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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

     

    Pavement Condition Log

     

    San Joaquin Pavement Condition Survey Log

    Test
    Section
    Description
    Pavement Condition Index
    Average Cost per Lane Mile

    December 2019

    August 2020

    May 2021

    PAVEMENT SECTIONS

    1N

    1-inch Green Asphalt overlay over existing pvmt northbound lane

    100

    92

    81

    $53,400

    1S

    1-inch Green Asphalt overlay with fiber over existing pvmt southbound lane

    100

    89

    78

    $57,400

    2 1-1/4" asphalt overlay (PAB 3, PG 70-22TR) over existing pvmt 100 99 85 $59,000

    3

    2" asphalt overlay PAG 2 over existing pvmt

    100

    100

    97

    $75,500

    4

    2" asphalt overlay PAG 2 with fiber over existing pvmt

    100

    99

    85

    $109,000

    5

    Fog seal, double chip seal Class 1, pulverized & recompact 6" of existing pvmt & subgrade

    92

    90

    83

    $77,500

    6

    Microsurface, chip seal Class 1, pulverized & recompact 6" of existing pvmt & subgrade

    94

    91

    87

    $114,000

    7

    Fog seal, chip seal Class 1, pulverized & recompact 6" of existing pvmt & subgrade

    87

    87

    79

    $54,000

    8

    Fog seal, double chip Class 1 & rubberized chips, pulverized & recompact 6" w/2 lbs cement/sf

    93

    87

    87

    $122,000

    9

    Fog seal, chip Class 1, pulverized & recompact 6" with 1 lbs of cement/sf

    91

    91

    85

    $90,000

    10

    2" mill and fill (PAG 2) over existing pvmt 

    100

    99

    98

    $109,000

    11

    Fog seal, double chip seal Class 1, pulverized & recompact 6" with 2 lbs of cement/sf

    90

    82

    75

    $106,000

    12

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

    92

    91

    89

    $467,500

    SURFACE TREATMENTS

    13

    Fog seal, double chip Class 2/Class 1 over existing pavement

    79

    79

    74

    $37,500

    14

    Fog seal, double chip rubberized precoated chips over existing pvmt

    82

    82

    74

    $22,000

    Performance Curves 

     Test Sections 1 (northbound)

     Test Section 1 northbound

     Test Section 1 (southbound)

     Test Section 1 southbound

     Test Section 2 

    Test Section 2

     Test Section 3

     Test Section 3

     Test Section 4

     Test Section 4

     Test Section 5

     Test Sections 5

     Test Section 6

     Test Section 6

     Test Section 7

     Test Section 7

     Test Section 8

     Test Section 8

     Test Section 9

     Test Section 9

     Test Section 10

     Test Section 10

     Test Section 11

     Test Section 11

     Test Section 12

     Test Section 12

     Test Section 13

     Test Section 13

     Test Section 14

     Test Section 14

    Photographs

    South San Joaquin Road - Pima County

    (Hover or Tap image above for more options.)

    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) conduct pavement condition assessment survey.
    August 2020 Infrastructure Management Services (IMS) conducted pavement condition assessment survey.
    May 2021  Infrastructure Management Services (IMS) conducted pavement condition assessment survey.
    July 2021 Memorandum of July 14, 2021 to County Engineer on program status.

     

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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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