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B.Tech.IV Semester(Main/Back) Examination JunelJuly - 2015 '

Civil Engineering

ACEZ AC o ncrete Technolo gY

Time : 3 Hours Maximum Marks : 80

Min. Passing Marks : 26

Attempt any Jive questions, selecting one question from each unit. All questions

carty equal marks. (Schematic diagrams must be shown wherever necessar)).

Any data you feel missing suitably be assumed and stated clearly.

(Jnits of quantities used/calculated must be stated clearly.

Use of following supporting material is permitted during examination.

1. IS 10262

1. a)

b)

1. a)

b)

Unit - I

Discuss physical properties of aggregates to be used irl cement concrete' (6)

Enumerate basic compounds of cement and discuss their hydration rate and

resulting compounds of hydration.

c) Discuss get - sPace ratio.

(8)

(2\

(4)

(4xZ)

(4)

OR

Discuss role of water-cement ratio.

Describe methods of determination (with help of figures) for

) Workability

ii) Flowability of concrete

c) Discuss C-S-H gel, and its significance.

484112 lzots (1) IContd....

2. a)

b)

b)

c)

b)

c)

(8)

(8)

3. a)

b)

4- a)

b)

2. a)

3. a)

Unit - trI

Write and explain factors affecting cot-npressive strength of concrete. (6)

What do you understand by creep of concrete. Explain the factors affbcting

it.

c) Explain the application of rebound hammer.

OR

Explain application and use of ultrasonic pulse velocitl' tneter u'ith

figures.

Explain the use of 'core sampling'.

Explain characteristics of 'aggregate-cement interface'.

Unit - IilExplain various methods of placing and

suitability.

transportation of concrete and their

Describe equipments and Methods of compaction of concrete.

Enumerate any four factors affecting durability of concrete.

OR

Describe various methods and their suitability for curing of concrete.

Describe various types of concrete mixers and their suitability.

Unit - IV

Discuss quality control measures for concrete.

Design a concrete mix of grade M25 by I.S. method, using ordinary portland

cement of 43 Grade fine aggregate conforming to Zone II, assutning quality

control as good. Take specific gravities of fine aggregate and coarse aggregates

3.15,2.85 and 2.60 respectively. Use maximutn size of aggregates as 2Otrrm.

(12)

OR

a) Explain the types and uses of water reducing and superplasticising admixtures

for concrete.

Explain the use of accelerators, and retarders.

Explain the properties and use of flyash and silica fume (separately) in concrete.(8)

(B)

t2\

help of(B)

(4)

(4)

(8)

(6)

(2)

(4)

4.(4)

(4)b)

c)

4E4tt2 (2)

5. a)

b)

c)

b)

c)

Unit - V

Describe typical formworks for columns and beams. Through figures' (8)

Describe salient features of under water concreting through figures' . . (6)

Enumerate salient features of sulfate resisting concrete. Q)

5. a)

OR

Discuss self compacting concrete, its salient properties and applications.

Discuss salient properties of high strength concrete and its applications'

Discuss about slip and moving form work

(8)

(4)

(4)

(3)4E4112