Strength and Flexural Toughness of Concrete Reinforced with Steel-Polypropylene Hybrid Fibers (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.
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.
1 Mechanical Properties Of Hybrid Fibre Reinforced Composite Concrete. (HyFRCC)
2016
Abstract:The concept of hybridization can offer more attractive mechanical engineering properties by adding two or more types of fibre into concrete. For this purpose, type hooked-end deformed steel fibre (SF) with 60mm length and polypropylene fibre (PPF) type fibrillated virgin polypropylene with length 19mm were chosen as a compliment with C30 grade concrete. The specimens incorporated steel and polypropylene fibres in the mix proportions of 100-0%, 75-25%, 50-50%, 25-75 % and 0-100 % with total volume fraction (Vf) 1.5%. The research methodology were focused on experimental program to determine mechanical properties 28 days of hardened concrete HyFRCC such as compressive strength, flexural strength,splitting tensile and flexural toughness. With combination of two fibres in concrete, it will delay micro and macro crack formation with SF was found to enhanced flexural strength, tensile strength, ability to resist cracking and spalling meanwhile PPF will contributed in tensile stra...
Mechanical Properties of Hybrid Fibre Reinforced Concrete With Steel And Synthetic Fibre.
International Journal of Engineering Sciences & Research Technology, 2013
The experimental study deals with Hybrid fibre reinforced concrete with the use of (Polypropylene and Recycled polyethylene terephthalate RPET). The M40 grade concrete used was designed by using IS10262-2009 code. The steel fibre and synthetic fibre were added at the volume fractions up to 0.5%. Test results showed that the fibres, when used in a hybrid form, could result in superior composite performance compared to their individual fibre-reinforced concretes. The results indicate that concrete containing a fibre combination of 0.38% steel fibres & 0.12% PET fibres can be adjudged as the most appropriate combination to be employed in HyFRC for compressive strength, splitting tensile strength and flexural strength. Abstract
2020
This study mainly investigates the flexural performance of reinforced concrete beam (RCC) using polypropylene and steel fibers separately as well as combination of both fibers. Prior to specimen preparation, the physical and mechanical properties of polypropylene and steel fibers were determined. Moreover, the physical properties of binding material, coarse aggregates and fine aggregates were determined. In this research, four categories of beam specimens (4 ́ x 6 ́ ́ x 6 ́ ́size and selected suitable mixing ratio of 1:2:4) were constructed encompassing normal RCC beam (control); addition of 1.5% steel fiber; 2% polypropylene fiber; and combination of 0.5% steel fiber and 1.5% polypropylene fiber in volume of concrete. Experimental results showed that there is considerable increase of flexural strength due to addition of 1.5% steel fiber and 2% polypropylene fiber in concrete. However, the addition of both fibers (hybrid fiber) in combined not only increase the flexural performance ...
When two different fibres are added to concrete to make the composite structure and it gives maximum strength to concrete that type of concrete is hybrid fibre reinforced concrete (HFRC). In this experimental work using of two different fibres they are crimped steel fibre and polypropylene fibre with different mix proportion of hybrid fibres to form the hybrid fibre reinforced concrete. Steel and polypropylene fibres have different properties and these properties will increases the tensile, flexural, impact strength of concrete. Initial cracks, shrinkage can be resist by using of polypropylene fiber and steel fiber is to increases the strength parameters. In present experimental work for M25 grade of concrete can be designed according to IS 10262:2009 with three different proportions of hybrid fibres are added with concrete ingredients. The proportion of steel and polypropylene fibres are added by 50% each with different hybridization ration i.e. 0%,0.5%, 1.0 %, 1.5% .For strength parameters compressive, tensile, flexural, impact strength specimens are casted and cured for 28 days and tested for hardened concrete. For durability study Sorptivity test is carried out to know the absorption of water by capillary. To evaluate the strength parameters different tests are conducted and results are tabulated. From the present work results showed that as the percentage of fibres increases the strength of concrete increases. Hybrid ratio 1.5 % gives maximum results in all the strength parameters compare to other different hybrid ratios.
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.
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.
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
Flexural Properties of Hybrid Fibre Reinforced Concrete -A Comparative Experimental Study
Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented. The most important advantages are hindrance of macro-cracks' development, delay in micro-cracks' propagation to macroscopic level. In this project the flexural properties were studied for concrete prepared using different hybrid fibre combinations of glass fibres and polypropylene fibres. The volume fraction of the glass fibres and polypropylene fibres used in this study are 0.4% and 0.5% of total volume of concrete. The flexural properties were studied using centre point loading method on beam specimens. The objective of this study is to evaluate flexural strength of fibre reinforced concrete with respect to different combination of glass fibres and polypropylene fibres. It is observed that quantity of fibres both glass fibres and polypropylene fibres play significant role in increment flexural properties of concrete.