Use of short fibres in structural concrete to enhance mechanical properties

Wong, Chuan Mein (2004) Use of short fibres in structural concrete to enhance mechanical properties. [USQ Project]

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Abstract

The purpose of this research is based on the investigation of the use of short fibres in
structural concrete to enhance the mechanical properties of concrete. The objective of
the study was to determine and compare the differences in properties of concrete
containing no fibres and concrete with fibres, as well as the comparison on the effects
of different type and geometry of fibres to the concrete. This investigation was carried
out using several tests, which included workability test, compressive test, indirect
tensile test, flexural test and modulus of elasticity test.
A total of ten mix batches of concrete containing 0%, 0.5%, 1.0% and 1.5% fibre
volume dosage rate on 'wave cut' steel fibres, high performance polypropylene fibres
and Fibremesh were tested to determine the enhancement of mechanical properties of
concrete. The workability of concrete significantly reduced as the fibre dosage rate
increases. This was assessed through standard slump test, compacting factor test and
VEBE consistometer test. Results of compressive strength test indicated that the use
of fibre in concrete might not efficiently increase in strength. In flexural and indirect
tensile test showed specimens with fibres that drastic increase in strength from
specimens without fibres. A moderate increase in modulus of elasticity of the fibre
reinforced concrete was indicated in modulus of elasticity test. The usage of fibres
were fully utilised when it comes to post-cracking stage, as it increase on ductility and
toughness of concrete. This was examined through the load/deformation curve of
flexural strength test and stress/strain diagram of modulus of elasticity test.
It was found that different type and geometry of fibres influence the mechanical
properties of concrete in a different manner. As to create a cost efficient fibre
reinforced structure, these changes on fibres are vital to the design and construction.
However, further investigations were highly recommended and should be carried out
to understand more mechanical properties of fibre reinforced concrete.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 00:14
Last Modified: 02 Jul 2013 22:30
Uncontrolled Keywords: short fibres, structural concrete, workability test, compressive test, indirect tensile test, flexural test and modulus of elasticity test, polypropylene fibres, fibremesh, fibre mesh, slump test, compacting factor test, VEBE consistometer test
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
URI: http://eprints.usq.edu.au/id/eprint/95

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