Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Item
Walls
Columns
Sides of beams and girders
Pan joist forms
30 in. wide or less
over 30 in. wide
Arch centers
Joist, beam, or girder soffits
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Under 10 ft clear span
between structural supports
10 to 20 ft clear span
between structural supports
Over 20 ft clear span between supports
One-way floor slabs
Under 10 ft clear span between supports
10 to 20 ft clear span between supports
Over 20 ft clear span between supports
Two-way slab systems
Posttensioned slab system
Time
12 hours
12 hours
12 hours
3 days
4 days
Where structural live load is
Less than
structural dead
load
14 days
7 days
14 days
21 days
Greater than
structural dead load
7 days
7 days
14 days
14 days
4 days
3 days
7 days
4 days
10 days
7 days
Removal times are contingent on
reshores, where required, being placed
as soon as practicable after stripping
operations are complete but not later
than the end of the working day in which
stripping occurs. Where reshores are
required to implement early stripping while
minimizing sag or creep, the capacity
and spacing of such reshores should be
specified by the engineer/architect.
As soon as full posttensioning has been
applied
Notes:
1. Reprinted from ACI Committee 347, Guide to Formwork for Concrete, American
Concrete Institute.
2. Where such forms also support formwork for slab or beam soffits, the removal time
of the latter should govern.
3. Distances between supports refer to structural supports and not to temporary
formwork or shores.
4. Where forms may be removed without disturbing shores, use half of values shown,
but not less than 3 days.
5. See Chapter 6 for special conditions affecting number of floors to remain shored or
reshored.
TABLE 5-9 Suggested Minimum Time Forms and Supports Should Remain in
Place under Ordinary Conditions
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