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Strength of concrete is tested by destructive testing of concrete test core samples that are taken at the time the concrete is poured. The test cores are about 7" diameter x 16" tall plastic containers. A number of samples are taken. One will be tested at 7 days, another at 28 days. A test report is provided to the firm responsible for paying the bill. The testing method is: place the core sample (removed from the plastic container), in the test machine; the machine will compress the sample until it breaks. A gauge measures the force applied and at what point it breaks.

Concrete usually breaks at 30-40% higher than the minimum specified, because the concrete company has to guarantee the concrete strength. Concrete strength is specified as: 2500 pound, 3000 pound, 4,000 pound, 6000 pound concrete. Sidewalks and non load bearing loads use the lighter weight concrete, bridges and buildings carrying loads will use a higher strength concrete. The strength is adjusted by adding or subtracting the percentages of the raw materials in the mix; limestone, water, sand, and mortar mix.

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