Research Information System
TEKNIK DERGI, vol.29, no.4, pp.8515-8535, 2018 (SCI-Expanded)
The usability of low-cost iron wire fiber for reinforcement of hot asphalt mixtures was investigated with experiments in this study. Five mixtures having different fiber content of 1%, 3%, 5%, 7%, 9% and control mixtures were prepared. Characteristic properties of bitumen, aggregate and iron wire used in the mixtures were determined by thermogravimetric analysis (TGA), conventional bitumen tests, conventional aggregate tests, and metal tensile tests. After optimum bitumen rate was determined Marshall Stability Test, Cantabro Tests were performed in order to measure the performance of the mixtures. Additionally, moisture susceptibility of samples was determined with indirect tensile strength test. As a result of indirect tensile strength tests, indirect tensile strength (St) and indirect tensile strength ratio (ITSR) values were calculated. The results of the investigations indicate that the addition of low-cost iron fiber in the amount of 1%-3% improved performance of asphalt mixtures. When the used fiber rate was increased over 3%, clustering created by fibers was observed through stereo-microscope observations. Consequently, air voids were increased and bitumen-aggregate interaction decreased. Increasing fiber ratio especially, at 7-9 percent caused compressing, durability and stability problems in the mixture.