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Title: A proposal for molding of reduced scale ballast samples for repeated load triaxial tests
Other Titles: Proposition de préraration d'échantillons de ballast à échelle réduit pour essais triaxiaux de charge répétés
Authors: Delgado, B.
Fonseca, A.
Fortunato, E.
Paixão, A.
Coelho, D.
Keywords: Railway ballast;Cyclic load triaxial tests;Reduced scale samples;Specimen molding
Issue Date: Dec-2017
Publisher: IFSTTAR
Abstract: Considering the high costs involved in laboratory analysis of rail ballast geomechanical behaviour, several researchers have been discussing the possibility of using reduced scale samples. This paper presents a method for molding and densify reduced scale ballast samples in a ratio of 1:2,5 for cyclic triaxial tests as an alternative to fresh ballast material, with the purpose to achieve densify levels compatible with the compaction levels of railway lines in service. The results reveal that the the moulded specimens have kept the integrity of the latex membrane and presented an initial void ratio close to those obtained by dynamic or vibratory compaction methods found in technical literature. Additionally these specimens have been tested in monotonic triaxial tests and have revealed a dilatant behavior, as should be expected in materials with a good compaction level.
ISBN: 978-2-85782-739-9
Appears in Collections:DT/NIT - Comunicações a congressos e artigos de revista

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