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Question
What is minimum period before striking the formwork to RCC slabs (with props to be refixed immediately after removal of formwork) ?
A.
7 days
B.
14 days
C.
21 days
D.
3 days
Answer ( Option D)

3 days

Solution

As per IS 456 : 2000, Cl 11.3.1:
Type of Formwork Minimum Period Before Striking Formwork
(a) Vertical formwork to columns, walls, beams 16-24h
(b) Soffit formwork to slabs (Props to be refixed immediately after removal of formwork) 3 days
(c) Soffit formwork to beams (Props to be refixed immediately after removal of formwork) 7 days
(d) Props to slabs  
  1. Spanning up to 4.5 m 7 days
  2. Spanning over 4.5 m 14 days
(e) Props to beams and arches:  
  1. Spanning up to 6 m 14 days
  2. Spanning over 6 m 21 days

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