1. Estimating Condition-Based Highway Reconstruction Needs
NCHRP 20-24(52) Task 14
(funded by NCHRP 20-7)

2. Estimating Condition-Based Reconstruction NCHRP 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

3. Estimating Condition-Based Reconstruction Working 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

4. Estimating Condition-Based Reconstruction Definitions
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

5. Estimating Condition-Based Reconstruction Interviewees
FHWA
AASHTO
State DOTs
Arizona
Caltrans
Delaware
Illinois
Louisiana
Maryland
Michigan
Nebraska
New York
Ohio
South Carolina
Tennessee
Vermont
Toll Authority
Pennsylvania Turnpike

6. Estimating Condition-Based Reconstruction Key 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

7. Estimating Condition-Based Reconstruction Recommendations
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

8. Estimating Condition-Based Reconstruction Actions
Complete report
Provide information in larger Interstate report
Decisions by FHWA & AASHTO on how to proceed
Implementing actions through FHWA and NCHRP

9. Estimating Condition-Based Highway Reconstruction Needs
Questions?