چكيده به لاتين
In recent decades, various modifiers have been used to improve the performance of asphalt mixtures. In the meantime, the fibers are the most widely used in the field due to their favorable physical and chemical properties and easy mixing. The main objective of this research is to evaluate the technical properties of asphalt mixture modified with basalt and glass fibers. In order to provide asphalt samples, these two types of fibers are used in different percentages. In this way, 42 samples (with different percentages of fiber and bitumen) were made using Marshal Hammer. Then, experiments were carried out to determine the optimum bitumen content on these specimens, and the values for Marshall flow were taken. In the next step, while constructing 63 asphalt samples using a giratory device, Then mix asphalt conventional tests include the determination of indirect tensile strength, moisture sensitivity test, resilient modulus and creep tests performed. The results of this research indicate that using these two types of fibers increased the percentage of optimum bitumen and Marshall resistance. At best, adding 0.1% glass fiber resulted 13% increase in Marshall resistance. In general, as well as increasing the fiber content of the asphalt samples, Resilient Modulus increases. The highest increase in the modulus of mixture is observed if 0.3% of the fiber is used, which increases by about 50%. On the other hand, the addition of fibers increases the amount of Flow Number, so that this parameter is about 1500 for the control sample, and if using 0.1% of the basalt fiber with an increase of about 20% to 1800.
Keywords: Asphalt mixtures, fiber Basalt, fiberglass, concrete pavement
