Optimization Of Compressive Strength Of Hybrid Polypropylene – Nylon Fibre Reinforced Concrete (HPNFRC)

Civil Engineering

It is an established fact that reinforcement of concrete with a single type of fiber may likely improve the desired properties to a limited level. In other to overcome this shortcoming, a composite fibre , otherwise referred as as hybrid ( for two or more types of fibers) are rationally combined to produce a composite that derives benefits from each of the individual fibers and also exhibits a synergetic response, such as increase in the compressive strength of the new composite. Thus this research work is focused at using Scheffe’s Second Degree Polynomial Model for six component mixtures, Scheffe’s (6,2) to optimize the compressive strength of Hybrid – Polypropylene – Nylon Fibre Reinforced Concrete (HPNFRC).Using , Scheffe’s (6,2) simplex model introduced by Nwachukwu and others (2022g) , the compressive strengths of HPNFRC were obtained for different mix proportions/ratio. The mix proportion of Polypropylene – Nylon was in 50% - 50% ratio. Control experiments were also carried out, leading to the evaluation of the compressive strengths at the experimental control points. Through the use of the Student’s t-test statistics, the adequacy of the model was validated .The optimum (maximum) compressive strength of HPNFRC was 60.05 MPa . This maximum value is higher than the minimum value specified by the American Concrete Institute (ACI), as 20 MPa as well as the minimum value specified by ASTM C 469, as 30.75 for good concrete. Thus, the HPSFRC compressive strength value can sustain construction of ground –level application and basement foundation as well as supporting both commercial and industrial construction works as high performance concrete at the best possible economic, aesthetic and safety advantages.

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