Concrete Technology, Question Paper of Civil Engineering 4th Semester, Download Question Paper 12

S .B. Roll no _____

CONCRETE TECHNOLOGY

4^th Exam / civil / 4051/ May’10

Duration 3 hrs

Section – A

1.     Fill in the blanks

a.     In fineness test of Ordinary Portland cement, the residue on I.S. sieve no. 9 should not be more than _____

b.     When fully saturated , the bulking of sand is ______

c.      The phenomenon by virtue of which the plastic cement paste changes into solid mass is known as _____

d.     In concrete, the only lubricant available is ____

e.      As the internal fraction of aggregates increases , workability ____

f.       The ratio of various ingredients in concrete of grade M150 is ____

g.     The appearance of water on the surface of concrete after compaction  is called _____

h.     The separation of coarse aggregates form cement water paste is called ______

i.       The concrete should not be placed during ________

j.       The mixing of water should be chilled in very hot weather by ______

State true of false.

a.     Accelerators are used during hot weather.

b.     The water cement ratio should not be kept constant.

c.      Quantity of cement is measured by volume.

d.     The curing rate of concrete is changed by temperature.

e.      Harshness results in porous concrete.

Section –B

Note : Attempt any ten questions

2.      

a.     Define concrete ?

b.     Differentiate between  ordinary concrete and controlled concrete?

c.      Name the main chemical compounds presents in Ordinary Portland cement?

d.      What do you understand by setting and hardening of cement ?

e.      Differentiate between volume batching and weight beaching?

f.       What is the effect of Gypsum on setting time ?

g.     What do you mean by segregation?

h.     Why concrete should be workable?

i.       Differentiate between accelerators and retarders in concrete?

j.       Why cement should not be allowed to come in moisture contact?

k.     Differentiate between initial setting and final setting of cement ?

l.       Why slum test is performed?

Section –C

Note : Attempt any three questions

3.     Define workability of concrete ? explain the various factors affecting workability

4.     Define curing ? explain the various methods of curing.

5.     Describe SLUMP test  for concrete ? what are the limitations of this test?

6.     Discuss various precautions required for hot weather concreting?