rmeas 2019 mike vothon low volume roads rocky mountain asphalt and equipment show february 28, 2019...

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Pavement Rehab Solutions on Low Volume RoadsRocky Mountain Asphalt and Equipment ShowFebruary 28, 2019

Mike Voth, Pavement & Materials Team Leader

CENTRAL FEDERAL LANDS HIGHWAY DIVISION

Topics▪ Introduction to Central Federal Lands▪ Design Context▪ Project Examples

Guanella Pass Arapaho & Pike NF’s, CO

Central Federal Lands Highway Division

Who We AreFHWA’s road-building

armVisionTo be the partner of choice to Federal Lands Management Agencies and Tribes. We will implement innovativetransportation solutions that provide access to and through public lands.

MissionImproving transportation to and within Federal and Tribal

Lands by providing technical services to thehighway/transportation community, as well as building

accessible and scenic roads that ensure the many nationaltreasures, within our Federal Lands, can be enjoyed by all.

Colorado National Monument

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Federal Lands - Division OfficesCentral Federal Lands Highway Division

675 Employees in HQ and 3 Division Offices

What We Do• Provide Engineering and Construction Services

• Design, Deliver and Construct Projects• Safety Studies/Programs• Transportation Planning• Training & Technology Deployment


FLH Programs• Federal Lands Transportation Program (FLTP)• Federal Lands Access Program (FLAP)• Emergency Relief for Federally Owned Roads (ERFO)

• Tribal Transportation Program (TTP)

Tarryall Creek Rd. Pike NF, CO


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Federal Lands Partner Agencies


Our Funding Levels - FAST ActTwo of our larger funding level programs

FLTP Program 2019

NPS FWS USFS BLM, BOR, USACE Total

$292M $30M $18M $25M $365M

FLAP Program 2019$260M

About $1.5 Billion in funds Annually for all programs


Core Business - To provide highway and transportation facilities on or serving Federally owned land encompassing one-third of the United States.


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Our Settings…

Saguaro National Park


Death Valley National Park


Fire Island National Seashore


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Pennsylvania Avenue – White House


Rehabilitation Design Philosophy

Taylor River Rd.Gunnison NF, CO


Rehab Design Philosophy• Manage Risk

• Unique environmental conditions and constraints• Pressure to build as many miles as possible (low volume

nature of most federal agency’s roadway networks)• Pressure to deliver and construct roads with high quality• Provide long performing pavement for the least amount of

cost


“The single most costly element of of our nation’s highway system is

the pavement structure.”

-AASHTO Pavement Design Guide

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Rehab Design Philosophy


Pavement Rehabilitation:“…structural enhancements that both extend the service life of an existing pavement an/or improve

its load-carry capacity.”

-AASHTO Subcommittee on Maintenance

Rehab Design PhilosophyCommon Pavement Rehabilitation Methods for

CFL


• Asphalt Overlay• Mill & Overlay• Cold in-place Recycling with Overlay

• Full-Depth Reclamation with Overlay• Pulverization (mechanical)• Bituminous (foam &

emulsion)• Cement (chemical)



• Asphalt Overlays – When not to use• Pavements with high severity distresses throughout the project area

• Pavements nearing or at the end of their service life• Pavements that are stripping or show signs of moisture sensitivity

• Pavements that are unstable / shoving

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Rehab Design PhilosophySuitable for overlay Not Suitable for overlay

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Cold In-place Recycling (CIPR)• Rehabilitation of an asphalt pavement using asphalt emulsion

and a recycling train.• Treats pavement distress related to aging of an asphalt

pavement (i.e. thermal cracking)• Very good performance history




CIR Recycling Train

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Rehab Design PhilosophyCentral Federal Lands Highway Division

• CIR Project Selection• Subgrade and base must have the ability to support the

recycling train.• Adequate Geometrics: minimal steep grades and sharp

curves, minimal widening.• Consider economy of scale -project size > 5 mi.• Typical recycling depths for CFL: 3” to 4”



• Full-Depth Reclamation (FDR)• A technique in which the full flexible pavement section and a predetermined portion of the underlying materials are uniformly crushed, pulverized, or blended, resulting in a stabilized base coarse; further stabilization may be obtained through the use of additives. (from ARRA)

• The main piece of equipment is the road reclaimer with a rotor or cutting head that can penetrate through the pavement and into the base.



FDR Reclaimer

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• Full-Depth Reclamation (FDR)• Mechanical Stabilization (with or without addition of virgin aggregate)

• Bituminous Stabilization (emulsified or foamed asphalt)

• Chemical Stabilization (cement, lime, etc.)



• Full-Depth Reclamation (FDR)



• FDR Project Selection• FDR is best suited for low to medium volume roads• The pavement distress should be to the point that a surface

treatment or an overlay is not effective• Minor widening of the road can be easily accommodated• Very weak/wet subgrade cannot be addressed by FDR alone• CFLHD has utilized FDR within a 5” to 10” range, although

greater depths are possible

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Project Examples

Taylor River Rd.Gunnison NF, CO


Hoover Dam, NV


Arches National Park – CIR Project



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• Background• ADT: 2110• 36 mile project, 2-lane road (~20 miles with CIR)• 62,000 tons Superpave pavement• $14,500,000 project• No work allowed on Saturday & Sundays• CIR and asphalt paving operations allowed only at night (full closures allowed from 7 pm to 7 am)

• Contractor required to provide public relations coordinator (high visitor usage / high profile project)



• Design Considerations• Existing pavement was predominantly 3” to 5” in depth

• Subgrade: generally a silty sand (SM, A-2-4) with R-values above 65

• 20 year ESALs: 1,000,000• Pavement Design: 3” Asphalt pavement over 3” CIR



Construction – Night & early morning CIR work

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Construction – Night time placement was successful

Asphalt PavementBottom Lift Cold Recycle

Arches National Park – CIR Project• CIR Mix Design

• Emulsified Asphalt: PASS R (Western Emulsions)• Target Emulsion: 2.5%• Target Water: 2.0%• Target Cement: 1.0%• TSR (AASHTO T 283): 82% (70% min)• Raveling Test (ASTM D7196): 2.1% (5% min)




Asphalt PavementBottom Lift Cold Recycle

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Utah SR 149 – FDR ProjectDinosaur National Monument

Utah SR 149 – FDR Project


• Background• ADT: 830• 4.2 mile project, 2-lane road• 17,000 tons Superpave pavement• $5,500,000 project (included bridge replacement)• Local UDOT District was not experienced with FDR

• Added 4’ shoulders on both sides (32’ total roadway width)

• Swelling clay subgrade known to be area

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• Design Considerations• Existing pavement was predominantly 6” to 8” in depth

• Subgrade: generally a lean clay (CL, A-6) with an average R-value of 12. However, an average of 40 inches of subbase separated clay from pavement

• 20 year ESALs: 560,000• Pavement Design: 3.5” Asphalt pavement over 6” to 9” FDR (mechanical). Plus 30” to 40” inches of existing subbase.

Utah SR 149 – FDR ProjectCentral Federal Lands Highway Division

Drainage improvements


FDR Operations

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Superpave placement


Completed Project


Completed Project

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Performance

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Norris Peak Rd. Black Hills NF, SD

FLHD’s first CIR Project• Location: Rocky Mountain N.P.• Year: 1982• Typical Structural Section

• 4 inches CIR• 2 inches HMA

Rocky Mountain N.P. project ...

…after 26 years!

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First CIR project in California

• Location: Ice House Road (Eldorado National Forest)

• Year: 1988• Typical Structural Section

• 4 inches CIR• 2 inches HMA

• Traffic: 1000 ADT with heavy logging trucks

First CIR project in California20 years & counting!

Twin Lakes Rd - California

CIR

15 years and counting

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Lake Mead National Recreation Area - Nevada

FDR with 3” overlay

15 years and counting

Qu Q Questions??

Red Dirt Bridge White River NF, CO


Golden Gate National Recreation Area

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rmeas 2019 mike vothon low volume roads rocky mountain asphalt and equipment show february 28, 2019...

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