# Concrete Technology Questions and Answers – Soundness of Aggregates

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

1. What is soundness?
a) Soundness of cement is the property by virtue of which the cement does not undergo any appreciable expansion
b) Soundness of cement is the property by virtue of which the cement does undergo any appreciable expansion
c) Soundness of cement is the property by virtue of which the cement does not undergo any appreciable contraction
d) Soundness of cement is the property by virtue of which the cement does undergo any appreciable contraction

Explanation: Soundness of cement is the property by virtue of which the cement does not undergo any appreciable expansion.

2. Which apparatus we need to find soundness?
a) Le Chatelier
b) Vicat’s apparatus
c) CTM
d) Pat test

Explanation: This test is performed with the help of Le Chatelier apparatus as shown in figure below. It consists of a brass mould of diameter 30 mm and height 30 mm.

3. Why do we need to find soundness?
a) To detect the uncombined lime in cement
b) To detect the combined lime in cement
c) To detect the combined alumina in cement
d) To detect the uncombined alumina in cement

Explanation: Soundness Test on Cement. Soundness Test onCement is carried out to detect the presence of uncombined lime in cement.

4. What is the maximum size of split?
a) 1mm
b) .5mm
c) 10mm
d) 2mm

Explanation: There is a split in mould and it does not exceed 0.50 mm. On either side of split, there are two indicators with pointed ends. The thickness of mould cylinder is 0.50 mm.

5. Le Chatelier apparatus consist of ___________
a) Brass mould
b) Steel mould
c) Aluminum mould
d) Wooden mould

Explanation: Le Chatelier apparatus consist of brass mould with the diameter of 30mm and height of 30 mm.

6. When the cement paste is filled in mould and kept in water. Then what should be the temperature of water?
a) 24-35°C
b) 20°C
c) 30-40°C
d) 50°C

Explanation: A small weight is placed at top and the whole assembly is submerged in water for 24 hours. The temperature of water should be between 24°C to 35°C.

7. Expansion should not be more than _____________
a) 5mm
b) 10mm
c) 5cm
d) 10cm

Explanation: The difference between the two readings indicates the expansion of cement and it should not exceed 10 mm.

8. If the Y is the reading of sand surface (ml) then what is the percentage of bulking?
a) % of bulking {(200/Y)-2} x 100
b) % of bulking {(200/Y)-1} x 100
c) % of bulking {(100/Y)-2} x 100
d) % of bulking {(100/Y)-1} x 100

Explanation: % of bulking {(200/Y)-1} x 100. Report the percentage bulking of the sand to the nearest whole number.

9. What is the size of caliper?
a) 30cm
b) 50cm
c) 30mm
d) 40mm

Explanation: Generally the size of the caliper is 30cm with the least count of .5mm with the 100ml of measuring cylinder.

10. What is the standard value of expansion for super sulphated cement?
a) 10mm
b) 5mm
c) 1mm
d) .5mm

Explanation: It is the standard value for super sulphated cement under IS:6909-1990.

Sanfoundry Global Education & Learning Series – Concrete Technology.

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