Estimating Condition-Based Highway Reconstruction

Needs

NCHRP 20-24(52) Task 14(funded by NCHRP 20-7)

Estimating Condition-Based ReconstructionNCHRP 20-24(52) Task 14

Questions about models for C & P (HERS & NBIAS) estimating reconstruction for other than traffic or safety

20-7 Quick Turnaround funded Task 14 (4 months)

Survey FHWA, AASHTO & State DOTs

Determine if there is a valid issue

If so, define possible approaches to address

Estimating Condition-Based ReconstructionWorking Group

FHWA Ross Chrichton, Ian Friedland, Steve Gaj, Darren

Timothy, Steve Sissel AASHTO

Tony Kane, Ken Kobetsky State DOTs

Caltrans – Michael Johnson Maryland – Neil Pedersen New York – Nancy Ross

Consultants PB - Hal Kassoff, Task Leader Cambridge – Arlee Reno, Bill Robert, Herb Weinblatt Alan Pisarski

Estimating Condition-Based ReconstructionDefinitions

Condition-based: physical deterioration (not traffic or safety)

Reconstruction: Replacement in kind focused on major

elements Roadway: includes full paving section, unsuitable

sub grade, failed drainage, etc. Bridge: includes replacement of > 50% of

superstructure or substructure

Estimating Condition-Based ReconstructionInterviewees

FHWA AASHTO State DOTs

Arizona Caltrans Delaware Illinois Louisiana Maryland Michigan Nebraska New York Ohio South Carolina Tennessee Vermont

Toll Authority Pennsylvania Turnpike

Estimating Condition-Based ReconstructionKey Findings

Condition-based Interstate reconstruction needs are not insignificant – most or all of original Interstate not reconstructed for traffic or safety will require condition-based reconstruction in foreseeable future

More prevalent in cold climates More prevalent in pavements than bridges –

examples abound in both Due to variety of causes – materials, design details,

soils, freeze-thaw, excessive traffic, higher axle loadings

Late 1980’s/early 1990’s turning point in durability of constructed pavements and bridges

Would add up to multiple-billions

Estimating Condition-Based ReconstructionRecommendations

Follow-on effort is justified Two options presented to Working Group

Enhanced Models & Methods Empirical Adjustment

Enhanced Models & Methods: Multi-year, Multi- millions, Integrated with Models & Methods

Empirical Adjustment: One shot adjustment for Interstates and similar facilities done situationally

Hybrid proposed by working group – Empirical approach but adapted to models and methods

Estimating Condition-Based ReconstructionActions

Complete report Provide information in larger Interstate report Decisions by FHWA & AASHTO on how to

proceed Implementing actions through FHWA and

NCHRP

Estimating Condition-Based Highway Reconstruction

Needs

Questions?