Using steel fibers to accelerate the heat conduction in asphalt mixture and its performance evaluation. (3rd May 2021)

• Record Type: Journal Article
• Authors: Du, Yinfei; Wang, Jiacheng; Deng, Haibin; Liu, Yingchen; Tian, Jun; Wu, Xiaowei
• Is Part Of: Construction & building materials. Volume 282(2021)
• Publication Date: 2021-05-03
• Subjects: Asphalt mixture -- Steel fiber -- Air voids content -- Thermal conductivity -- Road performance; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.122637
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Steel fiber was used to prepare high-thermal-conductivity asphalt mixture. Steel fiber could increase the thermal conductivity of asphalt mixture by 15.2%. The deformation resistance of asphalt mixture reduced with the addition of steel fiber. Steel fiber could improve the low-temperature and fatigue performance of asphalt mixture. It is recommended to use 1.0% curved hook steel fiber to reinforce asphalt mixture. Abstract: In order to accelerate the heat flow in asphalt pavement, two types of steel fiber, curved hook steel fiber and long sawtooth steel fiber, were used to prepare steel fiber asphalt mixture (SFAM). The results show that all the SFAM specimens presented higher air voids contents at the two ends, compared with control asphalt mixture. From the results of dynamic modulus and creep test it is found that the deformation resistance of SFAMs gradually reduced with the increase of steel fiber content, which could be explained by the air voids distribution characteristics of SFAM specimens. On the contrary, SFAM showed excellent low-temperature cracking resistance and fatigue performance. Combining the above results, it is recommended to use 1.0% curved hook steel fiber to reinforce asphalt mixture for improving the thermal conductivity and road performances of asphalt mixture. Because of the reduced deformation resistance of SFAM, the cooling performance of SFAM asphalt pavement needs to be investigated in future studies, based on which the rutting depth can be simulated by means of finite element analysis to determine the actual influence of steel fiber on the rutting resistance of asphalt pavement.