Galvanized Coating Performance in Fire Events: Field Case Studies and the Role of Remote Sensing (C2026-00381)

Anil Chikkam, mehrooz zamanzadeh, Michael Carone, Aaron Ulmer, Jose Villalba, Matt Gardner, Kevin Niles

Fire exposure poses a significant threat to above-ground infrastructure such as galvanized steel utility poles and telecommunication tower anchors. Post-fire decisions are often based on limited visual inspections, leading to premature replacement of otherwise serviceable structures and resulting in unnecessary costs. This paper presents two case studies highlighting the value of scientific, multi-parameter assessments in evaluating fire-exposed infrastructure.
The first case involves a galvanized steel utility pole affected by a localized vehicle fire, while the second focuses on guy wire anchors of a telecommunication tower impacted by wildfire. Although initial visual signs—such as discoloration and soot—raised concerns, detailed assessments including electrochemical potential measurements, galvanized coating thickness testing, ultrasonic wall thickness measurements, hardness testing, SEM/EDS analysis, Field Metallography and Replication (FMR), and soil corrosivity evaluation confirmed the structural integrity of both systems.
Both structures were safely retained in service with targeted remediation, avoiding potentially millions of dollars in replacement costs. The paper also discusses EnviroZense, a remote sensor capable of monitoring temperatures up to 2,000°F and detecting conditions that may trigger phase transformation in steel. These case studies underscore the importance of data-driven evaluations over visual judgment in post-fire infrastructure assessment.