Abstract
In this reported work, thermoplastic polyurethane (TPU) was used as a reactive polymer modifying agent to prepare a modified-asphalt, using a high-speed shearing method. Physical performance tests of the TPU-modified asphalt were conducted before and after short-term aging, and the aging resistance was examined by the change in materials properties. In addition, low-temperature rheological properties, thermal properties, the high-temperature storage stability, and the aging mechanism of TPU-modified asphalt were also investigated. The results showed that the addition of TPU improved the aging resistance of base asphalt, which was evidenced by the increased penetration ratio and decreased softening point of the asphalt, after aging. Similarly, Fourier Transform infrared (FTIR) spectroscopy results verified that TPU improved the asphalt aging resistance. It was found that the TPU functional groups played a role in improving thermal properties, high-temperature storage stability, and in the dispersion of modified asphalt.
Highlights
Asphalt is an engineering material used in many industrial sectors of the national economy.Its wide range of uses makes asphalt an irreplaceable product, in road construction and in waterproofing of buildings [1]
The present study focused on the physical performance, as well as low-temperature rheological properties of thermoplastic polyurethane (TPU)-modified asphalt
With the increase of TPU content, the softening point increment decreased after the rolling thin-film oven test (RTFOT) aging, demonstrating the improved aging resistance of the asphalt
Summary
Asphalt is an engineering material used in many industrial sectors of the national economy. While additives help to improve the performance of asphalt, they create some problems, such as the compatibility of the modifier and the base asphalt [10], stability of the modified-asphalt [11], and the balance between high- and low-temperature properties [12]. To solve these problems, many researchers added nanomaterials into base asphalt or polymer-modified asphalt (PMA) to make up for the deficiencies of PMA in performance. The thermal properties, the high-temperature storage stability of TPU-modified asphalt and its aging mechanism were studied
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