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Laboratory investigation on the behavior of ballast stabilized with bitumen-cement mortar
https://orcid.org/0000-0002-8189-5584
Graphical abstract Display Omitted
Highlights The influence of bitumen-cement mortar on mechanical ballast traits has been investigated. Mortar fluidity has a direct relation with cement content, w/c ratio and superplasticizer dosage. Mortar Stabilized Ballast (MSB) configurations were tested using ballast box apparatus. MSB-U configuration showed the best performance in enhancing the ballast mechanical properties. S-N logarithmical equations have presented to determine the settlement of MSB-U configurations.
Abstract In order to obviate the ballast degradation during railway operation and maintenance, many polymeric and bituminous additives have been proposed for bonding the ballast particles. Amongst the proposed methods, utilizing the bitumen-cement mixtures have been less payed attention by researchers. So, in the present study, the bitumen-cement mortar is considered as a possible solution to control the ballast degradation. In this matter, an extensive laboratory test has been carried out on ballast stabilized with bitumen-cement mortar. In the first step to achieve the most suitable mortar mixture design the water to cement weight ratio (w/c) and bitumen to cement weight ratio (b/c) have been varied in the range of 0.55–0.75 and 0.2–0.6 respectively and the mortar performance has been evaluated in two ages of 7 and 28 days on the basis of uniaxial compression tests and flexural strength tests results. Secondly, after exploring the most desirable mortar mixture design, it has been added to the ballast in three different forms: fully saturated ballast with bitumen-cement mortar (MSB-F), ballast stabilized with 15% bitumen-cement mortar (MSB-H), and 10 cm bottom ballast stabilization with bitumen-cement mortar (MSB-U). All three mentioned forms with three different bitumen-cement percentages of 0.2,0.4 and 0,6 have been examined by ballast box test apparatus and their load-settlement behavior have been evaluated under 200,000 cycles of vertical loading. Comparison of the settlement, stiffness, and damping of the samples have shown the best performance of MSP-U in comparison to the others and the bitumen-cement ratio of 0.42 has been introduced as an optimum percentage which can minimize the ballast settlement by 334% and in parallel increase the ballast layer stiffness and damping ratio by 217% and 187%, respectively.
Laboratory investigation on the behavior of ballast stabilized with bitumen-cement mortar
https://orcid.org/0000-0002-8189-5584
Graphical abstract Display Omitted
Highlights The influence of bitumen-cement mortar on mechanical ballast traits has been investigated. Mortar fluidity has a direct relation with cement content, w/c ratio and superplasticizer dosage. Mortar Stabilized Ballast (MSB) configurations were tested using ballast box apparatus. MSB-U configuration showed the best performance in enhancing the ballast mechanical properties. S-N logarithmical equations have presented to determine the settlement of MSB-U configurations.
Abstract In order to obviate the ballast degradation during railway operation and maintenance, many polymeric and bituminous additives have been proposed for bonding the ballast particles. Amongst the proposed methods, utilizing the bitumen-cement mixtures have been less payed attention by researchers. So, in the present study, the bitumen-cement mortar is considered as a possible solution to control the ballast degradation. In this matter, an extensive laboratory test has been carried out on ballast stabilized with bitumen-cement mortar. In the first step to achieve the most suitable mortar mixture design the water to cement weight ratio (w/c) and bitumen to cement weight ratio (b/c) have been varied in the range of 0.55–0.75 and 0.2–0.6 respectively and the mortar performance has been evaluated in two ages of 7 and 28 days on the basis of uniaxial compression tests and flexural strength tests results. Secondly, after exploring the most desirable mortar mixture design, it has been added to the ballast in three different forms: fully saturated ballast with bitumen-cement mortar (MSB-F), ballast stabilized with 15% bitumen-cement mortar (MSB-H), and 10 cm bottom ballast stabilization with bitumen-cement mortar (MSB-U). All three mentioned forms with three different bitumen-cement percentages of 0.2,0.4 and 0,6 have been examined by ballast box test apparatus and their load-settlement behavior have been evaluated under 200,000 cycles of vertical loading. Comparison of the settlement, stiffness, and damping of the samples have shown the best performance of MSP-U in comparison to the others and the bitumen-cement ratio of 0.42 has been introduced as an optimum percentage which can minimize the ballast settlement by 334% and in parallel increase the ballast layer stiffness and damping ratio by 217% and 187%, respectively.
Laboratory investigation on the behavior of ballast stabilized with bitumen-cement mortar
https://orcid.org/0000-0002-8189-5584
Graphical abstract Display Omitted
Highlights The influence of bitumen-cement mortar on mechanical ballast traits has been investigated. Mortar fluidity has a direct relation with cement content, w/c ratio and superplasticizer dosage. Mortar Stabilized Ballast (MSB) configurations were tested using ballast box apparatus. MSB-U configuration showed the best performance in enhancing the ballast mechanical properties. S-N logarithmical equations have presented to determine the settlement of MSB-U configurations.
Abstract In order to obviate the ballast degradation during railway operation and maintenance, many polymeric and bituminous additives have been proposed for bonding the ballast particles. Amongst the proposed methods, utilizing the bitumen-cement mixtures have been less payed attention by researchers. So, in the present study, the bitumen-cement mortar is considered as a possible solution to control the ballast degradation. In this matter, an extensive laboratory test has been carried out on ballast stabilized with bitumen-cement mortar. In the first step to achieve the most suitable mortar mixture design the water to cement weight ratio (w/c) and bitumen to cement weight ratio (b/c) have been varied in the range of 0.55–0.75 and 0.2–0.6 respectively and the mortar performance has been evaluated in two ages of 7 and 28 days on the basis of uniaxial compression tests and flexural strength tests results. Secondly, after exploring the most desirable mortar mixture design, it has been added to the ballast in three different forms: fully saturated ballast with bitumen-cement mortar (MSB-F), ballast stabilized with 15% bitumen-cement mortar (MSB-H), and 10 cm bottom ballast stabilization with bitumen-cement mortar (MSB-U). All three mentioned forms with three different bitumen-cement percentages of 0.2,0.4 and 0,6 have been examined by ballast box test apparatus and their load-settlement behavior have been evaluated under 200,000 cycles of vertical loading. Comparison of the settlement, stiffness, and damping of the samples have shown the best performance of MSP-U in comparison to the others and the bitumen-cement ratio of 0.42 has been introduced as an optimum percentage which can minimize the ballast settlement by 334% and in parallel increase the ballast layer stiffness and damping ratio by 217% and 187%, respectively.
Laboratory investigation on the behavior of ballast stabilized with bitumen-cement mortar
Esmaeili, Morteza (author) / Paricheh, Mohsen (author) / Esfahani, Milad Hossein (author)
2020-02-08
Article (Journal)
Electronic Resource
English
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