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Wednesday, February 1, 2017




S .B. Roll no _____
CONCRETE TECHNOLOGY
4th Exam / civil / 5107/ May’09
Duration 3 hrs
Section – A
1.     Fill in the blanks
a.     The active group of concrete consists of _____ and ____
b.     Commonly used cement for constriction is known as ___cement.
c.      Due to smooth and rounded structure there is _______- locking among the rounded aggregates.
d.     Water cement ratio is weight of ____ weight of _____
e.      Compressive strength of concrete is expressed in ______
f.       1 bag of cement = _______ kg = _____ litres.
g.     Retarders are added to concrete to make ______-- weather concreting easy.
h.     Ready mixed concretes are very useful in _______ sites.
i.       For better mixing the tilting type mixer drum should be placed at an angle of _______ to vertical.
j.       Joints in beam and slabs should be formed at  points of minimum _____
Section –B
Note : Attempt any ten question
2.      
a.     What is cement? Why this material is so popular.
b.     Differentiate between fine and coarse aggregate.
c.      Give short notes on various characteristics of aggregates.
d.     State the water cement ratio law as given by Abram.
e.      How does size of aggregate effect workability?   
f.       What is nominal concrete mix?
g.     Why is blast furnace slag used as an admixture?
h.     What are the function and uses of an accelerator?
i.       What is the important of finishing?
j.       Name various types of joints?
k.     What do you mean by batching? Name its types.
l.       Give the stripping time for various types of work.
Section –C
Note : Attempt any three questions
3.       
a.     Name the various operations for making concrete.
b.     Write down the precautions while placing of concrete.
4.     What is the effect of hot weather on concreting operation and what precautions should be taken against it?
5.     Give the difference between nominal mix and controlled mix.
6.     Explain the various factors affecting workability?
7.     What is fineness modulus? Explain a method to determine the finesses modulus of an aggregate.




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