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

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

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

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

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

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

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

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

Estimating Condition-Based Highway Reconstruction Needs Questions?