TY - JOUR
T1 - Investigation on storage stability and rheological properties of environment-friendly devulcanized rubber modified asphalt
AU - Zhou, Yixin
AU - Xu, Gang
AU - Leng, Zhen
AU - Kong, Peipei
AU - Wang, Houzhi
AU - Yang, Jun
AU - Qiu, Wenli
AU - Xu, Zhongyin
AU - Chen, Xianhua
N1 - Funding Information:
The authors acknowledge the financial support of the National Natural Science Foundation of China (No. 51778140 , No. 52078130 ) and Major Technology Demonstration of Epoxy Asphalt in Pavement as a Green Highly-Efficient Carbon Mitigation Technology ( BE2022615 ).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/2
Y1 - 2023/2
N2 - The application of conventional rubber modified asphalt was limited to its high viscosity, poor storage stability, and environmental pollution. This study proposed a preparation process of environment-friendly devulcanized rubber modified asphalt (DRMA) with superior performance. The storage stability and rheological properties of base asphalt, rubber modified asphalt (RMA), and DRMA with different modifier content were evaluated by segregation test, frequency scanning test, multiple stress creep recovery test (MSCR), linear amplitude scanning (LAS) test, and bending beam rheometer (BBR) test. Modification mechanisms of DRMA were detected by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and four-component analysis. Test results indicated that interaction between crumb rubber and asphalt was mainly physical and has slight chemical reaction. The swelling process of devulcanized rubber (DVR) was adequate and absorbs more light components, which was crucial to improve rheological properties. The storage stability of DRMA was less susceptible to the content of DVR. Besides the crack resistance of DRMA with 18% DVR dosage, the storage stability, high-temperature performance, fatigue resistance, and low-temperature performance of DRMA were markedly superior to that of RMA if the modifier dosage is the same. The rutting and fatigue resistance of RMA was reinforced and then weakened slightly with the increase of CR content, while that of DRMA was enhanced continuously, implying that more waste crumb rubber can be added to asphalt after devulcanization. DRMA was expected to be widely applied owing to its superior performance and environmental features.
AB - The application of conventional rubber modified asphalt was limited to its high viscosity, poor storage stability, and environmental pollution. This study proposed a preparation process of environment-friendly devulcanized rubber modified asphalt (DRMA) with superior performance. The storage stability and rheological properties of base asphalt, rubber modified asphalt (RMA), and DRMA with different modifier content were evaluated by segregation test, frequency scanning test, multiple stress creep recovery test (MSCR), linear amplitude scanning (LAS) test, and bending beam rheometer (BBR) test. Modification mechanisms of DRMA were detected by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and four-component analysis. Test results indicated that interaction between crumb rubber and asphalt was mainly physical and has slight chemical reaction. The swelling process of devulcanized rubber (DVR) was adequate and absorbs more light components, which was crucial to improve rheological properties. The storage stability of DRMA was less susceptible to the content of DVR. Besides the crack resistance of DRMA with 18% DVR dosage, the storage stability, high-temperature performance, fatigue resistance, and low-temperature performance of DRMA were markedly superior to that of RMA if the modifier dosage is the same. The rutting and fatigue resistance of RMA was reinforced and then weakened slightly with the increase of CR content, while that of DRMA was enhanced continuously, implying that more waste crumb rubber can be added to asphalt after devulcanization. DRMA was expected to be widely applied owing to its superior performance and environmental features.
KW - Devulcanized rubber modified asphalt
KW - Modification mechanism
KW - Rheological properties
KW - Swelling process
UR - http://www.scopus.com/inward/record.url?scp=85145021735&partnerID=8YFLogxK
U2 - 10.1016/j.pce.2022.103332
DO - 10.1016/j.pce.2022.103332
M3 - Journal article
AN - SCOPUS:85145021735
SN - 1474-7065
VL - 129
JO - Physics and Chemistry of the Earth
JF - Physics and Chemistry of the Earth
M1 - 103332
ER -