted by Jim Cunningham, DOT Deputy Director (Memorandum): Surface in good condition. Profile not as smooth as asphalt but is considered adequate for the speed.  
    December 2019 Infrastructure Management Services (IMS) under contract with the Department of Transportation to conduct pavement condition assessment of San Joaquin test sections (ARAN). 
    March 2020 PCI values from IMS's pavement condition assessment run on 12/23/2019 received.  
    September 2020 Infrastructure Management Services (IMS) under contract with the Department of Transportation to conduct pavement condition assessment of San Joaquin test sections (ARAN) in September 2020 and first part of 2021.  

     

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    Transportation

    Ana M. Olivares, P.E.
    Director

    201 N. Stone Ave., 4th Fl.
    Tucson, AZ 85701

    (520) 724-6410


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