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Concrete mix with the following minimum specification is usually required: • 28 day compressive strength – 3000 psi (20 MPA) • 28 day compressive strength – 3500 psi (25 MPA) for freeze-thaw conditions • Maximum aggregate size: 3/8″ (10 mm) • 4 ½” (115 mm) slump at point of discharge For more information click here
