# Concrete Technology Questions and Answers – High Strength Concrete

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

1. What could be the possible answer among the following for compressive strength of high strength concrete?
a) 10MPa
b) 20MPa
c) 30MPa
d) 40MPa

Explanation: High strength of concrete has the compressive strength greater or equal to 40MPa.

2. What could be the possible answer among the following for water cement ratio for high strength concrete?
a) .5
b) .45
c) .4
d) .35

Explanation: High strength of concrete made by lowering the water cement ratio nearly equal to 0.35 or less.

3. Due to low w/c ratio ___________
a) It doesn’t cause any problems
b) It causes problems
c) Workability is easy
d) Strength is more

Explanation: Due to low water cement ratio, it causes problems so superplasticizers are used.

4. Which type of aggregates are used to produce 70MPa compressive strength?
a) All in one
b) Fine
c) Coarse
d) Flaky

Explanation: To produce 70 MPa compressive strength, coarse aggregates are being used in HSC.

5. Maximum size of aggregates are used to produce 70MPa compressive strength is ________
a) 20-30 mm
b) 10-20 mm
c) 30-40 mm
d) 40-50 mm

Explanation: Maximum size of aggregates is 20-30 mm are used to produce 70MPa compressive strength.
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6. Maximum size of aggregates are used to produce 100MPa compressive strength is __________
a) 20-30 mm
b) 10-20 mm
c) 30-40 mm
d) 40-50 mm

Explanation: Maximum size of aggregates is 10-20 mm are used to produce 100MPa compressive strength.

7. In bridges, HSC is used.
a) True
b) False

Explanation: In bridges, HSC is being used to reduce the number of beams for supporting span.

8. Use of HSC in column __________
a) It increase the size of the column
b) It decrease the size of the column
c) Doesn’t affect
d) Decrease the strength

Explanation: Use of HSC in the column section decreases the size of the column and used in high rise buildings.

9. Use of HSC in column ___________
a) Decrease the no of steel required in the same column
b) Increase the no of steel required in the same column
c) Decrease the no of steel required in the different column
d) Increase the no of steel required in the different column

Explanation: Use of HSC in a column, decrease the number of steel required in the same column.

10. High strength concrete is defined purely on the basis __________
a) Compressive strength
b) Poor strength
c) Tensile strength
d) Good strength

Explanation: High strength concrete is defined purely on the basis of its compressive strength.

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