MECHANICAL PROPERTIES OF HYBRID FIBER REINFORCED CONCRETE FOR PAVEMENTS (original) (raw)

Investigation on Hybrid Concrete Using Steel and Polypropylene Fiber

 Abstract— The effect of addition of hybrid fibers on the mechanical properties of concrete mixture is studied in the investigation. Steel fibers of 1% and polypropylene fibers 0.035% were added together to from hybrid concrete. Mechanical properties such as compressive strength split tensile test and flexural strength. Hybridization refers to combination of different types of fibers. The purpose of combining the fibers is to improve the multiple properties of concrete mixture. The behavioral efficiency of this composite material is far superior to that of plain and mono fiber reinforced concrete. The addition of fiber is helpful to improve the fracture properties of concrete. The hybrid fibers are comprehensively being used in rigid pavements, airfield pavements, flexible pavements, earthquake-resistant and explosive-resistant structures, mine and tunnel linings, bridge deck overlays, hydraulic structures, rock-slope stabilization, etc.

Effect of Hybrid Fibers on the Mechanical Properties of High Strength Concrete

In this study, high strength concrete of 75 MPa compressive strength was investigated. The experimental program was designed to study the effect of fibers and hybrid fibers (steel and polypropylene fibers) on the fresh (workability and wet density) and hardened properties (compressive strength, splitting strength, flexural strength and dry density) of high strength concrete. Results show that decreases in slump flow of all concrete mixtures containing steel, polypropylene and hybrid fibers compared with control mix (0% fiber). Hybrid high strength concrete with steel and polypropylene fibers showed superior compressive, splitting, flexural strengths over the others concrete without or with single fibers content. The test results indicate that the maximum increase in compressive and flexural strengths are obtains with the hybridization ratio (70%steel + 30% polypropylene) and were equal to 14.54% and 23.34% respectively, compared with the control mix. While, the maximum increase in splitting tensile strength with (100% steel fiber + 0 polypropylene) is 21.19%.

Experimental Study on Concrete Reinforced with Steel-Polypropylene Hybrid Fiber

Reinforcement material is commonly used to provide excellent bonding characteristic, high tensile strength, good thermal capability, toughness and ductility to brittle cementitious matrices. The inclusion of single type fiber may improve the mechanical properties of concrete. But the inclusion of hybrid fiber can compensate the disadvantage of two fiber types and represent their advantage. This paper presents the strength properties of steel-polypropylene fiber reinforced concrete is compared it with hybrid concrete. For this investigation 14 mixes, one plain concrete mix and 13 reinforced concrete mixes were prepared. Two different types of fibers are used in this combination one is crimped steel fiber and another one is polypropylene. Various volume percentages of fibers are added i.e. steel (0.5%,1%,1.5%,2%,2.5%,3%) and polypropylene (0.15%,0.20%,0.25%,0.30%,0.35%,0.40%) obtained optimum values of steel and polypropylene (i.e.2%S & 0.30%P) hybrid mix is prepared. Slump test was carried out for each mix in the fresh state. In the hardened state compression strength test, split tensile strength and flexural strength on steel fiber reinforced concrete, polypropylene concrete and hybrid concrete as well as normal concrete were performed at 7,14,28 days that demonstrates maximum strengths.

Study the Mechanical Properties of Hybrid Fiber Reinforced Concrete

There is increase in fiber use in concrete from last few decades. There is demand of providing cost effective technique with this innovative material while offering improved structural properties. The fibers can be used to replace the conventional bars partially or fully. This paper presents the mechanical properties of Hybrid Fiber Reinforced concrete (Steel and Polypropylene). The combined volume fractions of steel and polypropylene used were 1.25% and 1.75%. The hooked end steel fibers with fibrillated polypropylene were used in this study. The compressive strength and flexural strength of the HyFRC was determined in this study. The concrete of M20 grade concrete was used in this study. The significant improvement in compressive and flexural strength was observed in this study. There improvement in failure strain is observed in this study.

An Investigation on Mechanical Properties of Hybrid Fiber Reinforced Concrete

A composite can be termed as hybrid, if two or more types of fibers are rationally combined in a common matrix to produce a composite that derives benefits from each of the individual fibers. The aim is to study the mechanical properties i.e. split-tensile strength and compressive strength on hybrid effect between steel fiber (SF) and chopped carbon fiber (CF). The test on Hybrid Fiber Reinforced Concrete (HFRC) is to be explored at steel fiber volume fraction 0.5%, 1%, 1.5% and carbon fiber 0.1%, 0.2%, 0.3% by the volume of cement with reinforcement and without reinforcement. For this study, 60 cubes of 150mm, 60 cylinders of 150mm diameter and 300mm height of different combination of SF and CF will be casted of M25 grade of concrete. After testing, effect of different combination and the optimized composition will be concluded. The testing results shows that the optimum of hybrid combination 0.3% CF and 1% SF gives the optimised response in terms of Split-Tensile Strength while hybrid combination of 0.3% CF and 1.5% SF gives the optimised response in terms of Compressive Strength.

Past Investigations on Mechanical and Durability Properties of Hybrid Fiber Reinforced Concrete

IAEME, 2019

In recent years fibers has been widely utilized for strengthening of concrete structures due to its high tensile and flexural properties. In this paper, an introduction is given on the properties of different fibers used for structural applications. Moreover, a brief review of the past investigations on different fibers and the use of metallic, natural and synthetic fibers on improvement in hardened and durability properties of concrete are also highlighted. This paper shall focus on literature review on strength and durability properties of hybrid fibers Steel/polypropylene/glass and carbon fiber reinforced concrete.

An Experimental Study on Effect of Hybrid Fibres in Reinforced Concrete

This project focuses on the experimental investigation carried out on hybrid fibre reinforced concrete (combination of crimped steel fibre and a non-metallic polyester fibre) by varying the steel fibre content(0.1 to 0.25% of volume of concrete) and keeping a constant polyester fibre content(0.20% of weight of cement) which was prepared using normal mixing, compaction and curing conditions. The workability studies and the mechanical properties namely, compressive strength on cubes, splitting tensile strength and modulus of elasticity on cylinders, flexural strength on beams were studied for concrete prepared using 4 different proportions of steel fibre content. It is found that all HyFRC specimens shows better mechanical properties than conventional concrete mix. In our study the maximum strength parameters occurred for 0.15% of steel fibre content with constant polyester fibre content of 0.20%. The failure mode in HyFRC is different from that of conventional concrete mix. The fibres are able to hold the matrix together even after extensive cracking. Fibre addition results in decrease in workability and creates difficulty in compaction which may results in reduction in strength for increased fibre content. Steel fibre helps in bridging action and polyester fibre contributes in delaying the formation of micro cracks.

Utilization of hybrid fibers in different types of concrete and their activity

Journal of the Mechanical Behavior of Materials, 2023

In this work, the influence of using hybrid fibers on the mechanical properties of two types of concrete: high-strength concrete (HSC) and lightweight concrete (LWC) was studied. Using hybrid fibers instead of using only one type reduced the negative effect on concrete mechanical performance. The glass fiber (GF) and polypropylene fiber (PPF) were used in different contents ranged from 0.2 to 1% as weight % of binder content. Moreover, combinations of both fibers "GF + PPF" were used in contents % of "0.3 + 0.5%," "0.5 + 0.5%," "0.3 + 1%," and "0.5 + 1%." LWC mixes were prepared by replacing 40% of the coarse aggregate of reference mix with volcanic material (pumice) as a volumetric replacing. To produce HSC, the water-to-cement ratio was reduced to 0.3, 10% silica fume was added, and 1% super plasticizer was used to obtain the consistency. Compressive strength, splitting strength, and flexural strength tests were carried out. The results showed that using 0.7% GF displayed the highest increases in compressive, splitting tensile, and flexural strength of HSC and LWC mixes. Furthermore, GF exhibited better performance and higher values in compressive, splitting tensile, and flexural strength tests in comparison with PPF. The optimum hybrid fiber content displaying the highest increment of all tested properties in both concrete types, HSC and LWC, was "0.5% GF + 0.5% PPF."

Experimental Investigation on Strength of Hybrid Fiber Reinforced Concrete

International Journal of Scientific Research in Science, Engineering and Technology, 2022

Cementitious substances are really no doubt the most extreme typically applied and basic substances withinside the developing region. From the get-move withinside the reestablishing cycle, those concrete basically based absolutely substances is most likely accurately managed and outlined into the best demonstrated frameworks and fundamental plans. Regardless, the delicacy of those concrete fundamentally based absolutely substances, along their solidified properties, is answerable for the advancement of breaks essentially as their multiplication while revealed to pressures. The mechanical properties of the materials are destroyed by a fundamentally unstable location, necessitating extreme support or perhaps reconstruction of such materials in a normally brief presence hope. New concrete-based materials with improved toughness characteristics, such as break resistance, are thus required inside the improvement area. Standard concrete has replaced fiber-built concrete since it is a delicate material. Although using just one type of fibre might have artistic effects on cement's mechanical properties, hybridization can make up for the absence of other fibre types and adapt to their potential advantages. In this proposal, the effect of using glass fibre and polypropylene fibre to aid concrete is investigated in order to assess the mechanical properties of the significant grid.Therefore, 15 three-dimensional shapes and 15 offices of glass fibre supported concrete (GFRC) with different costs (zero.2 rate, zero.4 rate, zero.6 rate, zero.8 rate, 1.0 rate, 1.2 rate) in degree of M30 grade concrete have been projected inside the wake of reestablishing models having been assessed for best compressive and pressure were given at 1% Three-dimensional squares and chambers are projected with remarkable costs of polypropylene fibre while sparing the glass fibre consistent after participating in best power at the ideal component of glass fibre. This results in approximately the ideal portion of mix fibre built up substantial power of 1% glass and zero.6 rate polypropylene fibre. To determine the flexural strength (70cm X 10cm X 15cm) and shear (100cm X 10cm X 15cm) of half-breed fibre built up concrete, the appropriate piece of fibres is applied (HFRC). The check disclosures demonstrate that, when separated from Ostensible Concrete, the half-breed kind of fibre improves compressive, manageability, flexure, and shear respects.

Influence of Hybrid Polymeric Fibers on Flexural Strength of M30 Grade Concrete

Plain unreinforced Concrete has good compressive strength but it tends to be brittle and is weak in tensile strength. Fiber reinforcement is useful in controlling cracks, enhancing toughness, providing post crack ductility, improving impact resistance and reducing flexural fatigue. Hybrid Fiber Reinforced Concrete (HFRC) is formed from a combination of fibers differing in material properties. The effect of hybridized fibers on flexural strength of M30 grade concrete is investigated in this paper. Control and hybrid fiber composites of three different combinations were cast using varying fiber proportions of steel and Polypropylene Fiber, steel and Glass Fiber and Steel and Nylon Fiber. Flexural strength tests were performed and results were analyzed to associate with above fiber combinations.