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Degradation of crumb rubber modified railway ballast under impact loading considering aggregate gradation and rubber size
Canadian Geotechnical Journal ( IF 3.6 ) Pub Date : 2021-02-10 , DOI: 10.1139/cgj-2019-0596
Mehdi Koohmishi 1, 1 , Alireza Azarhoosh 1, 1
Affiliation  

Canadian Geotechnical Journal, Ahead of Print.
Impact loads generated from the dynamic effect of passing trains can exacerbate the degradation level of ballast aggregate of railway track. To diminish the induced impact loads, the use of crumb rubber (CR) in the ballast course is characterized as a well-established procedure related to the modification of utilized material. Nonetheless, more in-depth assessments of size and percentage of CR particles combined with ballast aggregate are still required. The present study evaluates the influence of size and content of CR particles used for degradation reduction of ballast aggregate subjected to impact loading. For this purpose, a large-scale impact loading test is carried out on prepared specimens of aggregate by considering the initial gradation, subgrade condition, as well as the size and content of CR particles. The results indicate less ballast degradation for a higher percentage of CR particles. Meanwhile, the enhancement of rubber modified ballast against deterioration is further highlighted in the case of rigid subgrade. In addition, incorporation of larger-sized CR particles (12.5–25 mm) in a ballast specimen comprising more uniform gradation of aggregate can more effectively diminish the amount of degradation. Nevertheless, using smaller-sized CR particles (4.75–9.5 mm) for a ballast sample consisting of a broader range of sizes can better improve resistance against degradation.


中文翻译:

考虑骨料级配和胶粒尺寸的冲击负荷下碎胶改性铁路道ast的降解

加拿大岩土工程杂志,预印本。
过车列车的动力作用产生的冲击载荷会加剧铁路道ball道aggregate骨料的退化程度。为了减少所引起的冲击负荷,压载舱中使用碎屑橡胶(CR)的特征是与改性所用材料有关的成熟程序。尽管如此,仍然需要对CR颗粒与压载骨料结合的尺寸和百分比进行更深入的评估。本研究评估了CR颗粒的尺寸和含量对冲击负荷下压载aggregate石的降解降低的影响。为此,通过考虑初始等级,路基条件以及CR颗粒的尺寸和含量,对准备好的骨料样品进行大规模冲击载荷试验。结果表明,对于较高百分比的CR颗粒,镇流器的降解较少。同时,在刚性路基的情况下,橡胶改性道ast的抗老化性能得到了进一步提高。此外,在压载物试样中掺入较大尺寸的CR颗粒(12.5–25 mm)时,可得到更均匀的骨料级配,可更有效地减少降解量。但是,对于包含较大尺寸范围的镇流器样品,使用较小尺寸的CR颗粒(4.75-9.5 mm)可以更好地提高抗降解性。包含更均匀的骨料级分的压载样品中的5-25毫米)可以更有效地减少降解量。但是,对于包含较大尺寸范围的镇流器样品,使用较小尺寸的CR颗粒(4.75-9.5 mm)可以更好地提高抗降解性。包含更均匀的骨料级分的压载样品中的5-25毫米)可以更有效地减少降解量。但是,对于包含较大尺寸范围的镇流器样品,使用较小尺寸的CR颗粒(4.75-9.5 mm)可以更好地提高抗降解性。
更新日期:2021-02-11
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