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Effect of density and moisture content on the resilient response of unbound granular material
Thesis (PhD)--University of Pretoria, 2013.
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| Format: | Thesis |
| Language: | Eng |
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University of Pretoria
2014
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| _version_ | 1867613629937876992 |
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| access_status_str | Open Access |
| author2 | Steyn, Wynand J.vdM. |
| author_browse | Steyn, Wynand J.vdM. |
| author_facet | Steyn, Wynand J.vdM. |
| collection | Thesis |
| dc_rights_str_mv | © 2013 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 | Thesis (PhD)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/32954 |
| institution | University of Pretoria (South Africa) |
| language | Eng |
| last_indexed | 2026-06-10T12:39:11.828Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| 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:2263/32954 Effect of density and moisture content on the resilient response of unbound granular material Steyn, Wynand J.vdM. Theyse, Hechter L. Van Aswegen, Elsabe Unbound granular material Pavement structure Natural material Moisture Density UCTD Thesis (PhD)--University of Pretoria, 2013. Unbound granular material is used in the pavement structure and usually comprises the bulk of the structural and foundation layers of a typical South African pavement. The term ‘unbound granular material’ refers to the classification of natural material, which has not been modified in any way. Various mechanistic-empirical models for the resilient response of unbound granular material have been developed over the years. However, few have incorporated important influencing parameters such as moisture or density on the basic stress-strain relationship or linked variables of the models to basic engineering properties of unbound granular material. This study builds on previous work by Theyse (2008a) and the cord modulus model developed by Theyse (2012). The Theyse (2012) model was selected to be further investigated, since it modelled the trends observed in the data realistically. The model depicts the stress dependent behaviour of unbound granular material, where an increase initial modulus is observed for increasing confinement pressure, as well as initial stress-softening with increasing stress ratio followed by stress stiffening. The model was calibrated for all bulk material samples under consideration in this thesis. The calibration process included linking variables of the model to mathematical functions that approximate the trends observed when variables were considered against level of saturation. A parametric analysis indicated that the saturation and stress-dependent cord modulus model realistically predict material behaviour. The saturation and stress-dependent cord modulus model was refined further and calibrated for crushed and natural unbound granular material. This refinement did not negatively influence the accuracy or ability to realistically predict the material behaviour. Basic material properties could be linked to predictive statistical distributions that could estimate the range of modulus values that can be expected for the material under consideration. However, the variables of the saturation and stress-dependent cord modulus model could not be linked to basic material properties due to the limit set of results available. gm2013 Civil Engineering unrestricted 2014-01-09T11:14:23Z 2014-01-09T11:14:23Z 2013-09-04 2013 Thesis Van Aswegen, E. 2013, Effect of density and moisture content on the resilient response of unbound granular material, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/32954> D13/9/1045/gm http://hdl.handle.net/2263/32954 Eng © 2013 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 | Unbound granular material Pavement structure Natural material Moisture Density UCTD Effect of density and moisture content on the resilient response of unbound granular material |
| title | Effect of density and moisture content on the resilient response of unbound granular material |
| title_full | Effect of density and moisture content on the resilient response of unbound granular material |
| title_fullStr | Effect of density and moisture content on the resilient response of unbound granular material |
| title_full_unstemmed | Effect of density and moisture content on the resilient response of unbound granular material |
| title_short | Effect of density and moisture content on the resilient response of unbound granular material |
| title_sort | effect of density and moisture content on the resilient response of unbound granular material |
| topic | Unbound granular material Pavement structure Natural material Moisture Density UCTD |
| url | http://hdl.handle.net/2263/32954 |