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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-IV EXAMINATION WINTER 2018
Subject Code:X40602 Date: 22/11/2018
Subject Name: Concrete Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Discuss about effect of size, shape and texture of coarse aggregate on strength of concrete.
07

Explain various methods of transporting concrete.
07
Q.2

What is admixture? Discuss the role of plasticizer and super-plasticizer in concrete.
07

Enlist various tests as per IS to determine workability of concrete. Describe slump cone test and the different slump pattern.
07
OR

Why curing is necessary? Enlist various methods of curing and explain any two method of curing.
07
Q.3

Describe initial setting time and final setting time of cement as per IS.
07

Write various factors affecting strength of hardened concrete. Explain any one factor.
07
OR
Q.3

Differentiate shrinkage and creep.
07

Explain in brief about sulphate attack and chloride attack on hardened concrete.
07
Q.4

Describe ultrasonic pulse velocity test with its limitations.
07

What is carbonation of concrete? Describe procedure to determine carbonation of concrete.
07
OR
Q.4

Distinguish high strength concrete and high performance concrete.
07

Describe procedure of underwater concreting.
07
Q.5

Explain IS method of concrete mix design steps.
07

Explain repairing technique for distressed column.
07
OR
Q.5

Write short-note on:
Segregation
Finishes of concrete
Fiber reinforced concrete
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