Mechanical Properties of Hybrid Fiber Reinforced Concrete

Abstract

Abstract:Fiber reinforcement is commonly used to provide toughness and ductility to brittle cementitious matrices. Reinforcement of concrete with a single type of fiber may improve the desired properties to a limited level. A composite can be termed as hybrid, if two or more types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergetic response. This study aims to characterize and quantify the mechanical properties of hybrid fiber reinforced concrete. For this purpose nine mixes, one plain control mix and eight fiber reinforced mixes were prepared. Six of the mixes were reinforced in a hybrid form. Four different types of fibers were used in combination, two of which were macro steel fibers, and the other two were micro fibers. Volume percentage of fiber inclusion was kept constant at 1.5%. In hybrid reinforced mixes volume percentage of macro fibers was 1.0% whereas the remaining fiber inclusion was composed of micro fibers. 28-day compressive strength, flexural tensile strength, flexural toughness, and impact resistance tests were performed in the hardened state. Various numerical analyses were carried out to quantify the determined mechanical properties and to describe the effects of fiber inclusion on these mechanical properties. It was observed that micro steel fibers contributed to the strength and toughness whereas polypropylene fibers are effective in providing ductility.

The Mechanical Properties and Chloride Resistance of Concrete Reinforced with Hybrid Polypropylene and Basalt Fibres

“…As expected, incorporating fibre significantly improved the splitting tensile strength of concrete, and the augmented percentage of the splitting tensile strength of fibrous mixtures is in the range of 2.67–43.65% in comparison to that of no-fibre concrete. The results are consistent with those analysed previously by other researchers [23,45,46,47]. This can be attributed to the bridge-action of fibres across cracks, which effectively delays and restrains the propagation of microcracks and macrocracks in the splitting tensile test.…”

Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

“…The efficiency of the fiber is dependent upon factors such as the properties of the fiber matrix, volume of fiber inclusion, fiber geometry, type of fiber, and orientation of fiber in the concrete mixture [22,23]. There is a wide range of fibers available to improve toughness and different properties of hardened concrete.…”

Mechanical and Thermal Properties of Hybrid Fibre-Reinforced Concrete Exposed to Recurrent High Temperature and Aviation Oil

“…Researchers in the last few decades saw a sharp rise in the use of different fibres in concrete to increase its mechanical properties such as flexural strength, toughness, tensile strength and durability [ 20 , 21 , 22 , 23 , 24 ]. The fibres’ effectiveness usually depends on fibre, fibres geometry and orientation, volume fraction (V f ) and properties of fibres matrix in the concrete mixture [ 25 , 26 ]. Among the commercially available fibres, steel, carbon and polymer fibres are the most widely used ones [ 27 ].…”