Abstract
Porous asphalt mixtures with steel slag (PAM-SS), as an eco-friendly and low-cost pavement material, are conducive to addressing the issue of urban floods and natural resource shortages. The primary objective of this paper was to explore the feasibility of the application of PAM-SS for seasonal frozen regions, and ascertain the optimal replacement percentage of natural aggregate. Steel slag coarse aggregate (SSCA) was used to replace basalt coarse aggregate (BCA) at four levels (25%, 50%, 75%, 100%) by equal volume. The volume characteristics, mechanical properties, low-temperature cracking resistance, water stability, and freeze-thaw (F-T) durability of the mixture were assessed. The results indicated that the low-temperature cracking resistance of the mixture was significantly enhanced and acoustic emission (AE) energy was uniformly released by the incorporation of steel slag. Furthermore, the porosity, permeability, Marshall stability (MS), and the resistance against water damage and F-T cycles were also significantly improved. Based on the experimental results, the complete replacement of natural aggregate is advisable to obtain an optimal overall performance.
Highlights
With the development of urbanization and expansion of urban agglomeration, artificial impermeable pavement has occupied the urban surface at a large scale, blocking the natural infiltration process of rainwater [1]
The chemical composition, microstructure, and surface characteristics of steel slag aggregate were analyzed by X-ray diffraction, mercury intrusion method, and scanning electron microscopy (SEM), respectively, and the results showed that it is a kind of microporous material [13]
The results reported that the addition of steel slag effectively improved the Marshall stability (MS) and fatigue life and reduced permanent deformation of the asphalt mixture, but the low-temperature cracking resistance was not taken into consideration
Summary
With the development of urbanization and expansion of urban agglomeration, artificial impermeable pavement has occupied the urban surface at a large scale, blocking the natural infiltration process of rainwater [1]. Porous asphalt mixture (PAM), as a sustainable pavement material for cities, has been developed and applied to parking lots and light traffic pavement due to its potential for alleviating “urban syndrome”. Compared with dense-gradation asphalt mixture (DGAM), the high porosity (18–25%) characteristics of PAM make it more competitive in reducing surface stormwater runoff, replenishing groundwater, mitigating the UHI effect, absorbing traffic noise, and improving wet-surface slip resistance [4,5,6]. The poor cracking resistance and durability caused by its internal porous structure have become barriers against the wide application of PAM for seasonal frozen regions [4,5]. How to improve the low-temperature cracking resistance and freeze-thaw (F-T) durability of PAM for seasonal frozen regions without significantly compromising its permeability has become a research hotspot in this field nowadays
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
