How to check Level of Slab | Slab Checklist before Casting | Checking Tips for Site Engineers 

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How to check Level of Slab | Slab Checklist before Casting | Checking Tips for Site Engineers
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About This Video ------------------------------------------------------------------------------------
In this video, Er. Akash Bohare, Corporate Trainer of Civil Guruji, explained about How to check Level of Slab | Slab Checklist before Casting | Checking Tips for Site Engineers
If you're a site Engineer or a House Owner, You must know these Important Things before casting steel concrete.
1. Leveling
2. Tapping-RCC Slab Centering tape.
3. Oiling
4. Rcc Slab Centering Removal Time
1. Leveling
The most important thing is to check the Level of centering-Many times, the Slab is very long, so it must be smooth and leveled on every part.
How you’ll check the Centering of the Slab-
Step-by-step Procedure-
a) Set the Main level-
Known as the TBM (Temporary bench mark level) - This Level is taken from the down.
b) Marking in the Column or Rod-
You get the Height below which the actual height of the centering must be decided- because as you know the Plywood are placed at the same level.
c) Take Measurement-
Take the measurement from the Plywood level to the marking (In the Image-29 Inch) and Repeat it with all the Columns and rods.
d) Transfer the Exact level to all Corner-
Now, with the Measuring tape, Check the level from every corner with the Measuring Tap and find out that the Height from the slab centering is the same everywhere.
a. If it’s less- Tell them to get the centering up. If you find the 28 inch, rise the centering to 29 inch.
b. If it’s more- reduce the Height, let’s say if it is 30 Inch; tell the site Engineers to reduce it so make exact 29 Inch.
2. Tapping-Rcc Slab centering Tape
As Plywood is layered in Different Pieces, tap where the Joints are open in the centering.
Tapping the Joints done
why- Because
a) When concrete is poured into the Slab, Water will leak out from the holes.
b) Water cement Ratio- it is Important to maintain the Water cement ratio of the slurry. So to save the Ratio, Voids are to be filled with the Tapping.
3. Oiling
Oiling before Casting Should Be done for the Rcc slab centering-
To find the smooth Surface.
When centering is open-it would be easy to open the plywood.
4. Rcc Slab Centering Removal Time
Your question would be.
After how many days does it take to open the Slab/beam centering?
Slab Centring Open- 14 to 24 Days depending upon the slab or beam span.
Full slab shuttering should be removed after ten days.
Beams and arches removal required 14 days.
If beams and arches are more than 6 meters, then the centering removal time should be 21 days.