## 1 Introduction
[29], in their study investigating the effects of Cecabase RT 945 additive on WMA mixtures, observed the penetration and softening point values by adding 0.2 to 0.5% by weight of the additive to 50/70 penetration class bitumen. The penetration value increased to a 0.3% additiverate and remained unchanged, while the softening point value decreased as the additive rate increased. As a result, they stated that the additive provided a 35 \({}^{\circ}\)C decrease in the production temperature. [PERSON] et al. [30] reported in their study that increasing Cecabase RT 945 had a moderate effect on the indirect tensile strength of asphalt mixtures. The study of [PERSON] et al. [31], in which they added 0.3% by weight of Cecabase RT 945 additive to virgin bitumen with a penetration of 35/50, revealed that the penetration grade did not change and the softening point value decreased slightly. [PERSON] et al. [32] added Cecabase RT 945 at 0.2%, 0.3%, 0.4%, and 0.5% by weight to virgin bitumen and compacted at 100 \({}^{\circ}\)C. They stated that WMA samples performed well or better than HMA control samples. In their study, [PERSON] et al. [33] investigated the rutting resistance of WMA pavements modified with various additives using samples obtained from a long-term pavement performance (LTPP) study in New Mexico. As a result, the mixture combined with Cecabase RT 945 additive and polymer modification showed a significant increase in rutting resistance. In contrast, [PERSON] et al. [34], who also examined LTPP test sections in New Mexico, concluded that the sections of Cecabase RT 945 and other WMA additives exhibited slightly higher rutting compared to HMA. There are only a limited number of studies in the literature on Cecabase RT BIO10 as a WMA additive. [PERSON] et al. [13] obtained WMA mixtures by adding from 0.1% to 0.6% by weight of Cecabase RT BIO10 to virgin bitumen with 70/100 penetration at 120 \({}^{\circ}\)C. They stated that Marshall stability and flow values of WMA mixtures decreased compared to those of HMA mixtures. [PERSON] et al. [35] investigated WMA mixtures using 11 different additives designed for airport coatings. When 0.4% Cecabase RT BIO10 additive was added to virgin bitumen with a performance class (PG) of 67.8-23.9, the performance class changed to 67-17.6. According to the Hamburg rutting test results, a significant decrease in the performance of WMA mixtures was observed. [PERSON] et al. [36] and [PERSON] et al. [37] investigated the effects on penetration value and softening point by adding 0.5% by weight of Cecabase RT BIO10 to 50/70 and 35/50 penetration bitumen. They concluded that the additive increased the penetration of the bitumen and reduced the softening point value. [PERSON] et al. [38] investigated the effect of a Cecabase RT BIO10 additive of 0.35% by weight on the physical properties of bitumen and fracture toughness, using a mixing temperature of 135 \({}^{\circ}\)C for a duration of 5 min. As a result, they concluded that the additive increased the penetration value, decreased the softening point, and reduced the fracture toughness. A summary of the findings from previous studies is provided in Table 1.  
Previous studies on Cecabase RT BIO10 in WMA have focused on varying additive rates while keeping parameters such as mixing temperature, speed, and time constant. This study aimed to examine the physical and chemical properties of WMA mixtures by modifying asphalt binders with Cecabase RT BIO10 supplied by ARKEMA Group, one of the chemical additives used in WMA production. The effects of changing mixing temperatures, mixing speeds, mixing times, and Cecabase RT BIO10 additive rates on bitumen performance were investigated using the Taguchi method. Cecabase RT BIO10 was added to 50/70 penetration virgin bitumen at four different levels as 0%, 0.3%, 0.4%, and 0.5% by weight. Experimental plans were created using the Taguchi L16 orthogonal array.