When steel reinforcing bars are provided in masonry, the bars shall have an embedment with adequate cover in cement-sand mortar not leaner than

Consider the following statements:
(i) Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.
(ii) Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.
(iii) Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.
Which of these statements are correct?

A

(i), (ii) and (iii)

B

(i) and (ii)

C

(ii) and (iii)

D

(i) and (iii)

Where the masonry is provided with steel reinforcing bars, the bars should be embedded with adequate cover in cement concrete of grade _________

A

M 5

B

M 10

C

M 35

D

M 15

Consider the following related to sand in mortars: 1. It increases the volume of the mortar mix. 2. It increase the strength of masonry. 3. The cost of the mortars is reduced. 4. Shrinkage of the mortar is almost prevented. 5. Surkhi can replace sand in cement mortar used in plastering and this modified mortar is more durable. Which of the above are relevant to ‘sand’ in mortar?

A

1, 2, 4 and 5

B

1, 3 and 4 only

C

3, 4 and 5 only

D

2, 3 and 4 only

Consider the following statements regarding bands to be provided for strengthening masonry work in masonry buildings constructed in zone III, IV and V.
(i) Lintel band is provided at lintel level on partition walls,
(ii) Gable band is provided at top of gable masonry below the purlins,
(iii) The bands shall be to full width of the wall and not less than 7.5 cm in depth,
(iv) The bands shall be made of reinforced concrete only.
of these statements, the correct statements are

A

(i) and (ii)

B

(i) and (iii)

C

(ii) and (iv)

D

(ii) and (iii)

Consider the following statements related to composite mortar: 1. Addition of lime to cement mortar improves its workability 2. Composite mortar is obtained by adding 10% by weight of cement and mixing with water. 3. Composite mortar is not preferred in tall buildings 4. Mechanical grinding is essential for developing composite mortar. Which of the above statements are true in this case?

A

1, 2 and 3 only

B

1, 3 and 4 only

C

2, 3 and 4 only

D

1, 2, 3 and 4

Consider the following statements: 1. Bricks in masonry arc bound by mortar. 2. Mortars make bricks damp. proof. 3. Strength of brick in masonry is improved by plastering. 4. Addition of lime improves workability. 5. Marine constructions need sulphate-resistant cement mortar. Which of the above statements are relevant for 'cement mortar?

A

1, 2 and 3

B

2, 3 and 4

C

1, 4 and 5

D

3, 4 and 5

Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys
(i) Shall not exceed 12 if lime mortar is used
(ii) Shall not exceed 18 if cement lime mortar 1 : 2 : 9 is used
(iii) Shall not exceed 24 if cement mortar 1 : 6 is used

A

(i) and (ii) are correct

B

(ii) and (iii) are correct

C

(i) and (iii) are correct

D

(i) and (ii) and (iii) are correct

Which of the following are correct for cover to reinforcement? 1. The reinforcement shall have a minimum clear cover of 20 mm or diameter of such bar whichever is More. 2. At each end of reinforcing bar not less than 25 mm nor less than twice the diameter of such bar 3. Increased cover thickness may be provided when surface of concrete is exposed to the action of harmful chemicals.

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Which of the following specifications are not correct with reference to brickwork? a. Brickwork shall be done in such a way that all joints are full of mortar. b. For all exposed brickworks, double scaffolding having two sets of vertical supports shall be provided. c. Bricks required for brick masonry with mud mortar need not be soaked.

A

a and b only

B

a and c only

C

b and c only

D

None of these

Assertion A : For identical strength, a composite cement-lime mortar is preferred over cement mortar.Reason R : Composite cement-lime mortar has higher drying shrinkage than cement mortar.Select your answer based on the codes given below. Codes:

A

Both A and R is true and R is the correct explanation of A

B

Both A and R is true but R is not a correct explanation of A

C

A is true but R is false

D

A is false but R is true

Nature of Work	Cement Sand Mortar ratio
Reinforced Brickwork	1 : 3
Plaster work	1 : 3 to 1 : 4
Stone Masonry	1 : 6
General RCC work	1 : 3
Damp Proof Courses	1 : 2
Cement-Concrete Roads	1 : 2

When steel reinforcing bars are provided in masonry, the bars shall have an embedment with adequate cover in cement-sand mortar not leaner than

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