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Design of Concrete Structures-Data Intensity 1 Multiple Questions and Answers.
| 6. | As compared to ordinary portland cement, use of pozzuolanic cement? | ||
| A. | reduces workability | ||
| B. | increases bleeding | ||
| C. | increases shrinkage | ||
| D. | increases strength | ||
| 8. | The most commonly used admixture which prolongs the setting and hardening time is_______? | ||
| A. | gypsum | ||
| B. | calcium chloride | ||
| C. | sodium silicate | ||
| D. | all of the above | ||
| 9. | The strength of concrete after one year as compared to 28 days strength is about____? | ||
| A. | 10 to 15% more | ||
| B. | 15 to 20% more | ||
| C. | 20 to 25% more | ||
| D. | 25 to 50% more | ||
| 10. | Admixtures which cause early setting, and hardening of concrete are called______? | ||
| A. | workability admixtures | ||
| B. | accelerators | ||
| C. | retarders | ||
| D. | air entraining agents | ||
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