The modulus of rupture of concrete gives

a)
The tensile strength of the concrete under bending

b)
The direct compressive strength of the concrete

c)
The direct tensile strength of the concrete

d)
The characteristic strength of the concrete

Correct answer is option 'A'. Can you explain this answer?

Question

The modulus of rupture of concrete gives

a)
The tensile strength of the concrete under bending
b)
The direct compressive strength of the concrete
c)
The direct tensile strength of the concrete
d)
The characteristic strength of the concrete

Correct answer is option 'A'. Can you explain this answer?

Answer

Modulus of Rupture of Concrete

The modulus of rupture of concrete is defined as the maximum tensile stress that a concrete specimen can withstand just before it breaks under a bending load. It is also known as flexural strength or bending strength of concrete. The modulus of rupture is a measure of the tensile strength of concrete under bending stress.

Direct Tensile Strength of Concrete

The tensile strength of concrete is significantly lower than its compressive strength. However, it is not easy to measure the direct tensile strength of concrete due to the difficulty in applying a direct tensile load on the specimen. Therefore, the modulus of rupture is used as an indirect measure of the tensile strength of concrete.

When a concrete beam is subjected to a bending moment, the tensile stress is developed at the bottom surface of the beam. As the bending moment increases, the tensile stress also increases until it reaches the modulus of rupture of concrete. At this point, the concrete specimen starts to crack and eventually fails under the applied load.

Other Properties of Concrete

The compressive strength of concrete is the maximum compressive stress that a concrete specimen can withstand before it fails under a compressive load. It is an important property of concrete and is used for design purposes. The characteristic strength of concrete is the minimum strength required for a particular grade of concrete. It is used for quality control purposes.

Conclusion

In conclusion, the modulus of rupture of concrete is an indirect measure of the tensile strength of concrete under bending stress. It is not the same as the compressive strength or characteristic strength of concrete.

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