Abstract
ABSTRACT In this study, a diisobutyl cyclohexane dicarboxylate (DIBCH) plasticizer was used to modify bitumen for preventing cracking and improving the performance of bitumen pavements. The low-temperature rheological properties of the DIBCH plasticizer–incorporated bitumen were studied via bending beam rheometer (BBR) and dynamic shear rheometer (DSR) tests. Fourier transform infrared spectroscopy (FTIR) and saturate, aromatic, resin, and asphaltene (SARA) fraction tests were performed to investigate the mechanism of the modification of bitumen by the DIBCH plasticizer. The results indicated that the incorporation of DIBCH could enhance the low-temperature deformation ability and stress-relaxation ability of bitumen, and the higher the DIBCH content, the greater the improvement in the low-temperature performance of the bitumen. Furthermore, a microscopic analysis revealed that the modification mechanism of bitumen by the DIBCH plasticizer was that of physical blending, and they did not react chemically. Moreover, the incorporation of DIBCH increased the proportion of light components in the bitumen, thereby improving its low-temperature properties.
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