mechanical properties due to uneven fiber distribution and lower mix workability. Using polypropylene fibers reduces the need for steel reinforcement, lowering the carbon footprint. This fiber-enhanced concrete is suitable for infrastructure applications, such as port quays, where durability and reduced maintenance are critical. Additionally, it offers cost benefits in projects without high dynamic load requirements.

chemical agents. The constant increase in expectation of increasing the quality of concrete has led to the modification of concrete with polymers. The presented research observed the influence of the structure and length of polymer fibers on the properties of concrete. The following types of concretes were used in the study: Portland cement CEM I 42.5R, sand, gravel aggregate of fractions 2-8 mm and 8-16 mm, water, Master Pozzolith STD plasticizer and polypropylene fibers of different length and structure. For each series of concretes, the following were determined: compressive strength after 7, 28 and 56 days of maturation, as well as water absorption, bulk density and frost resistance. In the next stage of the research, the surface layer of the synthesized composites was analyzed, determining mainly their morphology and elemental composition.