TY - JOUR
T1 - Effects of ultraviolet exposure on physicochemical and mechanical properties of bio-modified rubberized bitumen
T2 - Sustainability promotion and resource conservation
AU - Zhou, Tao
AU - Kabir, SK Faisal
AU - Cao, Liping
AU - Fini, Elham H.
N1 - Funding Information:
This work was supported by the National R&D Program of China (Grant No. 2018YFB1600100), the U.S. National Science Foundation (Award No. 1935723), and the National Natural Science Foundation of China (Grant No. 51978219). The authors gratefully acknowledge the financial support from the China Scholarship Council. Special thanks go to Daniel Oldham and Amirul Rajib with Arizona State University for their generous assistance with the laboratory experiments.
Publisher Copyright:
© 2021
PY - 2021/8
Y1 - 2021/8
N2 - 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.
AB - 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.
KW - Bio-modifier
KW - Oxidation
KW - Rheometry
KW - Rubberized bitumen
KW - Spectroscopy
KW - Sustainability
KW - Ultraviolet aging
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U2 - 10.1016/j.resconrec.2021.105626
DO - 10.1016/j.resconrec.2021.105626
M3 - Article
AN - SCOPUS:85105898011
SN - 0921-3449
VL - 171
JO - Resources, Conservation and Recycling
JF - Resources, Conservation and Recycling
M1 - 105626
ER -