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Degradation mechanism of cement-emulsilfied asphalt mortar in high speed ballestless railway

Kai Yang (UGent) , X.H. Zheng and Geert De Schutter (UGent)
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Abstract
Cement-emulsified asphalt mortar (CA mortar) is a key component of ballastless highspeed rail systems. Theoretically, compared with concrete, CA mortar is more susceptible to acidic attack because of the porous structure, the fewer alkaline substance and the lower interfacial energy of hydrates-asphalt. To clarify the relationship between the acid rain and the degradation mechanism of CA mortar in practical engineering, the microstructure and organic- inorganic compositions of samples from high-speed railway in acid rain region and accelerated tests were investigated and compared respectively. Acidic attack and oxidation aging of asphalt were eliminated via X-ray Powder Diffraction (XRD), Scanning Electron Microscope with energy dispersive X-ray analyzer (SEM-EDAX) and Fourier Transform Infrared Spectroscopy (FTIR). With Thermogravimetric (TG) analysis, a method to qualitatively analyze the relative content of asphalt components in CA mortar was raised, based on the two-component analytical method. And then, another efficient quantitative method to calculate the content of Ca(OH)2 and asphalt in CA mortar was proposed, which is an innovative application of the flexible internal criterion method. It was concluded that the loss of asphalt (especially asphaltenes) was the main reason for the material degradation.
Keywords
Cement-emulsified asphalt mortar, deterioration mechanism, microstructure, acid rain

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MLA
Yang, Kai, et al. “Degradation Mechanism of Cement-Emulsilfied Asphalt Mortar in High Speed Ballestless Railway.” 4th International Conference on Service Life Design for Infrastructures (SLD4) : Proceedings, edited by Guang Ye et al., RILEM, 2018, pp. 941–47.
APA
Yang, K., Zheng, X. H., & De Schutter, G. (2018). Degradation mechanism of cement-emulsilfied asphalt mortar in high speed ballestless railway. In G. Ye, Y. Yuan, C. Romero Rodriguez, H. Zhang, & B. Savija (Eds.), 4th International Conference on Service Life Design for Infrastructures (SLD4) : proceedings (pp. 941–947). Paris: RILEM.
Chicago author-date
Yang, Kai, X.H. Zheng, and Geert De Schutter. 2018. “Degradation Mechanism of Cement-Emulsilfied Asphalt Mortar in High Speed Ballestless Railway.” In 4th International Conference on Service Life Design for Infrastructures (SLD4) : Proceedings, edited by Guang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, and Branko Savija, 941–47. Paris: RILEM.
Chicago author-date (all authors)
Yang, Kai, X.H. Zheng, and Geert De Schutter. 2018. “Degradation Mechanism of Cement-Emulsilfied Asphalt Mortar in High Speed Ballestless Railway.” In 4th International Conference on Service Life Design for Infrastructures (SLD4) : Proceedings, ed by. Guang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, and Branko Savija, 941–947. Paris: RILEM.
Vancouver
1.
Yang K, Zheng XH, De Schutter G. Degradation mechanism of cement-emulsilfied asphalt mortar in high speed ballestless railway. In: Ye G, Yuan Y, Romero Rodriguez C, Zhang H, Savija B, editors. 4th International Conference on Service Life Design for Infrastructures (SLD4) : proceedings. Paris: RILEM; 2018. p. 941–7.
IEEE
[1]
K. Yang, X. H. Zheng, and G. De Schutter, “Degradation mechanism of cement-emulsilfied asphalt mortar in high speed ballestless railway,” in 4th International Conference on Service Life Design for Infrastructures (SLD4) : proceedings, Delft (Nederland), 2018, pp. 941–947.
@inproceedings{8629212,
  abstract     = {{Cement-emulsified asphalt mortar (CA mortar) is a key component of ballastless highspeed
rail systems. Theoretically, compared with concrete, CA mortar is more susceptible to
acidic attack because of the porous structure, the fewer alkaline substance and the lower
interfacial energy of hydrates-asphalt. To clarify the relationship between the acid rain and the
degradation mechanism of CA mortar in practical engineering, the microstructure and
organic- inorganic compositions of samples from high-speed railway in acid rain region and
accelerated tests were investigated and compared respectively.
Acidic attack and oxidation aging of asphalt were eliminated via X-ray Powder Diffraction
(XRD), Scanning Electron Microscope with energy dispersive X-ray analyzer (SEM-EDAX)
and Fourier Transform Infrared Spectroscopy (FTIR). With Thermogravimetric (TG) analysis,
a method to qualitatively analyze the relative content of asphalt components in CA mortar
was raised, based on the two-component analytical method. And then, another efficient
quantitative method to calculate the content of Ca(OH)2 and asphalt in CA mortar was
proposed, which is an innovative application of the flexible internal criterion method. It was
concluded that the loss of asphalt (especially asphaltenes) was the main reason for the
material degradation.}},
  author       = {{Yang, Kai and Zheng, X.H. and De Schutter, Geert}},
  booktitle    = {{4th International Conference on Service Life Design for Infrastructures (SLD4) : proceedings}},
  editor       = {{Ye, Guang and Yuan, Yong and Romero Rodriguez, Claudia and Zhang, Hongzhi and Savija, Branko}},
  isbn         = {{9782351582138}},
  keywords     = {{Cement-emulsified asphalt mortar,deterioration mechanism,microstructure,acid rain}},
  language     = {{eng}},
  location     = {{Delft (Nederland)}},
  pages        = {{941--947}},
  publisher    = {{RILEM}},
  title        = {{Degradation mechanism of cement-emulsilfied asphalt mortar in high speed ballestless railway}},
  year         = {{2018}},
}