Journal
JOURNAL OF CLEANER PRODUCTION
Volume 385, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.135712
Keywords
Stress-controlled mode LAOS test; Nonlinear viscoelastic property; SBS; CR CMB; Fourier transform rheology; Lissajous curve; Stress; strain decomposition
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The crumb rubber (CR) recycled from waste tires can effectively improve the mechanical properties of bitumen. By analyzing the results of stress-controlled large amplitude oscillatory shear (LAOS) tests, it is concluded that the incorporation of CR has a positive influence on the nonlinear properties of bitumen, which effectively improves the stress bearing capacity. However, simply increasing the CR content does not always improve the performance of bitumen.
The crumb rubber (CR) recycled from waste tires can improve the mechanical properties of bitumen effectively. For the widely used modified bitumen today, it could work in nonlinear regime in many occasions. This study focuses on the nonlinear properties of styrene-butadiene-styrene (SBS) and CR composite modified bitumen (CMB) by analyzing the results of stress-controlled large amplitude oscillatory shear (LAOS) tests. The results show that the nonlinearity of SBS/CR CMB was significant under low load frequency, high temperature and high stress level. Lissajous curves at these conditions are distorted obviously due to the presence of higher-order harmonics. By analyzing the geometry parameters of Lissajous curves, it can be concluded that the incorpora-tion of CR has a positive influence on the nonlinear properties of bitumen, which effectively improve the stress bearing capacity of bitumen. However, the high-order harmonic analysis indicates that improving the CR content simply does not always improve the performance of bitumen. Besides, the nonlinearity of SBS/CR CMB with lower CR content is similar to that of SBS modified bitumen through the value of I3/I1 and intrinsic nonlinear parameter Q, thus there are two critical CR contents for the prospect of modifying the nonlinearity of bitumen.
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