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Abstract
A comprehensive program of experiments consisting of compression, uniaxial compression, direct shear, flexural as well as splitting tensile and air permeability tests were performed to analyse the effect of the level of fibre dosage and the water–cement ratio on the physical properties of hybrid fibre-reinforced concrete (HFRC). Two types of fibres were studied in terms of their effect on the properties of HFRC. The results indicated that the mechanical properties of concrete were significantly improved by increasing the fibre content. However, increasing the percentage fibre content past a certain peak performance limit (0.9% glass fibre (GF) and 0.45% polypropylene fibre (PPF)) led to a decrease in strength compared to reference mixes. Additionally, the incorporation of hybrid fibres yielded an increase in air permeability in the tested specimens. The results showed that the strength-related properties of HFRC were superior to the properties of single fibre-reinforced concrete.
Highlights
Unreinforced concrete is brittle in nature, and is characterized by low tensile strength but high compressive strength
The aim of this study was to create an improved model of the relationship between fibres and permeability
Ordinary Portland cement, fly ash, silica fume and mineral powder were used in accordance with
Summary
Unreinforced concrete is brittle in nature, and is characterized by low tensile strength but high compressive strength. Because of this property and a lack of bonding in the concrete matrix at the transition zone, the brittleness increases along with increasing concrete strength. Combining fibres with concrete can produce a range of materials which possess enhanced tensile strength, elasticity, toughness, and durability. This is accomplished by limiting or controlling the start, spread, or spread persistence of cracks [3,4,5,6,7]. Several types of fibre are available—the predominant types are natural, synthetic, steel, carbon and glass [8,9,10,11,12,13]
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