In normal circumstances, formwork of slabs may be removed (Props left under) after expiry of -

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UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. 1 day after casting 
  2. 3 days after casting 
  3. 14 days after casting 
  4. 21 days after casting 

Answer (Detailed Solution Below)

Option 2 : 3 days after casting 
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Detailed Solution

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Concept:

As per IS 456 2000, minimum period before striking formwork for various components are as follows-

Type of Formwork Minimum Period
Before Striking
Formwork
Vertical formwork to columns,
walls, beams
16-24 h
Soffit formwork to slabs
(Props to be re-fixed
immediately after removal
of formwork)
3 days
Soffit formwork to beams
(Props to be re-fixed
immediately after removal
of formwork)
7 days
Props to slabs:1) Spanning up to 4.5 m
2) Spanning over 4.5 m

7 days

14 days

Props to beams and arches: 1) Spanning up to 6 m
2) Spanning over 6 m

14 days

21 days

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