Abstract
Steel slag is an industrial solid waste with the largest output in the world. It has the characteristics of wear resistance, good particle shape, large porosity, etc. At the same time, it has good adhesion characteristics with asphalt. If steel slag is used in asphalt pavement, it not only solves the problem of insufficient quality aggregates in asphalt concrete, but can also give full play to the high hardness and high wear resistance of steel slag to improve the performance of asphalt pavement. In this study, a steel slag aggregate was mixed with road petroleum asphalt to prepare a permeable steel slag–asphalt mixture, which was then compared with the permeable limestone–asphalt mixture. According to the Technical Regulations for Permeable Asphalt Pavement (CJJT 190-2012), the permeability, water stability, and Marshall stability of the prepared asphalt mixtures were tested and analyzed. In addition, the high-temperature stability and expansibility were analyzed according to the Experimental Regulations for Highway Engineering Asphalt and Asphalt Mixture (JTG E20-2011). The chemical composition of the steel slag was tested and analyzed by X-ray fluorescence spectrometer (XRF). The mineral composition of the steel slag was tested and analyzed by X-ray diffractometer (XRD). The asphalt was analyzed by Fourier transform infrared spectroscopy (FTIR). The results show that the steel slag asphalt permeable mixture had good permeability, water stability, and Marshall stability, as well as good high-temperature stability and a low expansion rate. The main mineral composition was ferroferric oxide, the RO phase (RO phase is a broad solid solution formed by melting FeO, MgO, and other divalent metal oxides such as MnO), dicalcium silicate, and tricalcium silicate. In the main chemical composition of steel slag, there was no chemical reaction between aluminum oxide, calcium oxide, silicon dioxide, and asphalt, while ferric oxide chemically reacted with asphalt and formed new organosilicon compounds. The main mineral composition of the steel slag (i.e., triiron tetroxide, dicalcium silicate, and tricalcium silicate) reacted chemically with the asphalt and produced new substances. There was no chemical reaction between the RO phase and asphalt.
Highlights
With the development of road traffic construction in China, the total length of highways inChina exceeds 4.5 million kilometers, of which the total length of expressways is approximately125,000 kilometers
In the main chemical composition of steel slag, there was no chemical reaction between aluminum oxide, calcium oxide, silicon dioxide, and asphalt, while ferric oxide chemically reacted with asphalt and formed new organosilicon compounds
90% of the completed asphalt pavement is designed according to the principle of dense gradation, which has the characteristics of high strength, low-temperature crack resistance, and strong durability [1]
Summary
With the development of road traffic construction in China, the total length of highways inChina exceeds 4.5 million kilometers, of which the total length of expressways is approximately125,000 kilometers. With the development of road traffic construction in China, the total length of highways in. China exceeds 4.5 million kilometers, of which the total length of expressways is approximately. Asphalt pavement has been widely used in expressways. 90% of the completed asphalt pavement is designed according to the principle of dense gradation, which has the characteristics of high strength, low-temperature crack resistance, and strong durability [1]. The asphalt concrete used in asphalt pavement uses basalt, limestone, and other natural stones as aggregates, and its usage accounts for approximately 95% of the total amount of asphalt. Determining how to find a material that can replace natural stone as an asphalt concrete aggregate from the perspectives of superior performance, economy, and environmental protection has become an important topic in the field of building materials
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