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1)

Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor Wp/Wf is 0.95, the workability of concrete is

2)

For given water content, workability decreases if the concrete aggregates contain an excess of

3)

M10 grade of concrete approximates

4)

For ensuring quality of concrete, use

5)

According to I.S. : 456, the number of grades of concrete mixes, is

6)

The mixture of different ingredients of cement, is burnt at

7)

After casting, an ordinary cement concrete on drying

8)

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

9)

The standard sand now a days used in India, is obtained from

10)

While compacting the concrete by a mechanical vibrator, the slump should not exceed

11)

An aggregate is said to be flaky if its least dimension is less than

12)

The increased cohesiveness of concrete, makes it

13)

The commonly used material in the manufacture of cement is

14)

For the construction of cement concrete floor, the maximum permissible size of aggregate, is

15)

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

16)

The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

17)

Pick up the correct proportions of chemical ingredients of cement

18)

Transport of concrete by pumps, is done for a distance of

19)

The high strength of rapid hardening cement at early stage, is due to its

20)

Vicat's apparatus is used for

21)

M 150 grade of concrete approximates

22)

Workability of concrete is measured by

23)

The rock which is not calcareous, is :

24)

Internal friction between the ingredients of concrete, is decreased by using

25)


For road pavements, the cement generally used, is