Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests
Dissertation (MEng)--University of Pretoria, 2015.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2016
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613634004254720 |
|---|---|
| access_status_str | Open Access |
| author2 | Grabe, P.J. (Hannes) |
| author_browse | Grabe, P.J. (Hannes) |
| author_facet | Grabe, P.J. (Hannes) |
| collection | Thesis |
| dc_rights_str_mv | © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/57518 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:15.557Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/57518 Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests Grabe, P.J. (Hannes) u29015597@tuks.co.za Du Plooy, Rudolph UCTD Reinforced ballast Rigid polyurethane foam Box tests Railway ballast Rail infrastructure Material characterization Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Dissertation (MEng)--University of Pretoria, 2015. Train speeds and heavy haul axle loads are constantly increasing the forces and stresses experienced by track structures. This is especially true for track transitions that generate high dynamic forces on both the track and vehicles as a result of differing track stiffness values on either side of the track transition. Reducing differential settlement between the two track structures at a track transition is one method of improving the life of the track and increasing maintenance intervals. Ballast attrition and breakdown at these track transition zones is also of major concern as ballast fouling can lead to reduced drainage performance of the ballast as well as a potential loss of strength as the ballast becomes increasingly fouled. In this study rigid polyurethane foam was used as a means to reinforce ballast. Various tests were conducted using a dynamic load hydraulic load frame in a large ballast box test at heavy haul axle loads. Unreinforced, reinforced and 50 % reinforced ballast layers of 300 mm depth were tested to approximately 5,000,000 load cycles. The results showed that rigid polyurethane foam reinforced ballast exhibited in the order of 60 % less settlement for a fully reinforced layer and 42 % less settlement for a half reinforced layer. The increase in layer stiffness with increasing load cycles was also observed for the reinforced ballast layers which is contrast with the decrease in layer stiffness for conventional unreinforced ballast. The use of rigid polyurethane foam (RPF) to reinforce ballast has a number of benefits which could result in better track geometry and longer maintenance cycles resulting in lower overall costs. tm2016 mi2025 Civil Engineering MEng Unrestricted SDG-09: Industry, innovation and infrastructure SDG-11: Sustainable cities and communities SDG-12: Responsible consumption and production 2016-10-27T07:28:48Z 2016-10-27T07:28:48Z 2016-09-01 2015 Dissertation Du Plooy, R 2015, Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/57518> S2016 http://hdl.handle.net/2263/57518 en © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Reinforced ballast Rigid polyurethane foam Box tests Railway ballast Rail infrastructure Material characterization Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title | Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title_full | Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title_fullStr | Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title_full_unstemmed | Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title_short | Characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| title_sort | characterisation of rigid polyurethane foam reinforced ballast through cyclic loading box tests |
| topic | UCTD Reinforced ballast Rigid polyurethane foam Box tests Railway ballast Rail infrastructure Material characterization Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production |
| url | http://hdl.handle.net/2263/57518 |