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<p>Coal-based synthetic natural gas slag (CNS), a solid waste generated from the production process of natural gas, is significantly increasing in reserves every year. Therefore, it is necessary to expand the application scope of CNS and increase its consumption. For this, this study explores the feasibility of using CNS powder (CNP) as a substitute filler for the preparation of asphalt mastic. On this basis, the substitution effect of CNP was evaluated by using PC42.5 cement (PCC) as a traditional substitute filler and limestone powder (LSP) as a traditional mineral filler. Various methods such as laser particle size analyzer, scanning electron microscopy, X-ray fluorescence spectroscopy, and physical performance tests were used to characterize the properties of the three powders. Subsequently, rheological tests, fourier transform infrared spectroscopy (FTIR) test and surface free energy (SFE) test were conducted to evaluate the service performance of the asphalt mastic. The results showed that CNP and PCC enhanced the high temperature performance, rutting resistance and fatigue performance of asphalt mastic due to LSP. Particularly, PCC would cause the deterioration of low temperature performance, whereas CNP exhibited the opposite effect. Several fillers were merely physical mixed with asphalt binder, and the new characteristic peaks appeared in asphalt mastics were derived from the fillers. The interaction between CNP and asphalt binder was slightly lower than LSP, but significantly higher than PCC. The incorporation of fillers resulted in a change of contact angle of asphalt binder, the enhancement effect of CNP on the cracking resistance and adhesion properties of asphalt mastic under different conditions was superior to PCC and LSP, and limestone showed more reliable adhesion properties with several asphalt mastics compared to granite. This study explored an effective option to utilize CNS as a substitute material for sustainable asphalt pavements, which could promote the resourceful use of solid waste to a certain degree.</p>

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Utilization of Waste Coal-Based Synthetic Natural Gas Slag as a Substitute Filler in Asphalt Mastics: Filler Properties, Rheological Properties and Adhesion Properties

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Peng Yin,
  • Tianling Dong,
  • Baofeng Pan,
  • Yue Liu

摘要

Coal-based synthetic natural gas slag (CNS), a solid waste generated from the production process of natural gas, is significantly increasing in reserves every year. Therefore, it is necessary to expand the application scope of CNS and increase its consumption. For this, this study explores the feasibility of using CNS powder (CNP) as a substitute filler for the preparation of asphalt mastic. On this basis, the substitution effect of CNP was evaluated by using PC42.5 cement (PCC) as a traditional substitute filler and limestone powder (LSP) as a traditional mineral filler. Various methods such as laser particle size analyzer, scanning electron microscopy, X-ray fluorescence spectroscopy, and physical performance tests were used to characterize the properties of the three powders. Subsequently, rheological tests, fourier transform infrared spectroscopy (FTIR) test and surface free energy (SFE) test were conducted to evaluate the service performance of the asphalt mastic. The results showed that CNP and PCC enhanced the high temperature performance, rutting resistance and fatigue performance of asphalt mastic due to LSP. Particularly, PCC would cause the deterioration of low temperature performance, whereas CNP exhibited the opposite effect. Several fillers were merely physical mixed with asphalt binder, and the new characteristic peaks appeared in asphalt mastics were derived from the fillers. The interaction between CNP and asphalt binder was slightly lower than LSP, but significantly higher than PCC. The incorporation of fillers resulted in a change of contact angle of asphalt binder, the enhancement effect of CNP on the cracking resistance and adhesion properties of asphalt mastic under different conditions was superior to PCC and LSP, and limestone showed more reliable adhesion properties with several asphalt mastics compared to granite. This study explored an effective option to utilize CNS as a substitute material for sustainable asphalt pavements, which could promote the resourceful use of solid waste to a certain degree.