This paper presents regression equations for evaluating the strength and ductility of hybrid fibre reinforced concrete (HFRC). A total of 102 concrete specimens were tested to study the effect of hybrid fibre reinforcement on the strength and ductility of fibre reinforced concrete. The fibre content dosage Vf ranged from 0.0 to 2.0 percent. Steel and Polyolefin fibres were combined in different proportions and their impact on strength and ductility studied. Addition of 2.0 percent by volume of hooked-end steel fibres increases the modulus of rupture, deflection ductility and energy ductility by about 58.78%, 46.0% and 59.0% respectively, when compared to the plain concrete. When the fibres were used in a hybrid form, the increase in above study parameters was about 81.0%, 87.0% and 99.0% respectively, when compared to the plain concrete. Empirical expressions for predicting the strength and ductility of hybrid fibre reinforced concrete (HFRC) are proposed based on regression analysis. A close agreement has been obtained between the predicted and experimental results.
Compressive strength, Ductility, Hybrid fibre reinforced concrete, Modulus of rupture, Polyolefin fibre, Steel fibre, Steel fibre reinforced concrete
