1 Mechanical Properties Of Hybrid Fibre Reinforced Composite Concrete. (HyFRCC) 1, 2, a *Wan Amizah Bt Wan Jusoh 1, b , Izni Syahrizal Bin Ibrahim 1 Faculty of Civil Eng, Universiti Teknologi Malaysia (UTM), Malaysia, 81310 Johor Bahru,Malaysia. 2 Faculty of Civil & Env. Eng, Universiti Tun Hussein Onn Malaysia (UTHM), Malaysia, 86400 Parit Raja,Johor, Malaysia. a [email protected]; b [email protected] 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 (V f ) 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 strain capacity, compressive strength and delay micro cracks. The result found that fibre in concrete helps in bridging the crack growth. For (V f ) 1.5%, the fibre mix proportion 75% of ST fibre and 25% of PP fibre which gives highest value of flexural strength, tensile splitting, and 100% of ST fibre and 0% of PP fibre contributed highest value for compressive strength and flexural toughness. Keywords: Hybrid Fibres, Hooked-End, Steel Fibre, Fibrillated, Polypropylene 1.0 Introduction Concrete are the second most consumed construction materials after water with twice as much concrete used across the world rather than all other construction material. Concrete meanwhile in its certain common characteristic is strong in compression and weak in tension (Mindess, 1990). Concrete also associated with creep and drying shrinkage which induced cracking problems and deterioration. Reinforcement of concrete with short randomly distributed fibres can address some of the concerns related to concrete brittleness and poor resistance to crack growth (P.N.Balaguru, 1992). When utilizing with single type of fibre may improve of properties to a limited level. However by hybridization with two or more different type of fibre in concrete will known as hybrid fibre reinforced composite concrete HyFRCC. In a HyFRCC, two or more different types of fibres can be properly combined to produce a composite, whose mechanical and physical performances take benefits from each type of fibres and from a possible synergistic response
Mechanical Properties Of Hybrid Fibre Reinforced Composite Concrete. (HyFRCC)
Jun 05, 2023
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
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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 strain capacity, compressive strength and delay micro cracks. The result found that fibre in concrete helps in bridging the crack growth. For (Vf) 1.5%, the fibre mix proportion 75% of ST fibre and 25% of PP fibre which gives highest value of flexural strength, tensile splitting, and 100% of ST fibre and 0% of PP fibre contributed highest value for compressive strength and flexural toughness.
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