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The foundry industry is a major producer of industrial waste, with used foundry sands (UFS) representing the largest share. While bentonite-bonded sands can be reused multiple times, sands with organic binders are typically single-use and are often landfilled due to limited regeneration capacity. Their valorization in construction materials represents an important pathway toward circular economy. This study evaluates the use of UFS from three different foundries, including bentonite- and furan-bonded systems, as p...