For cement concrete, the stress-strain curve is approximately linear upto

3/4 of ultimate stress

5/8 of ultimate stress

1/2 of ultimate stress

1/3 of ultimate stress

Initially, all stress strain curves are fairly straight; stress and strain are proportional.
With this stage, the material should be able to retain its original shape if the load is removed.
The elastic range of concrete stress – strain curve continues up to 0.45fc? (maximum concrete compressive strength).
It is half of the ultimate stress.

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