ADVANCED MATERIALS & PROCESSES | OCTOBER 2025 16 A common issue during post-fire inspections of galvanized steel structures is the misinterpretation of surface discoloration—particularly dark or blackened areas—as active corrosion, similar to that seen on bare carbon steel. This often results from a limited understanding of zinc coating behavior under high temperatures. Discoloration in fire-exposed galvanized structures can arise from phenomena such as localized melting, zinc oxidation, or intermetallic phase changes. While visually significant, these changes do not necessarily indicate a loss of corrosion protection or structural integrity. The image on the opening page of this article shows a wildfire as an immediate threat to a power transmission structure. In the telecommunications and electrical transmission and distribution (T&D) sectors, reliance on visual inspection alone can lead to inaccurate assessments and premature replacement of assets. A more rigorous evaluation— incorporating electrochemical testing, coating thickness measurements, and metallurgical analysis—is essential for accurate condition assessment and sustainable asset management. BACKGROUND This paper presents a case study of a post-fire assessment on a guyed telecommunications tower with anchor shafts exposed to wildfire. Matergenics Inc. conducted a detailed inspection to evaluate thermal damage, assess structural integrity, and determine the condition of the galvanized protective coatings. The findings highlight the importance of science- based evaluation protocols to support informed repair decisions and ensure the continued safety and reliability of critical infrastructure. CASE STUDY: TELECOMMUNICATIONS TOWER EXPOSED TO WILDFIRE The telecommunications tower used to support antennas for wireless communication is stabilized using anchor shafts and guy wires. The tower is connected to the anchor shafts through tensioned guy wires, which extend from the tower to the shafts at specific angles. This configuration helps maintain vertical alignment, resists environmental forces, and ensures structural integrity for reliable signal transmission. The tower featured in this case study was affected by a wildfire in September 2024. The site included the main tower and three sets of Fig. 1 — Telecommunications tower featured in this case study. Fig. 2 — Photograph showing guy wires of anchor BB with visible discoloration. Fig. 3 — Photograph showing guy wires of anchor CC. Fig. 4 — Closer view of one of the anchor BB guy wires clearly shows discoloration. Dark looking deposits are byproducts of combustion. Fig. 5 — Closer view of one of the anchor CC guy wires clearly shows no exposure to wildfire.
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