Abstract
The objective of this research work was to determine the effect of fiber cocktail on mechanical properties of concrete. Three types of fibers were used namely monofilament polypropylene fiber, steel fiber and glass fiber. Steel and glass fiber were incorporated in concrete at different dosages while the content of Polypropylene fiber was kept constant. For this purpose, cubes (150×150×150mm) and prisms (101×101×508mm) were casted for compressive strength test on cubes and Two-Point load test on prisms. Eighteen different mixes were prepared such as control mix, single fiber concrete, double hybrid concrete and triple hybrid concrete. It was observed that both compressive and flexural strength increased with addition of single, double and triple fibers. However, the strengths of triple hybrid concrete were observed to be lesser as compared to single and double hybrid concrete.
Highlights
Combining high modulus fibers like nylon, polypropylene with low modulus fibers like steel, glass etc. gives a good hybrid concrete where high modulus fibers improves the strength of concrete while lower modulus fibers enhances strain performance of concrete
Less reduction in workability on addition of polypropylene fibers may be attributed to the hydrophobic nature of fibers due to which polypropylene fibers do not bond with matrix
While due to the geometry of glass fibers they cause interruption to aggregates to freely creep through the adjoining aggregates
Summary
Most tested fiber combinations are steel-polypropylene [5,6,7,8,9] but other combinations such as steel-glass [10], glass-polypropylene [11]; steel-polyester [12] combinations have been studied. Gives a good hybrid concrete where high modulus fibers improves the strength of concrete while lower modulus fibers enhances strain performance of concrete. S.C Patodi studied effects of adding steel fibers and polyester fibers in concrete. He concluded from results that the concrete with combination of 0.3% Recron and 0.7% steel, yielded 21.91% increase as compared to plain concrete. This combination of Recron and Steel fibers gave much enhanced strength as compared to steel fiber concrete [14]. Combining three types of fibers Steel, polypropylene and PET gave good results. An increase of 7% to 18% in compressive strength was observed as compared to plain concrete [17]
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