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https://www.nationalacademies.org/trb/events

Early Warning for Oregon's Aging Post Tensioned Bridges: Proactive Detection, Longer Life, Lower Risk

This research tackles the urgent need to safely manage Oregon's aging post-tensioned (PT) concrete bridges, which rely on high-strength steel tendons but are prone to hidden corrosion from grout voids, water ingress, and outdated grouting methods. Rising risks of tendon failure, cracking, prestress loss, or collapse drive the development of a risk-based, scalable protocol. It includes a vulnerability screening score, a centralized PT bridge database with corrosion-relevant attributes, structural modeling linking observable changes (camber, strains, natural frequencies) to internal damage, proven nondestructive evaluation (NDE) methods (ultrasound, ground penetrating radar (GPR)), and practical inspection/monitoring guidelines demonstrated on a case study bridge. Integration into the Oregon Department of Transportation (ODOT) Bridge Inspection Program Manual supports proactive network-level screening, prioritized inspections, service life extension, and risk reduction—enhancing safety and reliability of Oregon transportation infrastructure. OBJECTIVES The project equips ODOT with practical, risk-based tools to proactively manage PT bridge safety and serviceability. Main objectives are to: (1) create a vulnerability screening score that prioritizes bridges by corrosion risk factors (grout quality, duct material, exposure conditions); (2) build a centralized statewide PT bridge database for efficient network assessment; (3) develop a scalable protocol integrating visual inspections, NDE techniques (ultrasound, GPR), and damage-tolerance analysis to detect defects, predict remaining service life, and direct interventions; and (4) field-test the approach on a case study bridge and embed the resulting guidance in the ODOT Bridge Inspection Program Manual. These steps will extend bridge life, reduce hidden corrosion risks, optimize inspection efforts, lower unexpected failure potential, and enable cost-effective statewide maintenance. This research equips ODOT with risk-based tools for safer, more efficient PT bridge management. Key benefits include early detection of tendon corrosion, extended service life through targeted inspections, improved efficiency via network screening and prioritization, major cost savings by avoiding emergencies and premature replacements, consistent statewide protocols in ODOT manuals, and reduced risks to workers and the public. Overall, it supports safer, more resilient, and cost-effective stewardship of Oregon’s transportation infrastructure.