In this study, an artificial neural network was used in modelling the Marshall stability of asphalt concrete under various temperature and exposure conditions. To study MS, based on the physical properties, exposure time, and ambient temperature, exposure times of 1.5, 3, 4.5, and 6 h and temperatures of 30 °C, 40 °C, and 50 °C were selected. The results showed that at the ambient temperature of 17 ℃, the stability of the asphalt core samples decreased by 40.16% after 1.5 h at 30 ℃ and decreased by 62.39% after 6 h. At 40 °C, a decrease of 74.31% was recorded after 1.5 h and 78.10% after 6 h. At 50 °C, the asphalt stability decreased to 83.22% after 1.5 h and to 88.66% after 6 h. The experimental results and the artificial neural network model showed good correlation, so the artificial neural network method can be used to simulate MS. Modeling the marshalling stability of asphalt concrete at different temperatures and exposure times using artificial neural networks. To study MS, depending on the physical properties, exposure time and ambient temperature, exposure times of 1.5, 3, 4.5 and 6 h and temperatures of 30 oC, 40 oC and 50 oC were selected. 
At an ambient temperature of 17 oC, the stability of the asphalt core samples decreased by 40.16% and 62.39% after 1.5 h and 6 h at 30 oC, respectively. At 40 °C, a drop of 74.31% was recorded after 1.5 h and 78.10% after 6 h. At 50 oC, the bitumen stability decreased to 83.22% after 1.5 h and to 88.66% after 6 h. The experimental results show a good relationship with the artificial neural network model, and the artificial neural network method can be used to model the MS. Fatigue failure is a common problem with asphalt concrete and can lead to road damage. Many studies have been conducted to find ways to increase the fatigue life of asphalt concrete mix. This study investigated the effect of adding waste polyethylene terephthalate (PET) on the stiffness and fatigue properties of SMA mixtures at optimal asphalt materials. Various percentages of scrap PET up to a maximum size of 2.36 mm were added to the SMA mixture. The indirect tensile hardness modulus test and indirect tensile fatigue test were performed at 20 °C and three different stress levels (250, 350, 450 kPa), respectively. 
Engineered steel fibers are becoming an increasingly important type of concrete reinforcement. Some applications of steel fiber reinforced concrete (SFRC) are very common in civil and structural engineering. Several research efforts are underway around the world to advance theoretical and technical knowledge about the properties and behavior of SFRCs. However, research interest in the fiber itself is lacking. The mechanical properties and quality of fibers affect the quality and performance of SFRCs. The increasing number of fiber producers and the associated potential changes in the quality and mechanical properties of steel fibers form the basis of this study. The most popular type of steel fiber in the European market was selected and tested for ductility and other properties. Polyethylene Terephthalate (Pet) PET is the most commonly used thermoplastic polyester. PET is an abbreviation for polyethylene terephthalate, a long-chain polymer belonging to the polyester family. 
Polyethylene terephthalate is a semi-crystalline thermoplastic polyester. PET is a polyester formed by the polymerization of acids and alcohols.. Use Of Polymers in Asphalt Pavement Asphalt has been used as a composite binder in road construction. However, it is well known that asphalt mixtures have temperature weaknesses such as low temperature crack damage, medium temperature fatigue and high temperature cracking. The performance of bitumen can be improved by controlling the refining process or by selecting the appropriate starting crude oil, both of which are difficult to achieve. Therefore, the most preferred way to improve the quality of asphalt is to modify it. The asphalt will harden as the wind blows. Asphalt can be softened with a thinner oil or flux. Another way to improve the quality of asphalt is by adding polymers. The rheological properties of bitumen are often improved by modifying bitumen with polymers. In conditions of heavy traffic and increased road users, the asphalt mixture must have good rutting and thrust resistance. 
Therefore, the consistency of the asphalt mix should be sufficient to deal with the traffic problems. The flow of the pavement depends on the consistency of the asphalt mixture. Fluidity is the ability to regulate the speed of pavement asphalt mixing, and the subgrade settles slowly without cracks. The viscoelastic properties of bitumen depend on the chemical composition, which affects the properties of bitumen. Pavement defects are dependent not only on traffic loads, but also on the ability of the asphalt mix to withstand temperature changes that can lead to cracking and rot in areas with high temperatures at low temperatures. Improvement in road performance is necessary as there are now more and more traffic factors such as increased traffic volume, increased tire pressure and increased load. Improved performance pavements require asphalt with good inter-aggregate cohesion, low temperature cracking and low temperature rutting. 
PET in road asphalt mix Polymer-modified asphalt using virgin polymers to improve asphalt properties has been successful for many years. Recently, recycled polymers such as waste PET have been used to replace commercial virgin materials. Also scrap tires are used, which have a positive effect on the road surface. Whether using hot-mix or cold-mix technology, polymers such as PET have been used in asphalt pavement to improve peeling, thermal cracking, temperature sensitivity, fatigue damage and ratting resistance. Use them when you need better durability and performance. Most of the time, they are chosen to minimize life cycle costs. Polymers used as modified binders have significantly improved cohesion and adhesion properties. The Action Plan (WRAP) mentions that PET is the largest amount of plastic waste that can be recycled from domestic waste streams. It can be used as an additive to asphalt mixtures.
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