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ESE 2021 Technical Quiz || Concrete

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Question 1

Consider the following statements concerning
‘elasticity of concrete’.
1) Stress-strain behaviour of concrete is a straight line up to 10% of ultimate stress.
2) Strain determination is obtained from tangent modulus.
3) Modulus of elasticity of concrete is also called as secant modulus.
Which of the above statements are correct?

Question 2

Assertion (A): Even though vibration is the best technique of obtaining a durable and strong concrete, it cannot produce a compact concrete, if the mix is not properly graded or designed.
Reason (R): Over-vibrating of concrete with a slump of more than 10 cm may lead to honeycombing and a top surface which is not durable.

Question 3

Consider the following statements regarding Cyclopean concrete

1) Size of aggregate is more the 150 mm

2) Size of aggregate is less than 150 mm

3) High slump

4) High temperature rise due to heat of hydration

Which of the above statement are correct

Question 4

Consider the following statements as describing the Rheological behaviour of fresh concrete:
1) Newtonian
2) Non-Newtonian
3) Ratio of shear stress to shear rate is constant
4) Ratio of shear stress to shear rate depends upon the shear rate
Which of these statements are correct?

Question 5

Statement (I): Inherent weakness of finished plain concrete is the presence of micro-cracks at the aggregate interface. It is minimized by placing fibres in the concrete mix.
Statement (II): The fibres help to transfer all incidental loads at the internal micro-cracks.
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Nov 9ESE & GATE CE