Effects of Steel-Slag Components on Interfacial-Reaction Characteristics of Permeable Steel-Slag–Bitumen Mixture

Abstract

In this paper, a permeable steel-slag–bitumen mixture (PSSBM) was first prepared according to the designed mixture ratio. Then, the interaction characteristics between steel slag and bitumen were studied. The chemical interaction between bitumen and steel slag was explored with a Fourier-transform infrared spectrometer (FT-IR). The influence of steel-slag chemistry, mineral composition, and bitumen reaction on phase angle, complex shear modulus (CSM), and rutting factor was explored with dynamic shear rheological (DSR) tests. The PSSBM had better properties, including high permeability, water stability, Marshall stability, high-temperature (HT) stability, and low volume-expansion rate. Bitumen-coated steel slag can prevent heavy-metal ions from leaching. In the infrared spectra of the mixture of a chemical component of steel slag (calcium oxide) and bitumen, a new absorption peak at 3645 cm−1 was ascribed to the SiO–H stretching vibration, indicating that new organic silicon compounds were produced in the chemical reaction between calcium oxide and bitumen. SiO–H had an obvious enhancement effect on the interfacial adhesion and high-temperature rheological property of the mixture. In the mineral components of steel slag, dicalcium and tricalcium silicate reacted with bitumen and generated new substances. Chemical reactions between tricalcium silicate and bitumen were significant and had obvious enhancement effects on interfacial adhesion and high-temperature rheological properties of the mixture. The results of FT-IR and DSR were basically consistent, which revealed the chemical-reaction mechanism between steel-slag microcomponents and bitumen at the interface. SEM results showed that pits and grooves on the surface of the steel-slag aggregate, and the textural characteristics provide a framework-like function, thus strengthening the strength and adhesion of the steel-slag–bitumen aggregate interface.

New EAF Slag Characterization Methodology for Strategic Metal Recovery

“…Selected studies [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ] of numerous recent research works reported to the scientific journal Materials were devoted to the use and incorporation of steel slags in road construction materials and concrete. The BOF slag incorporated in the asphalt mixture is advantageous for improving the ability of this mixed material to resist the deformation and enhancing the stability of structure, according to Ye et al [ 12 ].…”

“…Dondi et al [15] stated that the asphalt mixture containing 30 % of steel slag is characterized by high stability and stiffness. Liu et al [14] suggested that pits and grooves on the surface of steel-slag particles provided a skeleton-like function for the bitumen-steel slag aggregate interface improving the adhesion strength of the bitumen-steel slag aggregate interface.…”

Research on the Interaction Capability and Microscopic Interfacial Mechanism between Asphalt-Binder and Steel Slag Aggregate-Filler

“…These active substances were rich in alkali aggregates but less in acidic aggregates, whilst the active substances in the neutral aggregates were in between with a pH around seven [74,75]. The major mineral components of steel slag were calcium hydroxide, RO phase dicalcium silicate, and tricalcium silicate, which made the steel slag more alkaline than basalt and able to react with the acid anhydride in asphalt-binder [76]. Therefore, compared with the basalt aggregates, the chemical reactions between the steel slag aggregates and the asphalt-binder were stronger as well as the corresponding interactions, which explains the superior interaction ability associated with the steel slag mortar.…”

Study on the Melting Temperature of CaF2-CaO-MgO-Al2O3-TiO2 Slag under the Condition of a Fixed Ratio of Titanium and Aluminum in the Steel during the Electroslag Remelting Process

“…In order to investigate the thermodynamic equilibrium of SUS321 steel and slag S0-F1(F2) further, the activity coefficients of Ti and Al in steel are calculated by Equation (3) and the value of is considered as −0.12. The interaction parameters [ 24 , 25 , 26 ] used in present study are listed in Table 5 . The activity coefficients of TiO 2 and Al 2 O 2 in slag are calculated based on Factsage 7.3-FToxid FactPS.…”