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Concrete is one of the main materials in construction due to its unique properties, but it suffers from weaknesses due to its low tensile strength and brittleness. One of the methods for improving these weaknesses is the use of fibers in concrete. Rock wool is one of the fibers that can be effective in enhancing the mechanical performance of concrete. The aim of this research is to analyze the effect of rock wool fibers with a diameter of 0.004 mm and lengths of 6 and 12 mm on the resistance of concrete to cold and frost. In this research, four mixtures with different amounts of rock wool fibers (0, 0.2, 0.4, 0.6 percent) were investigated. The results showed that concrete containing 0.4 percent rock wool fibers showed good resistance to cold and its resistance increased compared to ordinary concrete. At the same time, adding more rock wool fibers reduced the resistance of concrete to cold. Due to the high water absorption of rock wool fibers, the water-to-cement ratio increased, which reduced the mechanical strength of concrete. For this reason, a lubricant was used to reduce the water-cement ratio to increase the resistance of concrete to cold.
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