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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 75
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar
Paper 123
Mechanical Properties of Fibre-Reinforced High Strength Concrete M.B.H. Emara, S.F.M. Abd Elnaby, H. Amin and M.A. El-Demirdash
Department of Civil Engineering, Faculty of Engineering –- Mataria, Helwan University, Cairo, Egypt Full Bibliographic Reference for this paper
M.B.H. Emara, S.F.M. Abd Elnaby, H. Amin, M.A. El-Demirdash, "Mechanical Properties of Fibre-Reinforced High Strength Concrete", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 123, 2002. doi:10.4203/ccp.75.123
Keywords: polypropylene fibres, fibre-reinforced concrete, fibrous concrete, high strength concrete, constitutive models, material properties.
Summary
The increased use of high strength concrete in recent years has increased the
demand to enhance its ductility under compressive loads. The explosive nature of
the failure of this type of concrete under compressive stresses leaves little warning if
any, prior to failure. In addition, high strength concrete is characterised by having
low ductility under compressive loads. Another disadvantage is manifested by its
brittle fracture mechanisms in tension and especially when subjected to large
diagonal tensile strains under high shearing forces.
It thus became a requirement to try to enhance the behaviour by introducing fibres into this type of concrete. The most common type of fibre used by researchers is the steel fibre. Another type of fibre that is commonly available is the polypropylene fibre. This latter type is characterised by being relatively inexpensive in price and light in weight (low specific weight) when compared to other types of fibres.
For these reasons, an experimental programme has been conducted to investigate
the effects of introducing polypropylene fibres into higher strength concrete
applications. Four different fibre volume fractions were used in the study namely 0,
0.5, 1.0 and 1.5%. Three types of concrete grades were cast. Typical cylinder
compressive strengths
The study revealed that polypropylene fibres significantly enhanced the tensile
properties of higher strength concretes, increased the ductility under compressive
loads, reduced transverse deformations however reduced the peak attainable strength
under compressive loads. A two parameter model for calculating the tensile strength
of concrete as a function of both the concrete grade, as expressed by the cylinder
peak strength
The model given by equation (123.1), shows excellent agreement with the experimental results and represents a solid foundation for the future development of a group of constitutive models that can be used to quantify the behaviour of high strength concretes reinforced with polypropylene fibres. purchase the full-text of this paper (price £20)
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