A pressure measurement most commonly used to specify how strong concrete is.
Pounds per square inch (PSI) is a unit of pressure or stress measurement equal to one pound-force applied over an area of one square inch. In construction, PSI is used to specify the compressive strength of concrete (e.g., 3,000 PSI, 4,000 PSI, 6,000 PSI), as well as the pressure rating of hydraulic systems, pneumatic tools, grouting operations, and water pressure systems. Concrete PSI requirements are established by the structural engineer based on the member's design loads.
The structural drawings specify 5,000 PSI concrete for the parking garage columns to support the increased load requirements.
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