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- Question
For an ordinary Portland cement
Options- A. residual does not exceed 10% when sieved through IS Sieve No. 9
- B. soundness varies from 5 to 10 mm
- C. initial setting time is not less than 30 minutes
- D. compressive stress after 7 days, is not less than 175 kg/cm2
- E. all the above.
- Correct Answer
- initial setting time is not less than 30 minutes
- 1. The datum temperature for maturity by Plowman, is
Options- A. 23°C
- B. 0°
- C. - 5.6°C
- D. - 11.7°C Discuss
- 2. According to the recommendations of IS : 456-1978, the expansion joints
Options- A. are provided where plane changes abruptly
- B. are provided to ensure minimum resistance
- C. are supported on separate columns
- D. do not carry reinforcement across them
- E. all the above. Discuss
- 3. The produce impermeable concrete
Options- A. thorough mixing of concrete is required
- B. proper compaction of concrete is required
- C. proper curing of concrete is required
- D. properly graded and non-porous aggregates are requied
- E. all the above. Discuss
- 4. The final operation of finishing floors, is known as
Options- A. screeding
- B. floating
- C. trowelling
- D. finishing
- E. all the above. Discuss
- 5. Segregation is responsible for
Options- A. honey-combed concrete
- B. porous layers in concrete
- C. surface scaling in concrete
- D. sand streaks in concrete
- E. all the above. Discuss
- 6. Workability of concrete for a given water content is good if the aggregates, are
Options- A. rounded aggregate
- B. irregular aggregate
- C. angular aggregate
- D. flaky aggregates. Discuss
- 7. 1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of
Options- A. coarse aggregates
- B. fine aggregates
- C. neither (a) nor (b)
- D. both (a) and (b)
- E. none of these. Discuss
- 8. You are asked to construct a massive dam, the type of cement you will use, is
Options- A. ordinary Portland cement
- B. rapid hardening cement
- C. low heat cement
- D. blast furnace slag cement
- E. white cement. Discuss
- 9. Pick up the correct statement from the following:
Options- A. According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight
- B. According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky
- C. According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous
- D. All the above. Discuss
- 10. Ordinary concrete is not used for concrete grade
Options- A. M 100
- B. M 150
- C. M 200
- D. M 250
- E. M 400 Discuss
Concrete Technology problems
Search Results
Correct Answer: - 11.7°C
Correct Answer: all the above.
Correct Answer: all the above.
Correct Answer: trowelling
Correct Answer: all the above.
Correct Answer: rounded aggregate
Correct Answer: both (a) and (b)
Correct Answer: low heat cement
Correct Answer: All the above.
Correct Answer: M 400
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