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As per is code 456 2000 if concrete is a design mix then seven days compressive strength should be 70 of the 28 days compressive strength.
7 day compressive strength of concrete formula. Answered february 19 2018 author has 69 answers and 156 6k answer views generally the compressive strength is taken as 1 2 of the 28th day strength for a 3 day concrete cube and 2 3 of the 28th day strength for a 7 day concrete cube. 450kn 450 100 450000n. Here is a typical formula for calculating strength based on time for normal concrete. F cm t β cc t f cm 3 where.
1kn 1000n. However 3 and 7 day test results are not. Its generally taken as a convention rule. Cement type and curing conditions are two factors that affect the amount of strength gain to be expected.
Compressive strength of concrete formula. So seven days compressive strength of concrete shall be 20 n mm2. Concrete is a macro content with sand cement coarse aggregate as its micro ingredient mix ratio and gains its 100 strength over time at the hardened state. The compressive strength of specimen can be calculated by dividing maximum load carried by the specimen by cross sectional area of the specimen cubes.
150 x 150 22500mm 225cm. 3 or 7 day test results are used to monitor early strength gain especially when high early strength concrete is used. Assume the max compression load is 450kn. For example the m 25 grade of cement concrete should have 28 days compressive strength 28n mm2.
The ratio of 28 day to seven day strength lies between 1 3 and 1 7 and generally is less than 1 5 or the seven day strength is normally between 60 to 75 of the 28 day strength and usually above 65. The actual strength depends upon various factors. Why do we test at 7 14 28 days. The surface area of specimen.
F ci f c t 4 00 0 85t if you don t know the f c back into it using the 7 day break value. This concrete strength gain curve can then be used to estimate the long term compressive strength of the concrete from 7 day compressive strength results. Concrete by mindness and young gives a general rule. This paper presents a simple mathematical model to predict the compressive strength of concrete at 28 day from early age say 7 days results.
You have to know the design or expected f c. 4 development of compressive strength with time while design is usually based on the 28 day strength bs en 1992 1 1 sub clause 3 1 2 6 gives an expression for the development of the mean compressive strength of concrete with time at 20 c as follows. According to wikipedia compressive strength of concrete is defined as the characteristic strength of 150mm size concrete cubes tested at 28 days. 7 day compressive strength of concrete formula can also be developed from the concrete strength gain curves where this is deemed more appropriate than a graphical solution.
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