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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?
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?
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?
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?
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:
Compared to mild steel, cast iron has (i) High compressive strength (ii) High tensile strength (iii) Low compressive strength (iv) Low tensile strength
Compared to mild steel, cast iron has
(i) High compressive strength
(ii) High tensile strength
(iii) Low compressive strength
(iv) Low tensile strength
Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.Select your answer according to the codes given below:
Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.
Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.
Select your answer according to the codes given below:
In a masonry wall, the strength of the mortar should be __________ that of the masonry unit.