Zhang Shibo, Yan Yong, Yang Yang, Guo Rongxin
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China.
Yunnan Key Laboratory of Disaster Reduction in Civil Engineering, Kunming 650500, China.
Molecules. 2024 Feb 4;29(3):716. doi: 10.3390/molecules29030716.
Recycled crumb rubber (RCR) is considered a reliable asphalt modifier and a solution to the problem of scrap tyre recycling. RCR-modified asphalt (RCRMA) typically has good low-temperature performance and storage stability. However, the pre-treatment of crumb rubber (CR) impairs its physical properties, resulting in poor high-temperature performance, which limits the industrial application of RCRMA. In this study, low-density polyethylene (LDPE) composite RCR was used to modify asphalt, and LDPE/RCR-composite-modified asphalt (L-RCRMA) was produced to compensate for the deficiencies in the high-temperature performance of RCRMA. The comprehensive physical properties of L-RCRMA were elucidated using tests such as the conventional properties, rotational viscosity, and rheological tests. The results showed that the incorporation of LDPE improved the high-temperature stability and rutting resistance of the asphalt, but an excessive amount of LDPE impaired the low-temperature performance and storage stability of L-RCRMA. Therefore, it is necessary to control the amount of LDPE to balance the performance of the asphalt. On this basis, we recommend a dosage of 20% for RCR and 1.5% for LDPE.
再生胶粉（RCR）被认为是一种可靠的沥青改性剂，也是解决废旧轮胎回收问题的一种方案。RCR改性沥青（RCRMA）通常具有良好的低温性能和储存稳定性。然而，胶粉（CR）的预处理会损害其物理性能，导致高温性能不佳，这限制了RCRMA的工业应用。在本研究中，使用低密度聚乙烯（LDPE）复合RCR来改性沥青，并制备了LDPE/RCR复合改性沥青（L-RCRMA），以弥补RCRMA高温性能的不足。通过常规性能、旋转粘度和流变试验等测试，阐明了L-RCRMA的综合物理性能。结果表明，加入LDPE提高了沥青的高温稳定性和抗车辙性能，但过量的LDPE会损害L-RCRMA的低温性能和储存稳定性。因此，有必要控制LDPE的用量以平衡沥青的性能。在此基础上，我们建议RCR的用量为20%，LDPE的用量为1.5%。
