Due to a growing interest in basalt fibers as a reinforcing material for concrete, it becomes necessary to study behavior of such fibers and their interaction with the concrete matrix. Basalt fibers have prospective mechanical and processability properties, as well as good cost-effectiveness when used as concrete reinforcement. However, alkali resistance properties of basalt fiber are rather weak. Three types of basalt fibers from various manufacturers are presented, which were produced from different basalt raw materials and with distinct production technologies. All presented basalt fiber types were studied before mixing with concrete and after it has cured. Size and morphology, young's modulus, tensile strength, bending modulus and flexural properties as well as chemical analysis tests were carried out on the types of basalt fibers under consideration. One type of basalt fibers showed better alkali resistance properties due to the special selection of raw materials for the basalt fibers production.
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