Volume-IF - JantERmantER

DCPL-K4A02
TABLE - IV
SCHEDULE OF REMOVAL OF FORM
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Ordinary Portland
Rapid Hardening Portland
Cement Concrete
Cement Concrete
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Part of Temperature Deg.C Temperature Deg.C
Structure
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Above 40 Deg.- 20 Deg.-Below Above 40 Deg.- 20 Deg.- Below
40 Deg.C 20 Deg. 5 Deg. 5 Deg. 40 Deg. 20 Deg. 5 Deg. 5 Deg.
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Days Days Days Days
Days Days Days Days
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a) Columns 2 1 1 Do not 1 1 1 Do not
& Walls remove remove
forms until
forms
b) Beam sides 3 2 3 site cured 2 1 1 until
test speci-
site
c) Slabs, 10 7 8 men develop 7 4 5 cured
125 mm at least test
50% of the specimd)
Slabs over specified en dev-
125 mm 28 days elop at
thick and strength least
soffit of 18 14 16 12 8 9 50% of
minor beams
the specified
28
e) Soffit of 24 21 22 14 10 12 days
main beams
strength
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Wherever exposed surfaces of concrete can be effectively sealed to prevent loss of
water, the periods specified for temperature above 40 Deg.C can be reduced to those of
the temperature range of 20 Deg.C to 40 Deg.C subject to approval of the Engineer.
Construction joints in beams, if required to be provided, will be located within the middle
third of span according to clause 3.13.1(b) of this specification. In such cases,
however, entire span of beam shall have to be kept supported by formwork till its removal
for the portion of beam, cast at a later date, is due and so approved by the Engineer.
If any type of cement other than ordinary portland cement and Rapid
hardening portland cement is used the time of removal or forms shall be
revised as approved by the Engineer such that the strength of this cement
(PCA.774.S034sca3) V.II-D2/S-III : 32