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Static and fatigue behaviour of steel and synthetic fibre reinforced concrete
Thesis (MEng)--Stellenbosch University, 2023.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2023
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| _version_ | 1867613918308859904 |
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| access_status_str | Open Access |
| author | Makara, Nyane Patricia |
| author2 | Combrinck, Riaan |
| author_browse | Combrinck, Riaan Makara, Nyane Patricia |
| author_facet | Combrinck, Riaan Makara, Nyane Patricia |
| author_sort | Makara, Nyane Patricia |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2023. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/128656 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:43:46.817Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/128656 Static and fatigue behaviour of steel and synthetic fibre reinforced concrete Makara, Nyane Patricia Combrinck, Riaan Fataar, Humaira Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Reinforced concrete Materials -- Fatigue Concrete construction industry Concrete -- Fatigue Thesis (MEng)--Stellenbosch University, 2023. ENGLISH ABSTRACT: Concrete is globally used for construction and is well known for its high compressive strength, but rather low tensile strength. To mitigate this weakness, the use of fibres to reinforce concrete has gained popularity. The fibres work in the concrete specimens by crack bridging and delaying the growth as well as the widening of cracks in Fibre Reinforced Concrete (FRC). In this study, the static and fatigue behaviour of the Dramix 3D 65/60 BG steel fibres, Dramix 5D 65/60 BG steel fibres and the MasterFibre 240 polypropylene fibres were explored on a mesoscale and macroscale. Single Fibre Pull-out Tests (SFPTs) were carried out to investigate the effect of fibre type and fibre embedment angle on the static and fatigue behaviour of the fibres. The SFPTs were carried out on 40 × 100 × 100 mm3 specimens with fibres embedded at half their lengths and embedded at angles of 0°, 15°, 30°, 50°, and 70°. Flexural three-point tests were carried out to assess the static and fatigue behaviour of FRC at different fibre dosages (Vf). The tests were carried out on 750 × 150 × 150 mm3 beam specimens with 0.5% Vf and 0.8% Vf to assess the effects of fibre type and fibre dosage. The mesoscale testing involved pre-slipping the fibres and exerting a tensile load until failure. The macroscale testing involved pre-cracking the beam specimens and loading until test termination at Crack Mouth Opening Displacement (CMOD) = 3.5 mm. In the fatigue testing, cyclic loads were applied between a maximum (85% of the average static load of the specimen group) and minimum load value (a fixed near zero load value to maintain tensile conditions). These fatigue tests were carried out at a frequency of 6 Hz and were terminated at 2 million cycles or at fibre failure through fibre pull-out or rupture (mesoscale) or CMOD = 3.5 mm (macroscale). Both static mesoscale and macroscale tests revealed that the 5D steel fibres perform best under static loading due to better stiffness and mechanical anchorage. Fibre pull-out was the most common fibre failure type in the static SFPTs, and fibre rupture was dominant in the fatigue SFPTs. An increase in fibre embedment angle led to an increase in fibre resistance due to better mechanical anchorage. The 3D steel fibre performed best in both mesoscale and macroscale fatigue tests due to their tendency to straighten at the hooks instead of rupturing. Compared to the steel fibres, the polypropylene fibres performed the least in both the mesoscale and macroscale tests. An increase in fibre dosage improved FRC performance. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Masters 2023-02-27T11:14:40Z 2023-10-26T13:40:43Z 2023-02-27T11:14:40Z 2023-10-26T13:40:43Z 2023-02 Thesis https://scholar.sun.ac.za/handle/10019.1/128656 en_ZA Stellenbosch University xiv, 126 pages application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Reinforced concrete Materials -- Fatigue Concrete construction industry Concrete -- Fatigue Makara, Nyane Patricia Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title | Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title_full | Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title_fullStr | Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title_full_unstemmed | Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title_short | Static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| title_sort | static and fatigue behaviour of steel and synthetic fibre reinforced concrete |
| topic | Reinforced concrete Materials -- Fatigue Concrete construction industry Concrete -- Fatigue |
| url | https://scholar.sun.ac.za/handle/10019.1/128656 |
| work_keys_str_mv | AT makaranyanepatricia staticandfatiguebehaviourofsteelandsyntheticfibrereinforcedconcrete |