This study aims to highlight the effect of geogrid materials on the properties of concrete through monitoring the fatigue behaviour of two groups of notched concrete beam specimens cast with two types of workability of concrete. The specimens had the dimensions of 150 mm × 150 mm × 550 mm. The specimens of the first group included testing two specimens, which were cast with a low degree of workability of concrete. The specimens of the second group consisted of testing seven specimens, which were cast with a high degree of workability of concrete. The specimens of the two groups were either reinforced with one layer or two layers of geogrid. The triaxial geogrid having equilateral triangular openings was used as a reinforcement material. The specimens of the two groups were tested under repeated loads with various stress levels at a frequency of 7 Hz up to failure. The test results indicate that the number of cycles of the concrete specimens reinforced with geogrid materials extremely increases for the concrete specimens cast with the low degree of workability. The resistance of concrete specimens reinforced with geogrid materials against the repeated loads significantly improves when the bleeding and slump of concrete are reduced.