However it would certainly depends upon no of factors such as- type of cement and their grade, cement & sand Mix Ratio, water ratio, gravel ratio, Concrete compactness (Vibrator) etc.Ĭoncrete gain its strength with time after casting. A higher psi means a given concrete mixture is stronger, so it is usually more expensive and lower Psi means a given concrete mixture is on average strength.Ĭompressive Strength of concrete can be estimated by strength of cement attained in 1,3, 7, 14, 21 and 28 days. Using Thumb Rule, value of cube strength is is 1.25 times higher than cylinder strength.Ĥ000 Psi concrete compressive strength at 3, 7, 21 and 28 daysĪs per ACI standard, compressive strength of concrete measured in Psi (Pounds per square inch). Value of cube strength is higher than cylinder strength. Value of cube strength and cylinder strength are different for same mix. And compression test is carried on cylinder shaped concrete block, when tested with 15cm dia and 30cm length of cylinder, that is known as cylinder test and their strength is called cylinder strength. If Compression test is carried on cubic concrete block, when tested with cube size 15cm × 15cm × 15cm, that’s known as Cubic test and their strength is called cubic strength. The compressive strength of 4000 psi concrete is approximately 11 MPa (1600 psi) at 3 days, approximately 18 MPa (2600 psi) at 7 days, approximately 25 MPa (3600 psi) at 14 days, approximately 26.5 MPa (3840 psi) at 21 days and approximately 4000 psi at 28 days when tested with 15cm dia and 30cm length of cylinder of cylinder test.Ĭharacteristic strength of concrete is their compressive strength which can be determined by axial compression test on cubic concrete block or cylinder shape.
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