Concrete strength refers to the ability of concrete to withstand loads without failing. It is typically measured in terms of compressive strength, which is the maximum amount of pressure the concrete can endure before breaking. This strength is influenced by factors such as the mix design, the quality of materials used, and the curing process. The compressive strength of concrete is usually expressed in pounds per square inch (psi) or megapascals (MPa). Standard concrete mixes can achieve strengths ranging from 2,500 psi to 5,000 psi, while high-strength concrete can exceed 10,000 psi. Proper testing methods, such as the slump test and cylinder test, are essential for determining concrete strength.