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Time-dependant behaviour of engineered cement-based composites
Thesis (PhD (Civil Engineering))--University of Stellenbosch, 2007.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2007
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| _version_ | 1867613956329177088 |
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| access_status_str | Open Access |
| author | Boshoff, William Peter |
| author2 | Van Zijl, G. P. A. G. |
| author_browse | Boshoff, William Peter Van Zijl, G. P. A. G. |
| author_facet | Van Zijl, G. P. A. G. Boshoff, William Peter |
| author_sort | Boshoff, William Peter |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (PhD (Civil Engineering))--University of Stellenbosch, 2007. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/1249 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:44:22.712Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2007 |
| publishDateRange | 2007 |
| publishDateSort | 2007 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/1249 Time-dependant behaviour of engineered cement-based composites Boshoff, William Peter Van Zijl, G. P. A. G. University of Stellenbosch. Faculty of Engineering. Dept. of Civil Engineering. Dissertations -- Civil engineering Theses -- Civil engineering Fiber-reinforced concrete Cement composites Thesis (PhD (Civil Engineering))--University of Stellenbosch, 2007. ECC (Engineered Cement-based Composites) is a type of HPC (High Performance Concrete) that was engineered to overcome the weaknesses of ordinary concrete. It shows high ductility as it can resist the full tensile load at a strain of more than 3 %. This superior response is achieved with multiple cracking under tensile loading which has a pseudo strain hardening phenomenon as result. The purpose of the research project reported in this dissertation is to investigate and characterise the time-dependant behaviour of ECC and create a constitutive model to numerically simulate the static and time-dependant behaviour of ECC. To investigate the time-dependant behaviour experimentally, rate and creep tests were done on the meso- and macro-level while rate tests were done on the structurallevel. The meso-level was represented by the pull-out testing of fibres embedded in the cement-based matrix and direct tensile tests were done for the macro-level. Flexural tests on thin beams were done to simulate the structural-level. Strong time-dependant behaviour was found on all three these levels. On the meso-level, the most prominent finding is that the failure mechanism can change with a change of strain rate, i.e. fibre pull-out at a low pull-out rate, while with a high pullout rate, fibre rupture can occur. Even though the strength of a tensile specimen on the macro-level showed a dependence on the strain rate, the ductility remained constant over four orders of magnitude of the strain rate. On the structural-level, however, a reduction of the flexural ductility was found with an increase of the ... Doctoral 2007-10-31T12:33:56Z 2010-06-01T08:16:27Z 2007-10-31T12:33:56Z 2010-06-01T08:16:27Z 2007-03 Thesis http://hdl.handle.net/10019.1/1249 en University of Stellenbosch 14176778 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Dissertations -- Civil engineering Theses -- Civil engineering Fiber-reinforced concrete Cement composites Boshoff, William Peter Time-dependant behaviour of engineered cement-based composites |
| title | Time-dependant behaviour of engineered cement-based composites |
| title_full | Time-dependant behaviour of engineered cement-based composites |
| title_fullStr | Time-dependant behaviour of engineered cement-based composites |
| title_full_unstemmed | Time-dependant behaviour of engineered cement-based composites |
| title_short | Time-dependant behaviour of engineered cement-based composites |
| title_sort | time dependant behaviour of engineered cement based composites |
| topic | Dissertations -- Civil engineering Theses -- Civil engineering Fiber-reinforced concrete Cement composites |
| url | http://hdl.handle.net/10019.1/1249 |
| work_keys_str_mv | AT boshoffwilliampeter timedependantbehaviourofengineeredcementbasedcomposites |