Improving Compressive and Tensile Strength of Slab Sleepers for Railway Bridge by Mechanism of Steel Fiber Reinforced Concrete
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Date
2017-07
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Addis Ababa University
Abstract
Concrete is a material that needs strengthening in tension in order to meet the structural
requirements. New techniques of strengthening concrete, besides the usual ordinary
reinforcement bars, are developing; fiber reinforced concrete is one of them. Fibre
reinforcement is a method that has been in use over the last 30 years, yet it is unfamiliar in our
country Ethiopia.
This research study deals with experimental investigation of C-30 grade concrete with the
addition of 1% ,1.5% and 2% of steel fiber, 4% & 5% glass fiber and deferent percentage mix of
glass steel fibre. For comparison purposes, plain control samples were also considered. This
study was undertaken aiming to investigate the mechanical behavior of concrete reinforced with
the addition of steel fibers, glass fibre and mix of steel glass fibre hoping to improve the
compressive and tensile strength of the plain concrete in order to use on railway bridges slab
track in Ethiopia railway projects to prevent cracks on bridge slab sleepers from the reputedly
application of static and dynamic loads of the train.
The test program was included slump test, compressive strength test, flexural strength test and
toughness tests including load-deflection curve for each mix series. And the results show that,
workability of fresh concrete was largely influenced by the presence of steel fiber and glass
fibre; on the other hand it was unlikely to achieve considerable improvements in compressive
strength by glass fiber inclusion but it was steel fiber indicates good improvement on the
concrete compressive strength up to 26.37% of relative strength grain comparing with the plain
concrete and the flexural tensile strength and the post crack energy absorption were greatly
increased with relative strength gain 66.2% and 273.73% respectively.
However, further, study is still necessary in order to have a more in-depth understanding
of the material interactions and possible practical applications.
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Keywords
Concrete, steel fibers, glass fibre, fiber reinforced concrete, Compressive strength, Flexural strength, Energy absorption