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Statements

Subject Item
n2:RIV%2F68407700%3A21110%2F12%3A00195598%21RIV13-MSM-21110___
rdf:type
skos:Concept n18:Vysledek
dcterms:description
The triaxial testing units allow determination of strength parameters of granular materials such as soils and aggregates. Commonly, the triaxial cells are designed for testing specimens with diameter of up to 150 mm, and thus for testing materials with maximum grain size of approx. 30 mm. At some European universities large triaxial testing units capable of testing specimens with diameter of 200 to 625 mm were developed. Considering the minimum required diameter of the specimen, which should be 5 times the maximum grain size, triaxial cells capable of testing specimens with diameter of 300 mm might be also used for testing railway ballast. This article states the experience with laboratory testing of different types of aggregates for railway ballast in a large scale conventional triaxial cell, which were gained during a research stay at the Norwegian University of Technology and Science. The laboratory tests performed were mainly focused on determination of strength parameters of aggregates and evaluation of effects of dynamic loading on aggregates wear. Each sample, which was blended according to the exact gradation, experienced 1 000 000 loading cycles. The load applied to the specimen corresponded to a stress affecting the railway ballast under the sleeper, if considering an axle load of 25 t. The axial and the radial strain were measured and the Youngs modulus was evaluated during the loading. After finishing the cyclic loading, the specimen was dismounted, the sieve analysis was carried out and the variation of gradation was evaluated. Apart from the triaxial testing, also other physical parameters of the aggregates were determined, such as the volume density, the resistance to fragmentation (Los Angeles test) and the resistance to wear (micro-Deval). For laboratory testing, three materials with different origin and different expected parameters were selected. All materials were of the same gradation 22.4/63 mm. The triaxial testing units allow determination of strength parameters of granular materials such as soils and aggregates. Commonly, the triaxial cells are designed for testing specimens with diameter of up to 150 mm, and thus for testing materials with maximum grain size of approx. 30 mm. At some European universities large triaxial testing units capable of testing specimens with diameter of 200 to 625 mm were developed. Considering the minimum required diameter of the specimen, which should be 5 times the maximum grain size, triaxial cells capable of testing specimens with diameter of 300 mm might be also used for testing railway ballast. This article states the experience with laboratory testing of different types of aggregates for railway ballast in a large scale conventional triaxial cell, which were gained during a research stay at the Norwegian University of Technology and Science. The laboratory tests performed were mainly focused on determination of strength parameters of aggregates and evaluation of effects of dynamic loading on aggregates wear. Each sample, which was blended according to the exact gradation, experienced 1 000 000 loading cycles. The load applied to the specimen corresponded to a stress affecting the railway ballast under the sleeper, if considering an axle load of 25 t. The axial and the radial strain were measured and the Youngs modulus was evaluated during the loading. After finishing the cyclic loading, the specimen was dismounted, the sieve analysis was carried out and the variation of gradation was evaluated. Apart from the triaxial testing, also other physical parameters of the aggregates were determined, such as the volume density, the resistance to fragmentation (Los Angeles test) and the resistance to wear (micro-Deval). For laboratory testing, three materials with different origin and different expected parameters were selected. All materials were of the same gradation 22.4/63 mm.
dcterms:title
Triaxial Testing of Aggregates for Railway Ballast Triaxial Testing of Aggregates for Railway Ballast
skos:prefLabel
Triaxial Testing of Aggregates for Railway Ballast Triaxial Testing of Aggregates for Railway Ballast
skos:notation
RIV/68407700:21110/12:00195598!RIV13-MSM-21110___
n18:predkladatel
n19:orjk%3A21110
n3:aktivita
n14:S
n3:aktivity
S
n3:dodaniDat
n17:2013
n3:domaciTvurceVysledku
n16:4052269
n3:druhVysledku
n9:D
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
175173
n3:idVysledku
RIV/68407700:21110/12:00195598
n3:jazykVysledku
n13:eng
n3:klicovaSlova
triaxial testing; railway ballast; cyclic loading; Young's modulus; aggregates
n3:klicoveSlovo
n7:triaxial%20testing n7:aggregates n7:cyclic%20loading n7:railway%20ballast n7:Young%27s%20modulus
n3:kontrolniKodProRIV
[5B11E3857443]
n3:mistoKonaniAkce
Poznaň
n3:mistoVydani
Poznaň
n3:nazevZdroje
Proceedings of the 5th International Interdisciplinary Technical Conference of Young Scientists
n3:obor
n6:JN
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
1
n3:rokUplatneniVysledku
n17:2012
n3:tvurceVysledku
Kučera, Petr
n3:typAkce
n11:WRD
n3:zahajeniAkce
2012-05-16+02:00
s:numberOfPages
4
n12:hasPublisher
Uczelniany Samorzad Doktorantów Politechniki Poznanskiej
n5:isbn
978-83-926896-4-5
n15:organizacniJednotka
21110