This study investigates the durability and mechanical properties of 40-year-old black locust (Robinia pseudoacacia) poles harvested from a vineyard in Slovenia. Wood from these poles was compared to recently harvested black locust wood to determine possible reuse options. Visual inspection, hyperspectral imaging, and laboratory tests were conducted to assess decay, density, mechanical properties, extractive content, and water performance. Despite weathering, the old black locust poles exhibit superior mechanical properties compared to recent wood. The density of the old poles was considerably higher, reflecting their high quality. Decay assessment revealed minimal decay, with the wood classified into durability class 1 or 2. Extractive content and inherent durability were comparable between old and recent piles made of black locust. The calculated resistance dose of the old poles was significantly higher, confirming their prolonged service life even after 40 years of exposure. This study demonstrates that 40-year-old black locust poles maintain excellent durability and mechanical properties, making them suitable for reuse in outdoor applications. These findings support sustainable waste management strategies by promoting the reuse of durable wood materials.

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