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The ratio of compressive strength to tensile strength of concrete is about:

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Concrete is brittle in tension but relatively tough in compression. Tensile strength is almost 1/10th of compressive strength or

Tensile strength of concrete = 10 to 15% of compressive strength. $

As per IS:456 - 2000, section - 6.2.2,

The tensile strength of concrete is 0.7 times the square root of the characteristic compressive strength of the concrete cube.

For example, M20 grade concrete has a compressive strength of 20 N/mm2 and it's tensile strength is 2 - 3 N/mm2.