# Concrete Technology Questions and Answers – Strength and Durability Relationship

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

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

2. Strength of concrete show an increase with _________
d) Depends on application of load

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

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 fck
b) 5000 fck2
c) 5700 fck
d) 150 fck

Explanation: 5000 fck2 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

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

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

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

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

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

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

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