28-Day Concrete Compressive Strength Calculator

✖The 7 Day Compressive Strength achieved by concrete at 7 days is about 65% and at 14 days is about 90% of the target strength.ⓘ 7 Day Compressive Strength [S₇]

+10%

-10%

✖28 Day Compressive Strength of Concrete is defined as the strength of the concrete after 28 days of using it.ⓘ 28-Day Concrete Compressive Strength [f_c]

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Formula

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28-Day Concrete Compressive Strength

Formula

`"f"_{"c"} = "S"_{"7"}+(30*sqrt("S"_{"7"}))`

Example

`"6.8E^-5MPa"="4.5MPa"+(30*sqrt("4.5MPa"))`

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28-Day Concrete Compressive Strength Solution

STEP 0: Pre-Calculation Summary

Formula Used

28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength))
f_c = S₇+(30*sqrt(S₇))
This formula uses 1 Functions, 2 Variables

Functions Used

sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)

Variables Used

28 Day Compressive Strength of Concrete - (Measured in Pascal) - 28 Day Compressive Strength of Concrete is defined as the strength of the concrete after 28 days of using it.
7 Day Compressive Strength - (Measured in Megapascal) - The 7 Day Compressive Strength achieved by concrete at 7 days is about 65% and at 14 days is about 90% of the target strength.

STEP 1: Convert Input(s) to Base Unit

7 Day Compressive Strength: 4.5 Megapascal --> 4.5 Megapascal No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_c = S₇+(30*sqrt(S₇)) --> 4.5+(30*sqrt(4.5))

Evaluating ... ...

f_c = 68.1396103067893

STEP 3: Convert Result to Output's Unit

68.1396103067893 Pascal -->6.81396103067893E-05 Megapascal (Check conversion here)

FINAL ANSWER

6.81396103067893E-05 ≈ 6.8E-5 Megapascal <-- 28 Day Compressive Strength of Concrete

(Calculation completed in 00.004 seconds)

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Created by Ishita Goyal

Meerut Institute of Engineering and Technology (MIET), Meerut

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NSS College of Engineering (NSSCE), Palakkad

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< 19 Compression Calculators

Volumetric Strain given Change in Length, Breadth and Width

Go Volumetric Strain = Change in Length/Length of Section+Change in Breadth/Breadth of Bar+Change in Depth/Depth of Bar

28-Day Concrete Compressive Strength

Go 28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength))

Volumetric Strain given Change in Length

Go Volumetric Strain = (Change in Length/Length of Section)*(1-2*Poisson's Ratio)

Volumetric Strain using Young's Modulus and Poisson's Ratio

Go Volumetric Strain = (3*Tensile Stress*(1-2*Poisson's Ratio))/Young's Modulus

Poisson's Ratio using Bulk Modulus and Young's Modulus

Go Poisson's Ratio = (3*Bulk Modulus-Young's Modulus)/(6*Bulk Modulus)

Poisson's Ratio given Volumetric Strain and Longitudinal Strain

Go Poisson's Ratio = 1/2*(1-Volumetric Strain/Longitudinal Strain)

Longitudinal Strain given Volumetric Strain and Poisson's Ratio

Go Longitudinal Strain = Volumetric Strain/(1-2*Poisson's Ratio)

Volumetric Strain of Cylindrical Rod using Poisson's Ratio

Go Volumetric Strain = Longitudinal Strain*(1-2*Poisson's Ratio)

Lateral Strain given Volumetric and Longitudinal Strain

Go Lateral Strain = -(Longitudinal Strain-Volumetric Strain)/2

Longitudinal Strain given Volumetric and Lateral Strain

Go Longitudinal Strain = Volumetric Strain-(2*Lateral Strain)

Volumetric Strain of Cylindrical Rod

Go Volumetric Strain = Longitudinal Strain-2*(Lateral Strain)

Volumetric Strain given Longitudinal and Lateral Strain

Go Volumetric Strain = Longitudinal Strain+2*Lateral Strain

Bulk Modulus using Young's Modulus

Go Bulk Modulus = Young's Modulus/(3*(1-2*Poisson's Ratio))

Modulus of Rupture of Concrete

Go Modulus of Rupture of Concrete = 7.5*((Characteristic Compressive Strength)^(1/2))

Direct Stress for given Bulk Modulus and Volumetric Strain

Go Direct Stress = Bulk Modulus*Volumetric Strain

Volumetric Strain given Bulk Modulus

Go Volumetric Strain = Direct Stress/Bulk Modulus

Bulk Modulus given Direct Stress

Go Bulk Modulus = Direct Stress/Volumetric Strain

28-Day Concrete Compressive Strength given Water Cement Ratio

Go 28 Day Compressive Strength of Concrete = (2700*Water Cement Ratio)-760

Water Cement Ratio given 28-Day Concrete Compressive Strength

Go Water Cement Ratio = (28 Day Compressive Strength of Concrete+760)/2700

28-Day Concrete Compressive Strength Formula

28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength))
f_c = S₇+(30*sqrt(S₇))

What is Compressive Strength?

Compressive strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall.

How to Calculate 28-Day Concrete Compressive Strength?

28-Day Concrete Compressive Strength calculator uses 28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength)) to calculate the 28 Day Compressive Strength of Concrete, The 28-Day Concrete Compressive Strength formula is defined as the characteristic compressive strength of 150mm size cubes tested at 28 days as per the Indian standards. 28 Day Compressive Strength of Concrete is denoted by f_c symbol.

How to calculate 28-Day Concrete Compressive Strength using this online calculator? To use this online calculator for 28-Day Concrete Compressive Strength, enter 7 Day Compressive Strength (S₇) and hit the calculate button. Here is how the 28-Day Concrete Compressive Strength calculation can be explained with given input values -> 6.8E-11 = 4500000+(30*sqrt(4500000)).

FAQ

What is 28-Day Concrete Compressive Strength?

The 28-Day Concrete Compressive Strength formula is defined as the characteristic compressive strength of 150mm size cubes tested at 28 days as per the Indian standards and is represented as f_c = S₇+(30*sqrt(S₇)) or 28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength)). The 7 Day Compressive Strength achieved by concrete at 7 days is about 65% and at 14 days is about 90% of the target strength.

How to calculate 28-Day Concrete Compressive Strength?

The 28-Day Concrete Compressive Strength formula is defined as the characteristic compressive strength of 150mm size cubes tested at 28 days as per the Indian standards is calculated using 28 Day Compressive Strength of Concrete = 7 Day Compressive Strength+(30*sqrt(7 Day Compressive Strength)). To calculate 28-Day Concrete Compressive Strength, you need 7 Day Compressive Strength (S₇). With our tool, you need to enter the respective value for 7 Day Compressive Strength and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate 28 Day Compressive Strength of Concrete?

In this formula, 28 Day Compressive Strength of Concrete uses 7 Day Compressive Strength. We can use 1 other way(s) to calculate the same, which is/are as follows -

28 Day Compressive Strength of Concrete = (2700*Water Cement Ratio)-760

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