Concrete Technology, Question Paper of Civil Engineering 4th Semester, Download Question Paper 1

S .B. Roll no _____

CONCRETE TECHNOLOGY

4^th Exam / civil / 5161/ May’05

Duration 3 hrs

Section – A

1.     Fill in the blanks

a.     Aggregate is a ____ materials.

b.     Appearance of water on freshly laid concrete is called _______

c.      Period of curing should be _______ as the temperature falls.

d.     Surface area of aggregate __________ by reducing size of coarse aggregate.

e.      Bleeding of concrete occurs if water in concrete is ____

2.      State true of false

a.     In plastic state concrete is called green concrete.

b.     Concrete is a mixture of cement, sand and water.

c.      Only standard sand is used for conducting compressive strength test.

d.     Repair of concrete is easier than repair of brickwork

e.      Tar felt is used as a water proofing material.

3.      Choose the correct one

a.     The admixtures used to increase the rate of  hydration is cold weather are called ______ ( accelerators, de-accelerators)

b.     Construction joint should be ____ as for a possible. (allowed, avoided)

c.      Controlled concrete has _________ grades ( 5, 7, 9)

d.     Surface vibrator is effective only when thickness does not exceed ____ ( 50, 15,70,60)

e.      Lesser is the size of aggregate _________ is the quantity of cement required ( less, more)

Section –B

Note : Attempt ten questions

4.       

a.     Differentiate between setting and hardening of cement.

b.     Write a note on repid  hardening cement.

c.      What is compaction of concrete ? explain.

d.     Discuss fineness modulers.   

e.      What is all in aggregate?

f.       Why concrete should be workable?

g.     Write a note on standard sand.

h.     Discuss colored cements?

i.       What are accelerators and retarders as used in concrete ?

j.       What are pazzolanic cements?

k.     Write the short note on cold weather concreting?

l.       What are concrete vibrators? Where immersion vibrators are used ?

Section –C

Note : Attempt any three questions

5.     Why curing is required ? discuss

6.     What is the effect of shape of coarse aggregate on the workability and strength of concrete ?

7.     Are construction joints necessary ? if so why ? precaution taken at the time of leaving construction.

8.     What is waterproof concrete and how it is prepared ? what materials are used?