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Wednesday, February 1, 2017




S .B. Roll no _____
CONCRETE TECHNOLOGY
4th Exam / civil / 5161/ May’08
Duration 3 hrs
Section – A
1.     Fill in the blanks
a.     A good concrete should be prepared from _____ and durable aggregates.
b.     Initial setting time of OPC is _____ minutes.
c.      The water cement ratio law was established by _____
d.     Stump test performed determine the _____ of concrete.
e.      Cement bags should be stored _____ cm away from wall.
State true or false:
f.       Quantity of cement is measured by volume.
g.     Concrete mix 1:6:12 is used for mass concrete foundations.
h.     In concrete, the only lubricant available is wastes.
i.       Concrete is not fire resisting
j.       The curing rate of concrete is changed by temperature.
Choose the correct one.
k.     Strength of concrete (increases/decreases) with age.
l.       Large size of aggregates requires(more/less) cement.
m.  Segregation of concrete (increases / decreases) the strength of concrete.
n.     The slump is zero, then the mix (is/is not) suitable for high strength concrete.
o.     The ratio of cement, sand, coarse aggregate in m20 is (1:2:4,1:5:3,1:1:2)
Section –B
Note: attempt any ten questions.
2.       
a.     What are the desired properties of freshly mixed concrete?
b.     What are the physical properties of cement?
c.      Which cement will you use for mass concrete and why?
d.     What do you mean by segregation?
e.      What is a controlled concrete ?
f.       How will you store cement at site?
g.     What is volume batching of concrete?
h.     Define and list equipment used for had mixing of concrete ingredients.
i.       List and give brief description of vibration used for concreting.
j.       Define consistency of concrete, durability of concrete.
k.     Sketch one form work for rectangular column.
l.       List three air – entraining agents.
Section –C
Note : attempt nay three questions.
3.       
a.     Give a list of special types of concrete. Also give the uses of each.
b.     How will you carry out the fineness lest of cement and why is it advisable to check it for soundness?
c.      Write short note on
                                                             i.      Cold weather  concreting
                                                           ii.      Accelerators in concrete.
d.     Define workability of concrete and list four essentials of a workable concrete.   




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