What type of rebar has the highest tensile strength?

Reinforcing bars (rebar) are classified by grades that indicate their yield strength, which is essential for understanding their tensile strength. The higher the grade, the greater the tensile strength of the rebar. In the case of Grade 80 rebar, it has a yield strength of 80,000 psi, which makes it suitable for applications requiring high strength and ductility.

Grade 60, while commonly used, provides a lower yield strength of 60,000 psi, making it less suitable for high-stress applications compared to Grade 80. Grade 75 has a yield strength of 75,000 psi, still lower than Grade 80. Grade 90 offers greater strength compared to the others; however, it's less common and not standard as Grade 80.

Choosing Grade 80 ensures the highest tensile strength in this context, as it represents the best balance of strength and ductility in conventional grade classifications for rebar.