Concrete Technology, Question Paper of Civil Engineering 4th Semester, Download Question Paper 7

S .B. Roll no _____

CONCRETE TECHNOLOGY

4^th Exam / civil / 4051/ May’09

Duration 3 hrs

Section – A

1.     Fill in the blanks

a.     For controlled concrete quantity of sand is measured by ____

b.     The volume of one 590 kg bag of cement is _____

c.      Maximum quantity of water per bag of constant for M20 grade concrete required ______

d.     Finer the sand particles ______will be the bulking.

e.      The first compound of cement to react with water is ______

f.       The initial setting time of cement should not be ______30 minute.

g.     Plain concrete is very weak in ______

h.     Cement is always batched by _____

i.       Less the W/C ratio ____________ is the strength of concrete.

j.       The chemical reaction between cement and water is called ________ of cement.

Choose the correct one.

i.       Coaser the aggregate   ________ is the value of fineness modulus (higher/ lower)

j.       The maximum percentage of chemical ingredients in cement is that of ____(lime /silica)

k.     The separation of coarser particles of chemical ingredients in cement is that of ______(lime/silica )

l.       The separation of coarser particles of concrete during transportation is known as ____ (bleeding /segregation )

m.  A compacting factor of 0.85 for a concrete indicates a mix of ____workability (low /high)

n.     Fineness modulus number for coarse sand varies from ___(2.9 to 3.2/ 3.2 to 3.6)

Note: Attempt any ten questions

2.      

a.     Explain repair and maintenance of concrete.

b.     List methods of finishing concrete and explain any one.

c.      What are the various causes of form work failures?

d.     List the methods of mixing concrete and write advantages of tilting type mixer.

e.      Explain the suitability of different types of fibers used in fibres reinforced concrete.

f.       Describe the effect of hot weather on concrete.

g.     Define retarders and list some retarder materials.

h.     List the properties of concrete in plastic stage and explain any one.

i.       Explain how heat cement and its uses.

j.       Explain how size of aggregate affects the property of concrete.

k.     Discuss the various deleterious materials in aggregate.

l.       What are the various requirements of good aggregate?

Note : Attempt any three questions

3.     Define W/C ratio. What is the effect of various W/C ratio on the physical structure of cement.

4.     Define workability explain various factors those affects the workability.

5.     Explain the objects and methods of curing of concrete.

6.     Explain the advantages and disadvantages of concrete over other construction materials.