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Laboratory study on degradation of ballast mixed with crumb rubber under impact loads

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  • Fuguang Zhang
  • Jianmei Chang
  • Huaiping Feng

Abstract

This paper evaluates the effect of crumb rubber (CR) on degradation reduction of ballast aggregates subjected to impact loads. A drop-weight impact testing apparatus was developed to test ballast mixed with CR. The probability of corner breakage and bulk fracture was investigated, and the material loss and change in sphericity were identified. The results show that, as CR percentage increases, the corner breakage probability increases first and then decreases, while the bulk fracture probability decreases. The effect of CR on the former is less than that on the latter. The degradation probability of the particles in the size range of 35.5 ~ 45 mm or that of non-cubic shapes is most influenced by CR. The material loss and change in sphericity decrease with increasing CR percentage, and the effect of CR is greatest for the particles in the size range of 25 ~ 35.5 mm and independent of particle shape.

Suggested Citation

  • Fuguang Zhang & Jianmei Chang & Huaiping Feng, 2023. "Laboratory study on degradation of ballast mixed with crumb rubber under impact loads," International Journal of Rail Transportation, Taylor & Francis Journals, vol. 11(5), pages 767-789, September.
    • Handle: RePEc:taf:tjrtxx:v:11:y:2023:i:5:p:767-789
    DOI: 10.1080/23248378.2022.2108151
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