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1. For quality control of Portland cement, the test essentially done is
2. To ensure constant moisture content in aggregates
3. Construction joints are provided
4. An aggregate is said to be flaky if its least dimension is less than
5. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning1 : 1 : 2
6. The increased cohesiveness of concrete, makes it
7. The ratio of the length to breadth of a wooden float, is
8. The maximum amount of dust which may be permitted in aggregates is
9. Proper proportioning of concrete, ensures
10. The bulk density of aggregates does not depend upon
12. While compacting the concrete by a mechanical vibrator, the slump should not exceed
13. After casting, an ordinary cement concrete on drying
14. Hydration of cement is due to chemical action of water with
15. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
16. Permissible compressive strength of M 300 concrete grade is
17. The standard sand now a days used in India, is obtained from
18. M10 grade of concrete approximates
19. For ensuring quality of concrete, use
20. The risk of segregation is more for
