Relation between Strength Properties (Flexural and Compressive) and Abrasion Resistance of Fiber (Steel and Polypropylene)-Reinforced Fly Ash Concrete

In this experimental study, the influence of using fly ash, polypropylene fiber, and steel fiber in concrete on abrasion resistance is presented. Seven concrete mixtures containing 0, 10, 15, 20, 25, 30, and 45% fly ash as cement replacement in mass basis were prepared. Another, seven fiber-reinforced portland cement concrete mixtures containing 0.25, 0.5, 1, and 1.5% steel fiber, and 0.05, 0.1, and 0.2% polypropylene fiber in volume basis were prepared. These seven fiber-reinforced Portland cement concrete mixtures were modified by replacing 15 and 30% fly ash with cement in mass basis, consequently, 14 fiber-reinforced fly ash concrete mixtures were prepared. Water-binder ratio was kept constant at 0.35 for all concrete mixtures. Bohme surface abrasions of the concrete mixtures were measured at $28\text{days}$ . The results of the laboratory work showed that replacement of fly ash with cement reduced abrasion resistance of concrete; however, inclusion of the steel fiber improved the abrasion resistance of concrete. Using polypropylene fiber did not improve abrasion resistance of concrete made with or without fly ash. The comparison between the relation of abrasion to compressive strength and abrasion to flexural tensile strength, made in terms of $R^2$ of the linear regression on log scale, showed that a stronger relation existed between abrasion and flexural tensile strength than between abrasion and compressive strength of the concrete containing either fly ash or fibers, or both.