This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Strength and Durability Relationship”.

1. Durability of concrete is proportional to _________

a) Sand content

b) Water cement ratio

c) Aggregate ratio

d) Cement aggregate ratio

View Answer

Explanation: Volume chances due to difference in thermal properties of the aggregates and cement paste.

2. Strength of concrete show an increase with _________

a) Decrease in rate of loading

b) Increase in rate of loading

c) Unaffected by rate of loading

d) Depends on application of load

View Answer

Explanation: Strength of concrete is directly proportional to the nature of the loading.

3. Strength of concrete is ___________

a) \(f_{ck} = K(\frac{c}{C+W+A})^2\)

b) \(f_{ck} = K(\frac{C+A}{C+W+A})^2\)

c) \(f_{ck} = K(\frac{C+W}{C+W+A})^2\)

d) \(f_{ck} = K(\frac{C+W+A}{C+W+A})^2\)

View Answer

Explanation: It is the formula to find the Strength of concrete when we have the volume of cement, aggregates and water.

4. As per & 5456:200 Young’s modulus of concrete is _______________

a) 1000 f_{ck}

b) 5000 f_{ck}^{2}

c) 5700 f_{ck}

d) 150 f_{ck}

View Answer

Explanation: 5000 f

_{ck}

^{2}is the formula of young’s modulus of the concrete according to IS 5456:200.

5. Strength of concrete is proportional to ______________

a) Sand content

b) Water cement ratio

c) Aggregate ratio

d) Cement water ratio

View Answer

Explanation: Strength of concrete is proportional to Cement water ratio and inversely proportional to w/c ratio.

6. Strength of concrete increase with _____________

a) Increase with w/c ratio

b) Decrease with w/c ratio

c) Decrease in size of aggregates

d) Decrease in curing time

View Answer

Explanation: As mentioned above that Strength of concrete is inversely proportional to w/c ratio.

7. Strength of concrete increase with _________

a) Increase with w/c ratio

b) Increase in fineness of cement

c) Decrease in size of aggregates

d) Decrease in curing time

View Answer

Explanation: Strength of concrete increase with increase in fineness of the cement.

8. Approximate ratio of the strength of the cement conc of 7 days to that of 28 days (2/3)?

a) .75

b) .85

c) 1

d) 1.15

View Answer

Explanation: After the lab broke the seven-day cylinders, the cylinder from the pier with added water broke at 1980 psi. The other seven-day cylinders were as high as 2620 psi.

9. Approximate ratio of strength of the 30 cm cube to that of 15 cm cube is _____________

a) 1.1

b) 1

c) .9

d) .75

View Answer

Explanation: The strength of cylinder with diameter of 15cm and 30cm tall can be approximated as 0.84 of the strength of a 15x15x15 cm cube according to Eurocodes.

10. Approximate ratio of direct tensile strength to flexural strength is ____________

a) .25

b) .33

c) .5

d) .05

View Answer

Explanation: Approximate ratio of direct tensile strength to flexural strength is .5 according to the formula.

**Sanfoundry Global Education & Learning Series – Concrete Technology.**

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