PSI is pound-force per square inch and it is used to determine the strength of a mixture of concrete via compression. The higher the PSI number, the more the concrete can withstand compression, and essentially the stronger it is.

Concrete of different types are used for different purposes in construction, generally, and have different costs and different properties that makes it so the strongest PSI concrete is not appropriate for all construction uses. Concrete with 2,500 PSI is the most general and the lowest strength PSI allowed for use by law in most states. 3,000 PSI concrete is also a very general concrete type that can be used while damp. 4,000 PSI concrete is used for pavement and floors that see heavy traffic. Concrete between 5,000 and 10,000 PSI strength also exist for very special, very select uses and often require specialized engineering to create.

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