validation

asphaltmodelsetg.org

validation

WESTERN RESEARCH INSTITUTE

Providing solutions to highway building materials problems

FUNDAMENTAL PROPERTIES

OF ASPHALTS AND MODIFIED

ASPHALTS III

FIELD VALIDATION

Michael Harnsberger

Fundamental Properties and Advanced Models ETG

Denver, CO

July 24, 2007


FUNDAMENTAL PROPERTIES… III

SUBTASK 2.6 - FIELD VALIDATION

BACKGROUND

• Constructed pavement sections with the major

variable being the crude oil source of the asphalt.

• Collected reasonable quantities of all materials.

• Monitor constructed sections for performance

annually.

• Pavement material samples are used to directly

compare, calibrate, and validate test methods and

models that measure performance.

• Comparison between different sites may be

difficult at best.


FUNDAMENTAL PROPERTIES… III

SUBTASK 2.6 - FIELD VALIDATION

WORK PLAN

• Continue monitoring pavement section

performance annually

• Obtain core samples as necessary

• Review utility and availability of Asphalt

Institute PPA sections


FUNDAMENTAL PROPERTIES… III

SUBTASK 2.6 - FIELD VALIDATION

• Albin WY site constructed in June 1999

2 asphalt sources. (cold-dry site)

• Nevada I-15 site constructed September 2001

4 asphalt sources. (hot-dry site)

• Arizona U.S. 93 site constructed November 2001

4 asphalt sources. (hot-dry site)

• Kansas U.S. 77 site constructed May 2002

4 asphalt sources. (hot-wet site)

• Minnesota CR 112 site constructed August 2006

4 asphalt sources. (cold-wet site)


AZ1-1A

LAYOUT FOR ARIZONA U.S. 93 SITE

….

AZ1-1B

….

AZ1-2A

….

Passing Lane

AZ1-1

AZ1-2B

Direction of traffic (southbound)

….

….

AZ1-1 AZ1-2 AZ1-3 AZ1-4

AZ1-3A

….

Core Locations

AZ1-3B

….

AZ1-4A

….

AZ1-4B

….


PERFORMANCE MONITORING

OF FIELD SITES

• All sections are monitored using LTPP

Distress Survey protocols

• Monitoring consists of distress mapping &

classification, transverse profiles, and photos

• Sections monitored annually

• Core samples obtained post construction and

after 1, 2, and 5 years of service

• Pavement distress may trigger the need for

core samples in off years


PERFORMANCE MONITORING

OF FIELD SITES


PERFORMANCE MONITORING

OF FIELD SITES


PERFORMANCE MONITORING

OF FIELD SITES


DISTRESS DATA FOR ARIZONA

SECTIONS

AFTER 5 YEARS IN SERVICE

Fatigue

Longitudinal Cracking, m

Asphalt Cracking, m Wheel Path Non-Wheel Path

2

Transverse

Cracking, m

AZ1-1 1.9 58.4 205.2 12.6 (9)

AZ1-2 1.7 12.0 83.4 0.2 (1)

AZ1-3 12.2 10.2 8.3 0.5 (1)

AZ1-4 15.8 4.7 74.9 33.4 (32)

Average of 2 500-foot monitoring sections


FUNDAMENTAL PROPERTIES… III

SUBTASK 2.6 - FIELD VALIDATION

QUESTIONS ?


ASPHALT RESEARCH CONSORTIUM

VALIDATION

Fundamental Properties and Advanced Models ETG

July 24, 2007


VALIDATION

• Establish Material Library

– Current validation site materials

– Review SHRP library (mainly aggregate)

– Geographic area of use

– Volume of use

– Fundamental property differences

– Mineralogical differences

– Availability

– Suggestions by ETG, FHWA, State DOT, etc.

– Other?


VALIDATION

• Work Elements in Three Categories

– Field Validation

– Accelerated Pavement Testing

– R&D Application


Field Validation

VALIDATION

• Construct and Monitor new validation sites in cooperation

with State DOT’s

– Incorporate NDT and spatial variation of materials if possible

• Warm mix sections in Yellowstone NP

– 10,000 tons each of HMA, Sasobit, and Aspha-Min

– Collect all construction materials

– Record locations of different materials

– Establish 500 foot monitoring sections within each material

– Monitor performance annually


Field Validation

VALIDATION

• Assess effects of surface treatment of AZ sections

• Collect materials from MNRoad PPA sections

– Asphalt + PPA + lime

– Asphalt + SBS + PPA + lime

– Asphalt + SBS + lime

– Asphalt + Elvaloy + PPA + lime

– MnDOT to Monitor performance


Field Validation

VALIDATION


VALIDATION

Accelerated Pavement Testing

• Accelerated Loading using One-Third Scale Load

Simulator

– Accurate control of Loading

• Construction of Sections at the Pecos RTC

– Investigate the Possibility of Using the Facility

• Other APT Sites/Sections


R&D Application

VALIDATION

• Continual Assessment of Specifications

– Assess Applicability of Research Products for

Improvements to PG Grading System

– Reduce/eliminate “PG Plus” tests

– Revise AASHTO M320, M323, and MP8

• Validation through MEPDG Sites

– Provide Additional Testing for States

– Test and Performance Data Used to Validate Models

– Review Asphalt Materials Models – Revise If Needed

– Evaluate Applicability of Models for Polymer-modified

Asphalts


VALIDATION

Category Specific Work Element

Construct and monitor sites in

Field cooperation with State DOT’s

Validation Obtain WMA materials from YNP,

establish and monitor sections

Accelerated

Pavement

Testing

R&D

Application

Third-Scale Model Mobile Load

Simulator

Construct sections at the Pecos RTC X

Other APT opportunities

Validation through MEPDG Sites and

Evaluation of the MEPDG Asphalt

Materials Models

Consortium Partner

WRI TTI UWM UNR AAT

Continual Assessment of Specifications X X

Test Binders from LTPP sections X

X

X

X

X


VALIDATION

Questions ?

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