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| dc.contributor.author | Aragaw, Esmael | |
| dc.date.accessioned | 2020-11-25T08:09:56Z | |
| dc.date.available | 2020-11-25T08:09:56Z | |
| dc.date.issued | 2020 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/11666 | |
| dc.description.abstract | Steel fiber for application in concrete structural and nonstructural members studied more than 50 years. Despite its renowned improving effect in controlling microcracks and ductility that is at large dependent on its post cracking residual strength and toughness, application in construction works yet not as expected. The reason for such discrepancy is the lack of in-depth experimental research, which in turn lacks provision in design code and experimental procedures. Meanwhile, research emerges with the idea of using wasted tyre as a replacement of industrial steel fiber in an objective both to improve the concrete behavior and sustain the huge environmental waste extracted from the tyre. As a result, despite its limitation in addressing essential areas, recycled steel fiber that is extracted from waste tyre shows comparable improvement as that of the usual steel fibers in concrete members. This thesis work, therefore, tries to shed some light on the aspect of improvements and applicability of recycled steel fiber in plain and or conventionally reinforced concrete members that are exposed to twisting action. Besides of identifying the failure patterns and overall behaviors that it avails in concrete, it is also the major purpose of the thesis work to sustain the environment from the huge burden of wasted tyres that is prohibited from landfill disposal because of its nondegradable nature, by making it as an alternative construction material. With this intent in mind, a torsional test setup was prepared for a total of 28 beams from which 14 beams are plain concrete and another 14 for conventionally reinforced concrete beams with recycled steel fibers including control plain and reinforced beams for comparison purposes. The recycled steel fibers were produced from a controlled burning process of collected ousted waste tyres with a length of 25 mm and 50 mm having a 0.87 mm diameter. To identify the effect of the volume fraction of the fiber, three volume fractions namely 0.5%, 1.0%, and 1.5% were prepared. Concrete grade C-25/30 were selected and mix proportioning was also made. Sufficient characterization of its ingredient according to standards that include the recycled steel fiber was done. The test revealed that up to 131.43% and 45.33% improvement in the ductility and torsional strength respectively for the fiber length of 50 mm and a volumetric percentage of 1.5% in the reinforced concrete samples when compared to the control samples. In addition, a multi cracking behavior attributed to the crack arresting performance of recycled steel fiber was also observed for plain and reinforced samples. The result is significant for the applicability of steel fiber as an alternative construction material in any concrete construction works where torsional stress is predominant. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Structural Engineering | en_US |
| dc.title | RECYCLED STEEL FIBERS IN CONCRETE BEAM UNDER TORSION | en_US |
| dc.type | Thesis | en_US |
