No. of Printed Pages : 4

BCE-044

DIPLOMA IN CIVIL ENGINEERING DCLE(G) / DCLEVI Term-End Examination CJ I

June, 2017

IL

BCE-044 : CONCRETE TECHNOLOGY Time : 2 hours

Maximum Marks : 70

Note : Question no. 1 is compulsory and in addition answer any other four questions. 1. (a)

Explain any two of the following in brief : (2 — 3 lines only) : 2x2=4 (i)

Fineness modulus

(ii)

Hydration of cement

(iii) Soundness of cement (b) Fill in the blanks (attempt any four).

4x12 — =6

(i)

Initial setting time of ordinary Portland cement should not be less than minutes.

(ii)

In the fineness test of Ordinary Portland Cement, the residue on IS Sieve No. 9. should not be more than %.

(iii) Water-cement ratio determines the of concrete. BCE-044

1

P.T.O.

are used in heavy wall

(iv)

construction. (v)

slump indicates that The concrete mix is not suitable for placement.

(c) Select the correct option (attempt any

4x1=4

four). (i)

The first compound to react with water when mixed with water is C 2S/C3A.

(ii)

Change of state of cement paste from fluid to solid is called setting/hardening.

(iii) Ratio of cement to sand for compressive strength of cement test is 1 : 3/1 : 4. (iv)

The aggregates of size < 4.75 mm are called fine aggregate/coarse aggregate.

(v)

Needle vibrator/Form vibrator is generally used for compaction of concrete.

2. (a) Differentiate between any following terms :

BCE-044

two of the 2 x4=8

(i)

Hand Compaction and Mechanical Compaction

(ii)

Weight-Batching and Volume-Batching of Aggregates

(iii)

Heavy Concrete and Mass Concrete 2

2x3=6

(b) Define any two of the following :

(i)

Flakiness Index

(ii) Workability (iii) Initial Setting Time 3.

(a) What are the physical properties cement ? (b) Explain cement.

4.

5.

6.

compressive

strength

test

of 8

of 6

(a) Explain Aggregate Crushing Value test.

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(b) Discuss briefly the effect of Aggregate properties on the strength of concrete.

6

(a) Explain compaction factor test.

8

(b) Describe segregation of concrete and list out the factors responsible for it.

6

(a) Why is concrete required to be compacted ? State the methods and explain in brief.

8

(b) What is curing ? State its importance. Enlist different methods of curing. BCE-044

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P.T.O.

7.

Write short notes on any

four

following :

of the 4x3 =14 2

(a) Gunite (b) Pre-cast Concrete (c) Rapid Hardening Cement (d) Soundness of Cement (e)

BCE-044

Importance of W/C for Concrete

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