Promoting the use of scrap tire rubber and bio-modifiers in outdoor construction such as road pavements requires an in-depth understanding of their resistance to solar radiation which causes premature aging in outdoor constructions. Aging changes bitumen's colloidal stability, increasing the content of asphaltenes, and decreasing the content of aromatics as aging progresses. Bitumen's changes during aging include oxidation, aromatization, chain scission, and carbonization, which alter bitumen's chemical, physical, and mechanical properties. Here, we examine how exposure to ultraviolet radiation changes the physicochemical and mechanical properties of bio-modified rubberized bitumen (BMR) containing various bio-modifiers. To do so, the physicochemical and mechanical properties of rubberized bitumen specimens containing bio-modifiers from castor oil (CO), corn stover oil (CS), miscanthus oil (MS), wood pellets oil (WP), and waste vegetable oil (WVO) were examined before and after they were exposed to ultraviolet radiation for 50, 100, and 200 h. The study results showed that the resistance of the abovementioned bitumens to aging caused by ultraviolet exposure was highly dependent on the source of the bio-modifier. The aging resistance was highest for CO-BMR and WP-BMR, followed by WVO-BMR, CS-BMR, and MS-BMR. This was attributed to the presence of unsaturated groups in CO and WP, which acted as sacrificial agents. In the case of WP, the improvement can also be attributed to the presence of high content of furfural. It should be noted that furfural has been used as a specialty antiaging chemical in industry. The study outcomes help manufacturers select modifiers for rubberized bitumen to enhance its resistance to UV aging and promote sustainability in construction.

在室外建筑（如人行道）中推广使用废轮胎橡胶和生物改性剂需要深入了解其对太阳辐射的抵抗力，这些抵抗力会导致室外建筑过早老化。老化会随着老化的进行而改变沥青的胶体稳定性，增加沥青质的含量，并减少芳烃的含量。沥青在老化过程中的变化包括氧化，芳香化，断链和碳化，这些都会改变沥青的化学，物理和机械性能。在这里，我们研究了暴露于紫外线辐射下如何改变包含各种生物改性剂的生物改性橡胶沥青的物理化学和机械性能。为此，在使用之前，对含蓖麻油（CO），玉米秸秆油（CS），桔梗油（MS），木屑油（WP）和废植物油（WVO）的生物改性剂的橡胶沥青样品的理化和力学性能进行了检查。然后将它们暴露在紫外线辐射下50、100和200小时。研究结果表明，上述沥青对紫外线暴露引起的老化的抵抗力高度依赖于生物改性剂的来源。CO-BMR和WP-BMR的耐老化性最高，其次是WVO-BMR，CS-BMR和MS-BMR。这归因于CO和WP中作为牺牲剂的不饱和基团的存在。就可湿性粉剂而言，这种改善也可归因于高含量糠醛的存在。应当指出，糠醛在工业上已被用作特殊的抗衰老化学品。研究结果可帮助制造商选择橡胶沥青的改性剂，以增强其抗紫外线老化和促进建筑可持续性的能力。