Investigation of graphite tailings as a substitute for filler in asphalt mastics

Yang, Xuan; Fan, Zepeng; Xu, Jiaqiu; Lin, Jia; He, Yulin; Wang, Dawei; Liu, Pengfei

doi:10.1080/10298436.2023.2172578

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…Figure 8 shows the chemical composition of the three mineral fillers. The main chemical component of limestone filler is CaO, and the main chemical component of the two iron tailings filler is SiO 2 , occupying about 68%, so the ITs are acidic [ 29 ]; the content of Al 2 O 3 and Fe 2 O 3 in iron tailings filler is slightly higher than that of limestone filler. Mineral composition analysis and chemical composition analysis lay the foundation for the subsequent establishment of the mineral molecular model.…”

Section: Resultsmentioning

confidence: 99%

“…In terms of the 5 µm~30 µm part, limestone filler accounts for 30%, and IT accounts for about 12%; the proportion of ultra-fine powder in limestone is about three times that of iron tailings. On the whole, the limestone mineral filler is finer than the IT filler and has a higher contact area with asphalt [29]. Figure 5 shows the particle size distribution of limestone and two types of iron tailing fillers.…”

Section: Gray Correlation Analysis Of Influencing Factors Of Fatigue ...mentioning

confidence: 99%

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Iron Tailings as Mineral Fillers and Their Effect on the Fatigue Performance of Asphalt Mastic

Cui,

Si,

et al. 2024

Materials

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Incorporating iron tailings (ITs) into asphalt represents a new method for waste-to-resource conversion. The objective of this study is to evaluate the fatigue performance of ITs as fillers in asphalt mastic and investigate the interaction and interfacial adhesion energy between asphalt and ITs. To achieve that, the particle size distributions of two ITs and limestone filler (LF) were tested through a laser particle size analyzer; the morphology and structure characteristics were obtained by scanning electronic microscopy (SEM), the mineral compositions were conducted through X-ray diffraction (XRD), and the chemical compositions were tested through X-ray Fluorescence Spectrometer (XRF). Furthermore, the fatigue properties of asphalt mastic and the interaction between asphalt binder and mineral fillers (ITs and LFs) were evaluated by Dynamic Shear Rheometer (DSR). The interfacial adhesion energy between ITs and asphalt binder were calculated through molecular dynamics simulation. In the end, the correlation between the test results and the fatigue life is established based on the gray correlation analysis, the environmental and economic benefits of iron tailings asphalt pavement are further evaluated. The results show that the particle size distribution of ITs is concentrated between 30 μm and 150 μm, and the main component is quartz. ITs have rich angularity and a higher interaction ability with asphalt. The adhesion energy of iron tailings filler to asphalt is less than that of limestone. The correlation degree of the interfacial adhesion energy and interaction between asphalt and mineral filler with asphalt mastic fatigue life is close to 0.58. Under the combined action of interaction ability and interfacial adhesion energy, the fatigue life of IT asphalt mastic meets the requirements. ITs as a partial replacement for mineral fillers in asphalt pavement have great environmental and social effectiveness.

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Section: Resultsmentioning

confidence: 99%

Section: Gray Correlation Analysis Of Influencing Factors Of Fatigue ...mentioning

confidence: 99%

Iron Tailings as Mineral Fillers and Their Effect on the Fatigue Performance of Asphalt Mastic

Cui,

Si,

et al. 2024

Materials

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“…Therefore, the effective recycling of graphite tailings is significant for environmental protection research. At present, graphite tailings are being applied in the field of building materials, such as environmentally friendly concrete and pavements material [10,11]. Fu et al [12] prepared a graphite tailing sand-semi-coke composite anode with a high multiplication rate, long cycle life, and low cost, thereby realizing the highvalue utilization of graphite tailing sand.…”

Section: Introductionmentioning

confidence: 99%

Performance and Heavy Metal Analysis of Graphite Tailings Cured Using Cementitious Materials

Jiang,

Wang

2024

Buildings

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The massive accumulation of graphite tailings causes serious environmental pollution, mainly from heavy metal pollution. Therefore, this article introduces a method of using graphite tailings as a high-content main material, cement as a small component of the auxiliary cementitious material, and clay as a substitute for cement. The compressive strength and permeability of graphite tailing–solidified material (GT, GT–Clay) were tested, and the effect of clay partially replacing cement as an auxiliary cementitious agent on GT–Clay performance was compared. In addition, inductively coupled plasma mass spectrometry (ICP) was used to analyze the effect of the graphite tailing placement time on the heavy metal content, as well as the changes in the GT heavy metal leaching concentration and its heavy metal content under outdoor freeze–thaw conditions. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to elucidate the microstructural changes in the GT–Clay. The experimental results show that, as the substitution of clay for cement increased from 0 to 50%, the compressive strength of the 90% GT–Clay gradually decreased, and the permeability also increased. The compressive strength of 95% GT–Clay did not show significant changes, but the permeability increased, and when mixed with quicklime, gypsum, and silica fume, the permeability decreased. The Ni and As in graphite tailings fluctuated significantly with the placement time. The heavy metal leaching concentrations of the 90% GT and 95% GT were below the standard limit, and Cd, As, and Ni in GT were potential sources of pollution. The analysis of the microscopic test results showed that the hydration products of the GT–Clay included ettringite, Ca(OH)2, and calcium silicate hydrates. The hydration product stabilized and filled the gaps between the tailing particles, thereby cementing them together. Not only did it improve the mechanical strength of GT, it also reduced the permeability and heavy metal leaching rate. This study provides a new analytical approach to applying graphite tailings for environmental treatment.

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Bearing capacity mechanism of soilbagged graphite tailings

Du,

Xu,

et al. 2023

Bull Eng Geol Environ

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Investigation of graphite tailings as a substitute for filler in asphalt mastics

Cited by 11 publications

References 40 publications

Iron Tailings as Mineral Fillers and Their Effect on the Fatigue Performance of Asphalt Mastic

Iron Tailings as Mineral Fillers and Their Effect on the Fatigue Performance of Asphalt Mastic

Performance and Heavy Metal Analysis of Graphite Tailings Cured Using Cementitious Materials

Bearing capacity mechanism of soilbagged graphite tailings

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