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The 28-Day Myth - National Precast Concrete Association
Oct 28, 2013 . Specified concrete compressive strength is the minimum . minimum design compressive strength, the greater the cost of the concrete. . Cylinders, measuring 12 in. high by 6 in. in diameter, or 8 in. by 4 in., are .. It is likely that you could predict and track results that would range as low as 5 mpa (725 psi),.