Synergetic Effect of Nano‐ZnO and Trinidad Lake Asphalt for Antiaging Properties of SBS‐Modified Asphalt

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Abstract
In order to address the influence of aging on the performance degradation of SBS‐modified asphalt, a composite modification of SBS‐modified asphalt by nano‐zinc oxide (nano‐ZnO) and Trinidad Lake asphalt (TLA) was proposed. Several tests were conducted after adding nano‐ZnO and TLA to SBS‐modified asphalt, including a rotary film oven test (RTFOT), ultraviolet aging (UV), and the pressure aging vessel test (PAV). The conventional physical index, rheological index, and four‐component content of SBS‐modified asphalt before and after three aging modes were tested, and the characteristic functional groups in SBS‐modified asphalt were tracked and analyzed by Fourier transform infrared spectroscopy (FTIR). The results show that the effects of aging on the rheological properties of SBS‐modified asphalt are clearly reduced by adding different proportions of nano‐ZnO and TLA in the process of thermal oxygen aging and the ultraviolet aging test, and the antiaging ability of SBS‐modified asphalt is clearly improved. To improve the conventional performance and rheological properties of SBS‐modified asphalt, an incorporation ratio of 3% nano‐ZnO + 25% TLA was proposed. At the same time, the increased rate of heavy components and the change index of the colloidal instability index in the SBS‐modified asphalt under the blending ratio were significantly lower than the blank SBS‐modified asphalt samples in the same aging mode. FTIR spectra also showed that SBS‐modified asphalt performance deterioration were mainly caused by long‐term aging and ultraviolet aging. The addition of nano‐ZnO and TLA effectively reduced the increase of carbonyl groups and the breakage of the C=C double bond in butadiene and synergistically improved the comprehensive aging resistance of SBS‐modified asphalt. Therefore, the use of this modification is an effective method to solve the aging problem of SBS‐modified asphalt.
Funding Information
  • National Natural Science Foundation of China (51978083)
  • China Scholarship Council (201808430101)

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