Experimental Determination Of Compressive, Split Tensile And Flexural Strength Of HFRC Using Steel And Polypropylene Fibres In Different Proportions (original) (raw)
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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.
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.
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.
2018
The addition of fibres into the brittle concrete shall imparts tensile nature. The addition of two or more fibres in the concrete named as Hybrid Fibre Reinforced Concrete(HFRC) which derives more benefits from each of the individual fibres than the Single Fibre Reinforced Concrete (SFRC). The present experimental investigation focus on the properties of HFRC using various percentages of Polypropylene and steel fibres for M20 grade of concrete. To control the propagation of micro crack to macro crack, polypropylene fibres of Recron 3s (PPF-0.1%, 0.2%, 0.3%, 0.4%) have used, while the double hooked end steel fibres (SF-0.5%, 1.0%, 1.5% and 2%) are used to impart the tensile nature in the concrete. The objective of the study is to observe the transformation of concrete from brittle to ductile and to find the optimum performance of fibres in HFRC. The stress strain behavior of Hybrid Fibre Reinforced Concrete is studied by comparing with individual fibre incorporation.The study conclude that the hybridization of metallic and non-metallic fibres has the ability to arrest the propagation of micro and macro cracks in the cement matrix of the concrete with increased extensibility and tensile nature.
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.
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.
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.