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For normal M20 reinforced concrete, the time of removing the vertical form work for columns as per IS 456 is ______


1. 1 day
2. 3 days
3. 14 days
4. 28 days

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Correct Answer - Option 1 : 1 day

Concept:

As per IS: 456-2000 clause 11.3.1

In normal circumstances where ambient temperature does not fall below 15°C and where ordinary Portland cement is used and adequate curing is done, following striking period may deem to satisfy the guideline given below.

S.No.

Type of formwork

Minimum period before striking formwork

 01

Vertical formwork to columns, walls, beams

 16-24 hour

 02

Soffit formwork to slabs (Props to be fixed immediately after removal of formwork)

 3 days

 03

Soffit formwork to beams (Props to be refixed immediately after removal of formwork)

 7 days

 04

Props to slabs:

1) Spanning up to 4.5 m

2) Spanning over 4.5 m

 

 7 days

 14 days

 05

Props to beams and arches

1) Spanning up to 6 m

2) Spanning over 6 m

 

 14 days

 21 days


For normal M20 reinforced concrete, the time of removing the vertical form work for columns as per IS 456 is 1 day.

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