Transportation agencies are primarily responsible for building new roads and maintaining current roads. The main focuses of these agencies are to prioritize maintenance and make significant rehabilitation decisions to handle serious problems facing road authorities. Considerable efforts and an abundance of studies have been performed to determine the nature, mechanisms, test methods, and measurement of pavements for preservation and improvements of roadways. The presented study reports a state-of-the-art review on recent advances in the application of artificial intelligence in various steps of flexible pavement, including pavement construction, performance, cost, and maintenance. Herein, the challenges of gathering large amounts of data, parameter optimization, portability, and low-cost data annotating are discussed. According to the findings, it is suggested that greater attention should be paid to integrating multidisciplinary roadway engineering techniques to address existing challenges and opportunities in the future.

One of the major problems caused by the construction and demolition of buildings is the environmental pollution due to the disposal of the large volume of generated waste materials. In addition to the protection of environment, the recycling and reusing of the waste materials are an economical measure. In this research, the viability of using the recycled brick powder as a partial or full replacement of mineral filler in asphalt concrete has been investigated. The primary natural siliceous aggregate filler, as control filler, has been replaced in different percentages, with the secondary recycled brick powder, and the mixtures have been evaluated in terms of, Marshal Stability, flow, indirect tensile strength, moisture damage and volumetric characteristics. The results show that, the Marshal Stability increases and the flow decreases with increasing the brick powder content in the mixture. The results show that full replacement of the natural filler with brick powder results in the highest resistance against permanent deformation and indirect tensile strength. It is also shown that the mixtures containing brick powder are more resistant against moisture damage than the control mixture. The replacement of the mineral filler with the brick powder does not significantly affect the volumetric properties of the mixture.

Engineers are constantly trying to improve the performance of the flexible pavements. The main surface distress types which cause maintenance and disruption are rutting and fatigue cracking. For solving these problems, many studies have been carried out until now, ranged from changing gradation to adding polymers and fibers to asphalt mixture. In this study, polypropylene additive was selected as fiber additive because of low costing and having good correlation with asphalt pavement. Three type of polypropylene additive in the length 6, 12 and 19 mm were selected and used at five different percentages in the asphalt concrete mixture. Asphalt specimens were analysed by Marshall Analysis and finally tested by Marshall Stability apparatus. Adding polypropylene increased Marshall Stability (38%), and decreased Flow (39%). These results show that polypropylene can be helpful for increasing pavement life.