Recently, a basalt FRP-steel composite bar has been developed as a new ductile material to overcome the low elastic modulus and the brittle behavior of basalt FRP bars and corrosion of conventional steel bars especially structures exposed to a harsh environment. In this investigation, forty-five locally manufactured specimens were organized into three types of basalt FRP-steel composite bars with different ratios: (a) Basalt FRP hybridized with steel- wires scattered in the core; (b) Basalt FRP hybridized with plain steel rod as the inner core of hybrid bar; (c) Basalt FRP hybridized with ribbed steel bar in the center of the core, in addition to the control specimens made of pure basalt FRP bars. Uniaxial tensile tests were conducted to predict the stress-strain curve and to determine the elastic modulus, yield strength, ultimate strength, and post-yield stiffness of tested bars. Test results indicated considerable improvement in elastic modulus for basalt-wire hybrid composite bars. However, increasing the steel wire to BFRP ratio up to 36% led to a significant increase in modulus of elasticity by 64% and reduced the ultimate strain by 32.7%.  Also, results showed that after the yield of the inner core of the basalt fiber-steel (plain or ribbed) composite bars and before the fiber fractures the stress-strain curve presented a bilinear behavior coincided with stable post-yield stiffness and remarkable enhancement in ductility was recorded.
 
 
Special Issue of AEIC 2024 (Civil Engineering  Session)