Experimental Study on Concrete Reinforced with Steel-Polypropylene Hybrid Fiber (original) (raw)
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Behavior of Steel-Polypropylene Hybrid Fiber Reinforced Concrete
2014
Since ancient time, fiber reinforced concrete has been replaced with plain concrete which is brittle material. Although, the inclusion of single type fiber may improve mechanical properties of concrete, the hybridization can compensate the disadvantages of two fiber types and represent their advantages. This thesis explores the effect of using steel fiber and polypropylene fiber for reinforcing the concrete to quantify the mechanical properties of concrete matrix. For this purpose, 45 specimens of fiber reinforced concrete which contains different fibers dosage were casted. All mixes were tested for slump and VeBe test in fresh state, and 28 days compressive strength, flexural strength and impact resistance tests were carried out in hardened state. According to the test results, the regression analysis was carried out to predict the value of compressive strength, flexural strength and impact resistance. The experimental results show that the hybrid form of fiber has slight effect on compressive values, while it causes increase in modulus of rupture, toughness and impact resistance values.
Strength and Flexural Toughness of Concrete Reinforced with Steel-Polypropylene Hybrid Fibers
Results of an investigation conducted to evaluate the strength and flexure toughness of Hybrid Fibre Reinforced Concrete (HyFRC) containing different combinations of steel and polypropylene fibres are presented. An experimental programme was planned in which beam specimens of size 100 x 100 x 500 mm were tested under four point static flexural loading to obtain the flexural strength of HyFRC. In addition, cube specimens of size 150 x 150 x 150 mm were also tested to obtain its compressive strength. The specimens incorporated steel and polypropylene fibres in the mix proportions of 100-0%, 75-25%, 50-50%, 25-75% and 0-100% by volume at a total volume fraction of 1.0%. The flexural toughness parameters were obtained using procedure laid down in ASTM C-1018 C, JCI Method, ASTM 1609/C 1609 M and Post Crack Strength (PCS) Method. The results indicate that concrete containing a fibre combination of 75% steel fibres + 25% polypropylene fibres can be adjudged as the most appropriate combination to be employed in HyFRC for compressive strength, flexural strength and flexural toughness.
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.
Durability properties of concrete reinforced with steel-polypropylene hybrid fibers
Science and Engineering of Composite Materials, 2012
In this study, some mechanical and durability properties of concrete specimens, with a water/cement (w/c) ratio of 0.47 and having a reference slump of 40 mm, produced by addition of steel fi bers (SF) and/or polypropylene fi bers (PF), were investigated. The additions of SF were 20 kg/m 3 and 40 kg/m 3 and PF additions were 0.3 kg/m 3 and 0.6 kg/m 3. Workability and unit weight tests were made on fresh concretes. Compressive stress, elastic modulus, and fl exural tensile tests were performed on hardened concretes. Also, load-defl ection curves and toughness indices were obtained during a three-point fl exure tensile test. Freeze-thaw, abrasion and drying shrinkage tests were also carried out to determine the effects of SF and/or PF on some durability properties of concretes. It was observed that fi ber inclusion to concrete decreases the workability and that the mechanical properties of concrete can be improved by the addition of fi bers. Using hybrid fi bers in the concrete both increases and decreases some mechanical properties of concrete. In order to see a greater effect of both SF and PF on the properties of concrete, different hybrid fi ber volume fractions for different matrix strengths may be examined, since fi ber type and fi ber volume fractions are important parameters to be taken into account in the mix design of concrete for the performance
This experimental work describes the mechanical properties of Hybrid Fibre Reinforced concrete(HFRC).HFRC is prepared by adding any two fibres to the conventional concrete to make it a composite mixture and that derives benefits from each of the added fibre and exhibits significant response. The fibres which are used in the present experimental work is steel fibres and polypropylene fibres. Here the polypropylene fibres helps in resists initial cracks and shrinkage ,steel fibres helps in increase the strength of concrete. In present work M 30 grade of concrete can be prepared according to the IS 10262:2009 reference code. these steel and polypropylene fibres are added by 50% each with different hybridization from 0% to 1.5%.For calculating strength parameters specimens are casted and cured for 28 days and tested in the lab for Compressive Test, Tensile Test, Flexural test. From the present investigation the strength parameter increases with the percentage of increase in fibre. Therefore here the hybrid ratio of 1.5% gives the more result when compared to other hybrid ratio.
Properties of steel-polypropilene hybrid fibers reinforced concrete
Facta universitatis - series: Architecture and Civil Engineering, 2021
This paper present the results of mechanical properties of hybrid reinforced concrete made by adding polypropylene and steel fibers into concrete mixture. For the testing purposes were used steel fibers with hooked ends and monofilament polypropylene fibers. The total of 5 batches of concrete were made: concrete with addition of steel fibers, polypropylene fibers and their combination in amount of 0,5 % of the concrete volume. The test results show that concretes made by adding of 0.4% steel and 0.1% polypropylene fibers have better performance compared to other concretes.
From industrial point of view, recently a great attention has been paid to the use of additives such as steel and polypropylene fibers in concrete and cement products. Investigations have revealed that the addition of steel and polypropylene fibers into normal concrete impart significant improvement in controlling its surface cracking, increase their tensile and flexural strength and durability. Considering the advantages of these additives, high strength concrete samples were produced with different mix design as well as using cement replacement materials such as silica fume according to a well-established experimental set up. The tests show that mixed use of steel and polypropylene fibers give good results in terms of improving structural characteristics of the concrete material developed. In all samples, the surface cracking was decreased significantly by adding suitable fibers in terms of sort, diameter, and length. However, the use of 1 kg polypropylene and 78 kg steel fibers in 1 cubic meter concrete was proposed as optimum mix design, regarding the improvement of compressive, tensile and flexural strength of concrete as well as scientific and practical points of view. So that, these newly developed structural concrete reveals promising potentials for further research and development as well as an structurally important building block material.
Development of hybrid polypropylene-steel fibre-reinforced concrete
Cement and Concrete Research, 2000
This research first investigates the optimization of fibre size, fibre content, and fly ash content in hybrid polypropylene-steel fibre concrete with low fibre content based on general mechanical properties. The research results show that a certain content of fine particles such as fly ash is necessary to evenly disperse fibres. The different sizes of steel fibres contributed to different mechanical properties, at least to a different degree. Additions of a small fibre type had a significant influence on the compressive strength, but the splitting tensile strength was only slightly affected. A large fibre type gave rise to opposite mechanical effects, which were further fortified by optimization of the aspect ratio. There is a synergy effect in the hybrid fibres system. The fracture properties and the dynamic properties will be further investigated for the hybrid fibres concrete with good general mechanical properties.
FLEXURAL CHARACTERISTICS OF REINFORCED CONCRETE WITH CRIMPED STEEL FIBER AND POLYPROPYLENE
IRJET, 2022
In this study, Secondary sector plays an important role in our country. Our construction technique sometimes results in failure such as collapse. To Overcome this failures, we are going to study the addition of polypropylene fiber and crimped steel fiber in the concrete. This will increase the flexural, shear performance and brittleness of the building even in the poor soil packing site. This study also improves the strength of reinforced concrete by providing the combination of polypropylene and crimped steel fiber. This project work polypropylene fiber and crimped steel fiber different percentage (0.4%, 0.8%, 1.2%) are added in the concrete and using M30. Tests on the concrete compressive strength, split tensile strength, flexural resistance.
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.