Column casting before brick masonry or after? (Part-2)/ Pros & cons of framed structure.

 Part -1   👈 Back   

Let us go through the pros & cons of constructing the column before the brick masonry.

Advantages:

1. The dimensions of the column are accurate as formworks are used on all sides.

2. Slurry leakage at the joints can be avoided.

3. No water absorption & hence strength is maintained.

4.  You can achieve the required verticality of the column  & its designated position. 

5. You can provide proper cover for the reinforcement.

Disadvantages:

1. The bond between the brick masonry & column concrete is weak when compared to confined masonry.

2. The shuttering on all sides adds extra cost to your budget.

3. Hacking is a must on the surface of the column that joins with the brick wall.

If you want to know the procedure & specifications of hacking, Go through the article 👇

👀. What is hacking in civil construction?- Purpose & technical specification of hacking.

4. You have to use chicken mesh to avoid cracks at the time of plastering.

5. Construction cost increases due to extra shuttering work, chicken mesh, bonding agents, hacking work, etc.

My suggestion:

If you want quality work & are ready to add 3 to 4% extra to the construction cost, go through the following procedure.

1. Cast all the columns up to the base of the sill level. The standard height of the sill is 0.9m. (3' ).

2. After hacking & necessary curing, brick masonry should be built up to the base of the sill level. Use bonding agents over the column surface to gain extra grip with masonry.

 3. Provide an RCC band up to the sill level over the brick masonry. The reinforcement provided in the band should pass through the columns. This RCC band should be run over all the brick masonry throughout the building. 

4. Now, concrete the column up to the base of the lintel level. The standard height of the lintel is 2.1m. ( 7').

5. Again, build the brick masonry up to the level of the lintel base as you did earlier. 

6. The lintel of the required specification with necessary sunshades & projections should be cast.

7. The column should be cast up to the beam's bottom level.

8. The brick wall should be constructed up to the level of the beam bottom.

9. After the completion of the curing period, start the centering work of the slab.

Here, the beam does not need formwork at the bottom. While casting the beam, wetting & adding cement slurry over the masonry surface is a must.

Note:

The above-mentioned procedure is for ground & G +1 type of residential buildings. For multi-storeyed buildings, frames are the priority member followed by the masonry works.

For all such articles over useful tips, click here.

Thank you for going through this article❤. Have a good day 😄.

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