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- Question
Concrete gains strength due to
Options- A. chemical reaction of cement with sand and coarse aggregates
- B. evaporation of water from concrete
- C. hydration of cement
- D. All the above.
- Correct Answer
- hydration of cement
- 1. Pick up the correct statement from the following:
Options- A. The concrete gains strength due to hydration of cement
- B. The concrete cured at a temperature below 23°C, gains strength up to 28 days
- C. The concrete does not set at freezing point
- D. The strength of concrete increases with its age
- E. All the above. Discuss
- 2. For the construction of thin R.C.C. structures, the type of cement to be avoided, is
Options- A. ordinary Portland cement
- B. rapid hardening cement
- C. low heat cement
- D. blast furnace slag cement
- E. sulphate resisting cement. Discuss
- 3. The dimensions of a 35 litre forma for measuring aggregates by volume, are :
Options- A. length 30 cm, breadth 25 cm, height 30 cm
- B. length 39 cm, breadth 25 cm, height 32 cm
- C. length 27 cm, breadth 27 cm, height 48 cm
- D. length 220 cm, breadth 25 cm, height 40 cm
- E. none of these. Discuss
- 4. Workability improved by adding
Options- A. fly ash
- B. hydrated lime
- C. calcium chloride
- D. bentonite
- E. all the above. Discuss
- 5. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than
Options- A. 20.5 mm
- B. 30.5 mm
- C. 40.5 mm
- D. 50.5 mm
- E. none of these. Discuss
- 6. If the slump of a concrete mix is 60 mm, its workability is
Options- A. very low
- B. low
- C. medium
- D. high
- E. none of these. Discuss
- 7. Water cement ratio is generally expressed in volume of water required per
Options- A. 10 kg
- B. 20 kg
- C. 30 kg
- D. 40 kg
- E. 50 kg Discuss
- 8. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for
Options- A. 20 times
- B. 25 times
- C. 30 times
- D. 40 times
- E. 50 times Discuss
- 9. Pick up the correct statement from the following:
Options- A. Sand obtained from pits, is washed to remove clay and silt
- B. Sand obtained from flooded pits, need not be washed before use
- C. Sea shore sand contains chlorides which cause effloresance
- D. The chloride in sea shore sand and shingle may cause corrosion of reinforcement if the concrete is porous
- E. All the above. Discuss
- 10. The shuttering of a hall measuring 4 m x 5 m, can be removed after
Options- A. 5 days
- B. 7 days
- C. 10 days
- D. 14 days
- E. 21 days Discuss
Concrete Technology problems
Search Results
Correct Answer: All the above.
Correct Answer: blast furnace slag cement
Correct Answer: length 27 cm, breadth 27 cm, height 48 cm
Correct Answer: all the above.
Correct Answer: 40.5 mm
Correct Answer: medium
Correct Answer: 50 kg
Correct Answer: 25 times
Correct Answer: All the above.
Correct Answer: 7 days
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