Abstract
The low tensile strength and limited ductility, the unavoidable deficiency, of concrete can be overcome by the addition of fibres. High strength concrete (HSC) of 60 MPa containing hybrid fibres, combination of steel and polyolefin fibres, at different volume fraction of 0.5, 1.0, 1.5 and 2.0% were compared in terms of compressive, splitting tensile strength and flexural properties with HSC containing no fibres. Test results showed that the fibres when used in hybrid form could result in enhanced flexural toughness compared to steel fibre reinforced concrete (HSFRC). The compressive strength of the fibre-reinforced concrete reached maximum at 1.5% volume fractions and the splitting tensile strength and modulus of rupture improved with increasing volume fraction. Strength models were established to predict the compressive and splitting tensile strength and modulus of rupture of the fibre-reinforced concrete. The models give prediction matching the measurements.
Highlights
With the development of high grade cement and availability of proper mineral admixtures and chemical admixtures, it has become quite common to adopt concrete with compressive strength of 60 modulus (GPa) Tensile strength (MPa) and above
It has been proved that the comparatively higher compressive strength of High strength concrete (HSC) is an attractive profit from engineering characteristics and economic point of view whereas, the strength behaves against the ductility of concrete by welcoming brittleness pronouncedly[3]
The objective of this research is to determine the basic properties of hybrid fibre reinforced high strength concrete in terms of compressive, splitting tensile and flexural tests in comparison with the plain high-strength counter part and establishes models for predicting the behaviour of HSFRC and HYFRC under compression, splitting tension and flexure
Summary
With the development of high grade cement and availability of proper mineral admixtures and chemical admixtures, it has become quite common to adopt concrete with compressive strength of 60 MPa and above. To improve the ductility of HSC, a strategy is to introduce steel or polymeric fibres in HSC which results in development of near isotropic material with reasonable tensile strength and greater toughness which prevents the initiation and propagation of cracks[4,5,6,7,8] It has been shown recently[9,10,11,12] that by using the concept of hybridization with two different fibres incorporated in a cement matrix, the hybrid composite can offer more attractive engineering properties because the presence of one fibre enables the more efficient utilization of the potential properties of the other fibre. The objective of this research is to determine the basic properties of hybrid fibre reinforced high strength concrete in terms of compressive, splitting tensile and flexural tests in comparison with the plain high-strength counter part and establishes models for predicting the behaviour of HSFRC and HYFRC under compression, splitting tension and flexure
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