Match the following lists :
| List-I (Cement mortar for different works) | List-II (Proportion of cement : Sand in mortar) |
|---|---|
| P.Normal brickwork | 1.1 : 4 |
| Q.Plastering work | 2.1 : 3 |
| R.Grouting cavernous rocks | 3.1 : 6 |
| S.Guniting | 4.1 : 1·5 |
Select the correct answer using the code given below :
- A2 4 1 3
- B3 1 4 2Correct
- C1 2 4 3
- D3 2 1 4
Solution
Concept
Mortar mixes for different works
Step-by-step solution
1. Normal brickwork: 1:6 → 3. 2. Plastering: 1:4 → 1. 3. Grouting of cavernous rocks: rich mix 1:1.5 → 4. 4. Guniting (shotcrete): 1:3 → 2.
Explanation
Mortar richness depends on the work: ordinary masonry uses lean mixes, plaster uses a medium mix, while grouting and guniting need richer mixes for strength and bonding.
Why the other options are wrong
Other codes give a rich 1:3 or 1:1.5 mix to normal brickwork, or a lean mix to grouting, which is not the usual practice.
Shortcut
Brickwork 1:6, plaster 1:4, gunite 1:3, grout 1:1.5.
Common mistake
Using 1:4 for brickwork.
Correct answer: B) 3 1 4 2