Cracking is considered to be one of the most important distress of the Warm Mix Asphalt (WMA) mixture, which can occur in different climatic conditions due to a lack of proper bonds between aggregate and bitumen. Since the WMA mixture consists of coarse aggregates in different parts of the asphalt layer, cracks can develop and grow at an angular position. Therefore, this study investigates the fracture behavior of WMA mixtures under vertical (Pure mode II) and angular (Pure mode I) cracking states using a semi-circular bend (SCB) sample at −18 °C and +25 °C using the fracture mechanics method. To improve the WMA mixture's performance, additives of Calcium Lignosulfonate (CL) and waste Polyester (PE) fibers, which were economically justifiable, were used separately and simultaneously in different percentages. According to numerical-experimental results, the proposed samples in both pure mode I (angular crack) and pure mode II (vertical crack) were able to model the WMA's fracture behavior and therefore can be used as suitable specimens for studying the pure mode crack deformation of WMA at intermediate and low temperatures. The results also showed that the coarse aggregate distribution in the ligament section of the specimen had a significant contribution in improving the WMA mixture's fracture performance. As a result, fracture energy (G_F), fracture toughness (K_I and K_II), The Flexibility Index (FI), Cracking Resistance Index (CRI), and the Toughness Index (TI) depended on the type of additive used in the WMA mixture. Finally, 0.25PE-6CL, 0.25PE, and 6CL mixtures had the best results in terms of fracture mechanics.

开裂被认为是温拌沥青混合料（WMA）混合物中最重要的问题之一，由于骨料和沥青之间缺乏适当的结合力，因此在不同的气候条件下都可能发生开裂。由于WMA混合物由沥青层不同部分中的粗骨料组成，因此裂纹可能会在某个角度位置发展并增长。因此，本研究使用半圆形弯曲（SCB）样品在−18°C和+25°C的条件下，研究了WMA混合物在垂直（纯模式II）和角（纯模式I）开裂状态下的断裂行为。力学方法。为了提高WMA混合物的性能，经济合理地使用了木质素磺酸钙（CL）和废聚酯（PE）纤维添加剂，并分别以不同的百分比使用。根据数值实验结果，建议的纯模式I（角度裂纹）和纯模式II（垂直裂纹）中的样本都能够对WMA的断裂行为进行建模，因此可以用作研究纯模式裂纹变形的合适样本。中温和低温下的WMA。结果还表明，试样韧带部分的粗骨料分布对改善WMA混合物的断裂性能有重要贡献。结果，断裂能（G 结果还表明，试样韧带部分的粗骨料分布对改善WMA混合物的断裂性能有重要贡献。结果，断裂能（G 结果还表明，试样韧带部分的粗骨料分布对改善WMA混合物的断裂性能有重要贡献。结果，断裂能（G_F），断裂韧性（K _I和K _II），柔韧性指数（FI），抗裂指数（CRI）和韧性指数（TI）取决于WMA混合物中所用添加剂的类型。最后，就断裂力学而言，0.25PE-6CL，0.25PE和6CL混合物具有最佳结果。