Mortar | Civil Engineering SSC JE (Technical) - Civil Engineering (CE) PDF Download
Chapter 3
MORTAR
-Mortar is the term which is used to describe the paste obtained by the addition of water in the mixture of binding material like cement or lime and aggregate like sand in definite proportion.
-The binding material used may also be referred as matrix and the aggregate used may also be referred as adulterant. Hence, mortar is a mixture of matrix & adulterant.
Qualities of good sand to be used in preparation of mortar:-
(1) It should be free from the presence of organic and vegetative matter.
(2) it should be free from the presence of chemical salts.
(3) it should be comically inert. (should not react with binding material)
(4) it should be well graded.Question for MortarTry yourself:What are the qualities of good sand used in the preparation of mortar?
View Solution
Function of sand in Mortar:-
(1) To provide bulk: -sand in mortar does not gives strength to it but adds bulk or volume in the mortar. Thereby, helps in reducing its cost by increasing its volume.
(2) Strength: -Sand helps in adjusting the strength of the mortar that is achieved by increasing or decreasing its proportion in it.
(3) Surface area:-Sand subdivides the paste of binding material into numerous layers thereby, increases the surface area over which mortar can be spread or adhered. (4) shrinkage:- Sand in mortar prevents the shrinkage during its setting process.
Qualities of good mortar:-
(1) Mortar should not affect the durability of the construction unit in which it comes in contacts with.
(2) It should be capable of developing the design stresses.
(3) It should be capable of resisting the penetration of water through it.
(4) It should be cheap, durable and should posses high work ability (should not set early)
Types of mortar to be used for different construction activities
| Types of construction | Types of Mortar |
| (1) Pointing works | Cement mortar 1:1 maximum strength |
| (2) Damp proof course (DPC) | Cement mortar 1:2 |
| (3) Concrete pavement | Cement mortar 1:2 (wear & tear) |
| (4) Plastering | Cement mortar 1:3 / lime mortar 1:2 |
| (5) Masonary in super structure | Cement mortar 1:3 / lime mortar 1:2 |
| (6) Masonary in fundation | Cement mortar 1:6 / lime mortar 1:3 |
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FAQs on Mortar - Civil Engineering SSC JE (Technical) - Civil Engineering (CE)
| 1. What is mortar made of? |  |
Ans. Mortar is typically made of a mixture of cement, sand, and water. It is used in construction to bind bricks, stones, or other materials together.
| 2. How is mortar different from concrete? | |
Ans. While both mortar and concrete involve a mixture of cement, sand, and water, the main difference lies in their ratios and purposes. Mortar has a higher proportion of sand compared to concrete, making it more workable for holding materials together, whereas concrete has a higher proportion of cement and is used for structural purposes.
| 3. What are the different types of mortar? | |
Ans. There are various types of mortar available, each designed for specific applications. Some common types include cement mortar, lime mortar, and epoxy mortar. Cement mortar is widely used for general construction, lime mortar is preferred for historic preservation or restoration projects, and epoxy mortar is used for specialized applications such as tile installation or chemical-resistant coatings.
| 4. How long does mortar take to dry? | |
Ans. The drying time of mortar depends on various factors such as temperature, humidity, and the type of mortar used. Generally, mortar can take anywhere from a few hours to a few days to dry. However, it is important to allow sufficient curing time before subjecting it to heavy loads or stress.
| 5. Can mortar be used for repairs? | |
Ans. Yes, mortar can be used for repair work. It can be used to fill cracks, patch damaged areas, or replace deteriorated mortar joints. However, it is crucial to match the type and color of the existing mortar to ensure a seamless repair and maintain the structural integrity of the construction.
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