EFFECT OF TYPE OF FIBER ON THE MECHANICAL PROPERTIES OF HIGH STRENGTH CONCRETE (HSC) | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 5, Volume 39, No 3, May and June 2011, Page 539-547 PDF (93.95 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2011.127582 | ||||
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| Author | ||||
| R. A. S. Mohamed | ||||
| Associate Professor, Civil Engineering Dept., Faculty of Engineering, El-Minia, Egypt. | ||||
| Abstract | ||||
| High strength concrete (HSC) has been widely applied worldwide, in recent years, due to its favorable strength and dense microstructures. HSC shows some characteristic and engineering properties different from those of normal strength concrete even they utilize similar raw materials. Great use of the HSC is found in application where durability is important as high way bridge decks, parking structures, industrial, facilities and off-shore structures special structure such as high rise building and bridges with very long span would not have been possible without the development of HSC. However, the applications of HSC are still hindered by its relative brittleness or lack of ductility such a drawback can be overcome by the addition of discontinuous fibers. The present work investigates the effect of addition of two types of fibers with different ratios; pure polypropylene and steel fibers to high strength concrete in order to diminish some poor performances particularly in case of tensile strength. The effect of the addition of the two types of fibers on the mechanical properties of HSC is studied. The polypropylene fibers and the steel fibers were added at concentration of 0.0, 0.25, 0.5 and 1.0% by volume. Compression and bending tests were carried out to determine the mechanical properties such as maximum compressive strength, modulus of elasticity, splitting strength and modulus of rupture. On the basis of the experimental results, it can be concluded that, addition of fibers either steel or polypropylene to HSC mixes slightly increases the modulus of rapture 0.5% of polypropylene improves the modulus of rapture by 10% while the same value of steel fibers increases it by 15%. Meanwhile, the polypropylene fibers have no influence in the value of the calculated modulus of elasticity. However, steel fibers increases the modulus of elasticity by about 28%. | ||||
| Keywords | ||||
| HSC; compressive strength; polypropylene and steel fibers; modulus of elasticity | ||||
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