## 2 Literature Review  
During the service period of the asphalt wearing layer, the deterioration of physical and mechanical properties is most influenced by changes in the bituminous binder due to aging processes. Due to the influence of temperature and oxygen, a change in the structure and/or composition of the binder occurs, and it turns harder and more brittle [3]. The oils turn to resins, the resins convert to asphaltenes in the result of oxidation process [4]. Oxygen diffusion and oxidative reaction are two main factors in bitumen oxidative aging discovered by experiment (the dynamic balance between them could not be easily studied by experimental methods due to its comprehensiveness). A pavement oxidation model for a bituminous binder was used to simulate this process. Oxygen molecules penetrate the bitumen film and react with binder molecules [5]. By decreasing oxygen diffusion, bitumen oxidation can be slowed down; however, this only works for oxygen diffusion determined cases. Except for binder determination, a numerical model to predict the diffusion and reaction of oxygen in petroleum bitumen film was developed by [PERSON] [6]. Model parameters for the diffusion-oxidation process were obtained by correlating oxygen uptake of bitumen solutions to changes in carbonyl infrared spectral absorption and viscosity. The aim of the research [7] was to define the effect of oxidative aging on the chemical and rheological properties of neat and styrene-butadiene (SBS) polymer-modified bitumen. Increasing the amount of RAP in mixed asphalt production has been set as target for the industry [8]. This leads to mitigate the impact of tripled binder costs [9]. As the demand for virgin bitumen and virgin mineral aggregates decreases, the use of reclaimed materials is increasing [10]. During rehabilitation RAP is produced milling paved HMA road. HMA recycling is not something unusual as the first site of hot in-place recycling was completed and documented in the 1930s. The invention and development of a big road milling machine and in conjunction with the oil crisis in 1970s lead to increased interest in asphalt recycling [11]. RAP's properties play an initial role in defining the performance of the recycled mixture when a high percentage of RAP is used in HMA production. Gradation and the composition of the old asphalt pavement not only define RAP properties as the milling process also has an influence [12]. The asphalt pavement milling machine's picks wear intensity impacts on the gradation of RAP, the cost of the job performed, and the utilization of the milling machine [13]. In research, it has been demonstrated that asphalt mixtures with RAP content performed at least similarly, or better than, as conventional HMA mixtures [14]. The process of production a recycled HMA or WMA mixtures is more complex than the process of production of an asphalt mixture only out of the virgin materials. The HMA mixture production errors of and designed suboptimal mass ratio of constituents have an immediate effect to poor quality of asphalt pavement [15]. The type of asphalt plant and production parameters have an impact on the properties of the recycled asphalt mixture and the degree of mixing of the old and new bituminous binder [16]. The current HMA quality control (QC) methods are work, power, and time consumptive, which makes efficient processing of information necessary to monitor and control the production [17]. Hot recycling in plants is one of the advanced applications adapted for recycling of asphalt pavement materials. Defined in the recipe quantity of RAP, virgin binder and mineral aggregates are added, heated, and mixed to produce the recycled HMA during hot recycling in plant process. Different types of rejuvenators are added [18]. HMA mixtures are stored in heated ready-mix silos before they are ready to be transported to construction sites. The HMA storage time in the silo varies and depends on several factors. Short-term aging of the binder may occur if HMA is exposed to higher temperatures.