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For normal M 20 reinforced concrete, the minimum time of removing the props of form work for slabs with spans less than 4.5 m is _________
1. 21 days
2. 3 days
3. 7 days
4. 28 days

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Correct Answer - Option 3 : 7 days

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

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