Optimization Of Flexural Strength And Split Tensile Strength Of Hybrid Polypropylene Steel Fibre Reinforced Concrete (HPSFRC)

Civil Engineering

Replacing costly conventional reinforcement with inexpensive fibres is one of the techniques that can adequately guarantee fast reduction in the cost of concrete production. Sometimes, when two or more fibres are combined and added to concrete in various mixture designs as replacement for conventional reinforcement, then superior reinforced concrete is produced with promising mechanical properties that can control cracking due to plastic shrinkage and to drying shrinkage. This research work is aimed at using Scheffe’s Second Degree Model for six component mixture to optimize the Flexural Strength and Split Tensile Strength of Hybrid – Polypropylene - Steel Fibre Reinforced Concrete (HPSFRC).Using Scheffe’s Simplex method, the Flexural Strength and Split Tensile Strength of HPSFRC were determined for different mix proportions. Control experiments were also carried out and the flexural and split tensile strengths evaluated. The test statistics using the Student’s t-test validated the results. Maximum design strengths recorded for the flexural test at 14 and 28 days were 6.22MPa and 9.84MPa respectively, while those recorded for the splitting tensile test were 4.38MPa and 6.08MPa respectively. HPSFRC controllable design strength values are capable of sustaining construction of light-weight and heavy-weight structures such as Bridges, Airports, maintenance hangars, access roads etc at the best possible economic and safety advantages.

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