Question Paper: Concrete Technology Question Paper - Jun 16 - Civil Engineering (Semester 5) - Jawaharlal Nehru Technological University (JNTUH)
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Concrete Technology - Jun 16

Civil Engineering (Semester 5)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. Write about bogues compound.
(5 marks) 00

1.b. Write the purpose of using mineral admixtures
(5 marks) 00

1.c. Define bulking of aggregate and write the IS code to be used to perform the test
(5 marks) 00

1.d. What are the causes of bleeding of concrete?
(5 marks) 00

1.e. Define gel space ratio
(5 marks) 00

1.f. Write the applications of F.R.C.
(5 marks) 00

1.g. Define cellular concrete.
(5 marks) 00

1.h. Write the factors influencing creep.
(5 marks) 00

1.i. List out the available methods to proportioning the concrete mixes.
(5 marks) 00

1.j. What are the uses of NDT?
(5 marks) 00

2.a. What is clinker and write the procedure adopted in production of clinker?
(5 marks) 00

2.b. Distinguish between plasticizers and super plasticizers.
(5 marks) 00

OR

3.a. What is meant by Fineness Modulus of sand? Explain the laboratory procedure to find fineness modulus
(5 marks) 00

3.b. Write short notes on alkali aggregate reaction.
(5 marks) 00

4.a Explain the methods available in construction practice to control “segregation” of a concrete mixture.
(5 marks) 00

4.b. Write short notes on maturity concept of concrete.
(5 marks) 00

OR

5.a. What are the factors that influence the strength of cement concrete? Explain Briefly.
(5 marks) 00

5.b. List out the importance of concrete curing.
(5 marks) 00

6.a. Write the applications of the following types of concrete: (i) Polymer concrete. (ii) No fines concrete.
(5 marks) 00

6.b. List out the different varieties of fibers available in market.
(5 marks) 00

OR

7.a. Write the advantages and disadvantages of using high performance concrete in place of normal strength
(5 marks) 00

7.b. Write short notes on: (i) SIFCON. (ii) Self Healing concrete.
(5 marks) 00

8.a. Write the factors which cause the shrinkage of concrete.
(5 marks) 00

8.b. Write short notes on: (i) Modulus of elasticity. (ii) Poisons ratio.
(5 marks) 00

OR

9. Write the test procedure followed to carry out NDT by using rebound hammer?
(5 marks) 00

10. Design a Concrete Mix of M25 grade for a beam. The specific gravities of Coarse Aggregate and Fine Aggregate are 2.6 and 2.8 respectively. The bulk density of coarse aggregate is 16000 kg/m3 and Fineness Modulus of Fine Aggregate is 2.7. A slump of 50 mm is necessary. Design the concrete mix using IS Method. Assume any missing data suitably.
(5 marks) 00

OR

11.a. Write the procedure for mix design with reference to ACI code.

(5 marks) 00

11.b. Write the advantages of adopting mix design proportions as per codal provisions.
(5 marks) 00

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