## 1 Introduction
In recent years, warm mix asphalt has been gaining popularity due to its benefits, including reduced fossil fuel consumption, reduced greenhouse gas emissions, lower manufacturing, and laying temperatures [20]. Many studies and field cases have demonstrated the eco-friendliness, superior performance, and economic benefits of WMA technologies, such as improved compaction and mixing temperatures, longer hauling distances, and paving workability [18; 21], which contributed to the rapid increase of its market share. In the United States, WMA asphalt made up about 38.9% of the total paving, the equivalent of 147.4 million tons in 2017 [22]. There was a 26% increase in WMA output between 2016 and 2017. The production in Europe, Japan, Canada, and South Africa is still insufficient. The data from the European Asphal Pavement Association showed that, between 2013 and 2017, several European countries allowed the use of WMA, which leads to increasing use of WMA technology year after year [18]. In recent studies, three distinct WMA techniques have been devised: (a) utilization of foaming additives, (b) incorporation of chemical additives (surfactants), and (c) inclusion of non-foaming additives. Recent examinations conducted in both laboratory settings and in the field have demonstrated that pavements constructed using WMA exhibit equivalent or improved performance compared to those constructed using hot mix asphalt (HMA) [23]. Researchers have observed that the introduction of additives for WMA into asphalt blends leads to a notable reduction in the temperatures required for mixing and compaction, with temperature decreases ranging between 20 \({}^{\circ}\)C and 40 \({}^{\circ}\)C [19; 24]. WMA technologies that employ fluidifying additives to lower the viscosity of bitumen during mixture production temperatures, while upholding bitumen functionality, offer a potential resolution to challenges linked with crumb rubber-modified (CRM) binders. Incorporating WMA additives into CR asphalt binders has shown the potential to decrease mixing and compaction temperatures by 15 to 30 \({}^{\circ}\)C [25; 26]. Numerous WMA additives have demonstrated the capacity to lower the production temperature of rubberized binder mixtures by reducing viscosity and enhancing the workability of the rubberized binder [27; 28]. A sustainable paving approach has been developed by researchers, involving the use of WMA asphalt to modify rubberized asphalt binders, thereby contributing to environmental preservation and performance enhancement [29]. The integration of Sasobit into the rubberized binder leads to a decrease in the high-temperature viscosity and low-temperature ductility of rubber asphalt, while also resulting in an increase in the softening point. This combination of effects is beneficial for enhancing workability and promoting high-temperature stability [30]. In a prior investigation conducted by [PERSON] et al. [31], a comparative analysis was carried out involving three distinct WMA additives: Sasobit, Rediset, and Alube. These additives were introduced into the rubberized asphalt binder to assess their influence on high and intermediate temperature performance. The study revealed that the rubberized asphalt binder incorporating Sasobit exhibited superior high-temperature performance in comparison to the rubberized asphalt binder with Alube. Conversely, concerning intermediate-temperature performance, the rubberized asphalt binder with Rediset displayed the most favorable outcomes. The available literature reveals a dearth of investigations concerning the collective impact of various CR asphalt binders modified with optimal quantities of WMA additives. Addressing this gap, the present study aims to investigate the physical attributes of diverse CR binders, each modified with Sasobit, Rediset, and Cecabase. The aim of this investigation is to identify a suitable WMA additive that enhances the workability of the rubberized binder while maintaining a stiffness value higher than that of the original asphalt binder.