frost effects research facility - hvsia.com appendix f da.pdfcold regions research & engineering...

US Army Corpsof Engineers ®

Cold Regions Research &Engineering Laboratory

Frost Effects Research Facility

Accelerated Pavement Testingat CRREL

September 2006 Updateby

Edel Cortez



FERF as a part of the US Government

Department of DefenseDepartment of Defense

Army Navy Air Force

Corps of Engineers

ERDC (R&D)

CRREL

FERFFERF



FERF Facilities



FERF Current Projects

1. Subgrade Performance Study

2. Geogrid Base Course Reinforcement

Scheduled for completion in January 2007.

Scheduled for completion in August 2007.



Pavement Subgrade Performance Study

National Pooled Fund StudySPR2-(208)

OhioMontanaNebraskaIdahoNorth Dakota

PennsylvaniaCaliforniaTexasNew HampshireConnecticut

New YorkKansasFloridaMinnesota

IndianaAlaskaAlabamaGeorgiaOregon

CTORKatherine PetrosFHWA

Texas Research InstituteCornell University

Principal InvestigatorEdel Cortez



Mechanistic Design Process

Material Properties

(Elastic,Plastic, Viscous,etc)

Stress, StrainDisplacement

Failure Criteria

PerformanceModels

Met ?

Pavement Structure

ClimaticEffects

Load History(Traffic)

Analytical ToolsMulti-layered,

FEM

EndYes

No



Test Matrix

The fine content (-#200 sieve) must be > 35%

CH

A-7-6

MLML

CL

OHorMH

PI = 0.

73(L

L-20)

A-7-5

A-5A-4

A-6“U” li

ne, upper

limit o

f plas

ticity per

Casagran

de

“A” l

ine

PI = 0.9(LL-8)

The fine content (-#200 sieve) must be > 35%

CH

A-7-6

MLML

CL

OHorMH

PI = 0.

73(L

L-20)

A-7-5

A-5A-4

A-6“U” li

ne, upper

limit o

f plas

ticity per

Casagran

de

“A” l

ine

PI = 0.9(LL-8)

CompletedIn progress

Sept 2004 Status1500

1550

1600

1650

1700

1750

1800

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30Gravimetric Moisture Content (%)

Dry

Uni

t Wei

ght (

kg/m

3 )

0

10

20

30

40

50

60

70

CB

R (%

)

Dry Unit WeightCBR

TS 712

TS 711



Full-scale test sections and APT

• Twelve full-scale test sections tested with CRREL’s HVS.• Each test sections has 6 test windows.• Four subgrade soil types: A-2-4, A-4, A-6 and A-7-5• Instrumented with temperature, moisture, stress and strain sensors.



Products

Subgrade failure criteriaModel developmentDatabase



Past, Present and Future

Generic failure criterionBased on elastic vertical

strain on top of subgradeOne place, one soil, mixed

seasons, surface rut only.

Old

Failure criteria according to soil type and moisture based on elastic, plastic strainsImproved subgrade modelsUnder controlled moisture and

temperature

New

Base course failure criteriaImproved base course models

Future



Current Projects

1. Subgrade Performance Study

2. Geogrid Base Course Reinforcement



Project Overview

TPF 5(010): Structural Improvement of Flexible Pavements Using Geosynthetics for Base Course Reinforcements

This is a pooled-fund study coordinated by the FHWA.

Maine is the lead State.



Project Objectives

Can this solve this?Quantitative cost-benefit ratio?



Past Projects

1. Variable Tire Pressure Effects

2. Expedient Soil Stabilization

3. Reinstatement of Utility Cuts



Future Projects

1. Base Course Performance

2. Validation of the AASHTOMechanistic-Empirical Design Method

3. Reinstatement of Utility Cuts

4. Your ideas



Thank you

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