Performance optimization of hybrid fiber concrete according to mechanical properties

Abstract

In this research, interactional effects of four different fiber types, (steel, glass, synthetic and polypropylene) fly ash replacement ratio with cement, electrical arc furnace slag replacement ratio with natural aggregate and binder dosage on the mechanical properties (flexural and compressive strength, pull out capacity, resonance frequency and abrasion resistance) of Hybrid Fiber Concretes were investigated. The HFC samples were exposed to temperatures of 250 °C, 500 °C and 750 °C. The changes in the HFC samples after exposed to elevated temperature were determined by measuring the compressive strength and resonance frequency. 30 different experimental programs were conducted by using the central composite design method. By using experimental test results analysis of variance was performed and regression models obtained. The optimal combination was proposed by optimizing dependent variables and maximization of flexural and compressive strength, pull out capacity and resonance frequency while minimization of abrasion resistance.