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
View Answer

Answer: a
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
View Answer

Answer: a
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
View Answer

Answer: a
Explanation: Soundness Test on Cement. Soundness Test onCement is carried out to detect the presence of uncombined lime in cement.
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4. What is the maximum size of split?
a) 1mm
b) .5mm
c) 10mm
d) 2mm
View Answer

Answer: b
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
View Answer

Answer: a
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
View Answer

Answer: a
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
View Answer

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

Answer: b
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
View Answer

Answer: a
Explanation: Generally the size of the caliper is 30cm with the least count of .5mm with the 100ml of measuring cylinder.
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10. What is the standard value of expansion for super sulphated cement?
a) 10mm
b) 5mm
c) 1mm
d) .5mm
View Answer

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

Sanfoundry Global Education & Learning Series – Concrete Technology.

To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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