Pavement Treatment Testing

Pavement Treatment Testing - San Joaquin Road

A 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

• Construction Plans San Joaquin

Specifications

• 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 

 

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.