Concrete strength is measured in pounds per square inch, or PSI. Unlike steel or wooden beams that use tensile strength, concrete uses compressive strength, or the ability to carry loads and handle compression downwards. Here are some practical ranges for concrete strength.
Most concrete has a PSI rating somewhere between 2500-3000. Typically, concrete in this range can be used for sidewalks and residential driveways. This is also more affordable than higher strength concrete.
This range of 3500-4000 PSI is typically used for structural purposes. You'll often see this PSI range reserved concrete beams, footings, slab foundations, and high traffic roads.
Concrete in the 4000-5000 PSI range is used in large-scale commercial and industrial projects, such as factories and warehouses.
Concrete with a PSI rating of 6000 or more is considered high-strength concrete. It is typically found in nuclear power plants, high-rise structures, or infrastructural projects such as bridges. High-strength concrete also has a lower water-cement ratio, giving it additional durability and strength.