in asphalt mixtures for roads with high slopes or areas with high temperatures

Abstract

The spread of road pavement defects is one of the most important problems leading to the deterioration of road pavement performance. The types of

these defects differ according to the nature of their association with traffic loads. Fatigue cracks and rutting are among the most common and widespread types of defects related to traffic loads. These defects have been observed in abundance on the road network in the Syrian Arab Republic. In this research, we thought about using asphalt materials with a 40/50 grade as an alternative to asphalt materials with a grade of 60-70, modified with polymers, which are usually used in areas with high temperatures, high inclinations, and high axial loads, this is because the polymer material is not produced locally and we need to import it in foreign currencies, Also because of the difficulty of adding polymer to asphalt in local plants, due to these reasons, and with the aim of producing an asphalt aggregate mixture that is approximately equivalent in terms of its design life to the polymer-modified asphalt aggregate mixture, this led to thinking about using another type of asphalt materials. The unit for producing asphalt materials was operated in the Baniyas refinery in order to adjust the penetration and produce an asphalt binder within the standard specifications that are compatible with the environment and climatic factors present in Syria, and the high axial loads, and high axial loads, these are asphalt materials with a penetration grade of 40-50, in order to use this type of asphalt material on roads with high slopes, this is to achieve higher stability, and the phenomenon of rutting does not appear in the future as a result of high axial loads and repeated braking at high inclines, especially at high temperatures. In this research, a set of tests were applied to each of the asphalt binders, and asphalt mixture to measure the extent of improvement that has occurred are kinematic viscounty test, Marshall test, indirect tensile test, and modulus of resilient, good results have been shown through the use of asphalt materials with a penetration grade of 40/50, through better performance against rutting (through the hardness index), as these mixtures have higher stability and less fluidity than mixtures of asphalt materials with a penetration grade of 60-70, The indirect tensile strength test also showed higher values ​​at 25°C, As well as testing the , modulus of resilient, which showed higher values ​​at all the temperatures studied, 5, 25, and 40 °C, by using asphalt materials with a penetration grade of 40/50 instead of using asphalt materials with a penetration grade of 70/60.