Bedewi, Nasir (2009) Steel Fiber Reinforced Concrete Made with Fibers Extracted from Used Tyres. Masters thesis, Addis Ababa University.
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Abstract
Concrete is considered a brittle material, primarily because of its low tensile strength and low tensile strain capacity. The low tensile strength of concrete is due to internal flaws and microcracks present in the concrete. The use of randomly distributed, discrete fibers to improve the mechanical properties of the matrix is an age-old and intuitive concept. Recently, worldwide researches have been devoted to the use of steel fibers recovered from used tyres in concrete. The concrete obtained by adding these fibers evidenced a satisfactory improvement of the fragile matrix, mostly in terms of toughness and post cracking behavior. As a consequence steel fibers extracted from used tyres appear to be a potential candidate for steel fiber reinforced concrete. To this effect this research work was undertaken aiming to investigate the mechanical behavior of concrete reinforced with steel fibers recovered from used tyres and to quantify the benefits obtained by the concept of SFRC over conventional concrete. For this purpose a bead wire having a diameter of 0.89 mm extracted from burnt used tyres was used and three grades of SFRC namely C-25, C-40 and C-60 were produced incorporating three different volumes of fiber i.e. 0.5%, 1.0%, and 1.5%. Furthermore each volume fraction enclosed three different fiber lengths namely 20mm, 40mm and 60mm. For comparison purposes, plain control samples were also considered. The test program included slump test, compressive strength test, impact resistance test, flexural tensile strength and toughness tests including load-deflection curve, determination of first-crack point, and toughness index. Workability of fresh concrete was largely influenced by the presence of steel fiber; on the other hand it was unlikely to achieve considerable improvements in compressive strength by steel fiber inclusion. Due to the addition of fibers, the flexural tensile strength and the post-crack energy absorption capacity were greatly increased. As far as impact test is concerned both the first crack and ultimate failure strength were enormously improved. The interesting results confirm the promising application of concrete reinforced with steel fibers extracted from used tyres. However, further, research work is still necessary in order to have a more in-depth understanding of the material properties and to evaluate possible practical applications.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Civil Engineering |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TD Environmental technology. Sanitary engineering T Technology > TH Building construction |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 12 Jul 2018 11:25 |
| Last Modified: | 12 Jul 2018 11:25 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7423 |
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