Post on 01-Jun-2020
Current
APT at CRRELCurrent
APT at CRREL
Edel R. Cortez, P.E.Research Civil Engineer
ERDC - CRREL
For presentation at the HVSIA August 2005 meeting in South Africa
ERDC – CRREL:Cold Regions Research and Engineering Laboratory
Hanover, NH
Current APT
• Pavement Subgrade Performance for New Mechanistic Design19 states + FHWA
• Geogrid Base Course Reinforcement to Extend Pavement Life9 states + FHWA
Current Research Projects
• Pavement Subgrade Performance for New Mechanistic Design19 states + FHWA
• Geogrid Base Course Reinforcement to Extend Pavement Life9 states + FHWA
Pavement Subgrade Performance Study
National Pooled Fund StudySPR2-(208)
Principal InvestigatorEdel R. Cortez, P.E.
OhioMontanaNebraskaIdahoNorth Dakota
PennsylvaniaCaliforniaTexasNew HampshireConnecticut
New YorkKansasFloridaMinnesota
IndianaAlaskaAlabamaGeorgiaOregon
Texas Transportation Research Institute
Cornell UniversityKansas State UniversityLouisiana State
UniversityUniversity of MarylandUniversity of New
Hampshire
Cold Regions Research and Engineering Laboratory
Current APT
Pavement Subgrade Performance Study
Cold Regions Research and Engineering Laboratory
• 12 full-scale test sections• 6 test windows per test section• Thin flexible pavements• Tested to failure (12.7 mm rutting)
Asphalt Concrete (76mm)
Crushed Aggregate Base (229mm)
Test Subgrade (3m)
Deliverable Products
Subgrade failure criteriaPavement Subgrade ModelsDatabase
Experimental Research+
Analytical Research
Project Cost: $2.3 million
Asphalt behavior:viscous, plastic, and elastic components.
AC
Base
Subgrade
Coarse grained base course:particulate slips and rotations.
Subgrade fine-grained soils:Cohesive or non-cohesiveElastic, plastic, and viscous components.
Material properties are modified by temperature and moisture.
TrafficLoads
ClimateCRREL’s FROST model
built into Enhance Climatic Model
Material Properties(adjusted for temperature and moisture effects)
Design Complete
Layer Thickness
Discretization
Response Models:σ , ε, δ
Performance Models:Rutting, fatigue cracking, faulting,
thermal cracking, roughness.
ResultsIs design adequate?
No
Yes
ERDC-CRREL contributions to the
AASHTO*Mechanistic-
Empirical Design Method
* AASHTO = American Association of State and Transportation Officials
AASHTO M-E Framework
• Pavement Subgrade Performance for New Mechanistic Design19 states + FHWA
• Geogrid Base Course Reinforcement to Extend Pavement Life9 states + FHWA
Current APT
Geogrid Base Course Reinforcement
National Pooled Fund Study
MaineNew HampshireTexasNew YorkWashington
KansasMinnesotaConnecticutVermont
University of MaineUniversity of New
Hampshire
Cold Regions Research and Engineering Laboratory
Current Research:
Geogrid Base Course Reinforcement
Cold Regions Research and Engineering Laboratory
• 2 full-scale test sections• 8 test windows per test section• Flexible pavements• Tested to 100K overload passes.
Conclusions• ERDC-CRREL is fully engaged in pavements R&D with US state
departments of transportation• The Frost Effects Research Facility (FERF) at ERDC-CRREL in
Hanover, NH specializes in APT where moisture and temperature controls are desirable.
• ERDC-CRREL HVS was designed to simulate heavy highway traffic.• ERDC-GSL HVS was designed to simulate heavy aircraft traffic.
Conclusions• ERDC-CRREL is fully engaged in pavements R&D with US state
departments of transportation• The Frost Effects Research Facility (FERF) at ERDC-CRREL in
Hanover, NH specializes in APT where moisture and temperature controls are desirable.
• ERDC-CRREL HVS was designed to simulate heavy highway traffic.• ERDC-GSL HVS was designed to simulate heavy aircraft traffic.
Conclusions• ERDC-CRREL is fully engaged in pavements R&D with US state
departments of transportation• The Frost Effects Research Facility (FERF) at ERDC-CRREL in
Hanover, NH specializes in APT where moisture and temperature controls are desirable.
• ERDC-CRREL HVS was designed to simulate heavy highway traffic.• ERDC-GSL HVS was designed to simulate heavy aircraft traffic.
Conclusions• ERDC-CRREL HVS was designed to simulate heavy highway traffic.• ERDC-GSL HVS was designed to simulate heavy aircraft traffic.• GSL and CRREL are components of the U.S. Army Corps of Engineers
Engineer Research and Development Center (ERDC)
Conclusions• ERDC-CRREL HVS was designed to simulate heavy highway traffic.• ERDC-GSL HVS was designed to simulate heavy aircraft traffic.• GSL and CRREL are components of the U.S. Army Corps of Engineers
Engineer Research and Development Center (ERDC)
Current
APT at CRRELCurrent
APT at CRREL
Edel R. Cortez, P.E.Research Civil Engineer
ERDC - CRREL
For presentation at the HVSIA August 2005 meeting in South Africa