Is 456 Amendment 5
Is 456 Amendment 5
Is 456 Amendment 5
5 JULY 2019
TO
IS 456 : 2000 PLAIN AND REINFORCED CONCRETE —
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CODE OF PRACTICE
(Fourth Revision)
[Page13, clause 5.1 (a)] — Substitute the following for the existing:
(Page 13, clause 5.2) — Insert the following after the title:
‘Mineral admixtures listed below may be used along with ordinary Portland
cement. Uniform blending of the mineral admixtures with the cement should be
ensured.’
(Page 13, clause 5.2.1) — Substitute the following for the existing clause:
‘5.2.1 Pozzolanas
[Page 13, clause 5.2.1.2 (see also Amendment No. 2)] — Delete the
following:
(Page 13, clause 5.2.1.4) — Substitute the following for the existing
clause:
Price Group 2
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Amendment No. 5 to IS 456 : 2000
‘5.2.1.4 Metakaolin
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Metakaolin conforming to IS 16354 may be used as part replacement of
ordinary Portland cement.’
(Page 13, clause 5.2.2) — Substitute the following for the existing clause:
‘5.2.3 Precautions
5.2.3.1 For concrete made with mineral admixtures, the setting time and rate of
gain of strength may be different from those of concrete made with ordinary
Portland cement alone. Cognizance of such modified properties shall be taken
into account in deciding de-shuttering time, rate of movement of formwork in
slipform construction, initial time of prestressing, longer curing period and for
early age loading. The compatibility of chemical admixtures and cementitious
materials should be ensured by trials.
5.2.3.4 Mixes that contain very fine mineral admixtures such as silica fume, can
be sticky and difficult to finish.
(Page 14, clause 5.3, line 1) — Insert, ‘derived from natural sources and
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from other than natural sources,’ after ‘Aggregates’.
(Page 17, clause 8.1.1, para 3, first sentence) — Insert the following after
first sentence:
(Page 19, Table 4, Note 4) — Substitute the following for the existing:
‘4 The cement contents given in col 7 of this table are the minimum recommended. For SO3 contents
near the upper limit of any class, cement contents above these minimum are advised. For the
purpose of calculation of SO3 content (if the test results are in the form of SO4, the following
relation shall be used: SO3 = 0.833 SO4.’
(Page 20, clause 8.2.5.3, line 6) — Insert ‘(where SO3 = 0.833 SO4)’ after
‘SO3’.
[Page 20, clause 8.2.5.4, para 2, (b)] — Substitute the following for the
existing:
‘b) Use of low alkali ordinary Portland cement having total alkali content
not more than 0.6 percent [as Na2O equivalent (expressed as Na2O +
0.658 K2O)].
‘and where ordinary Portland cement is used and adequate curing is done’
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Amendment No. 5 to IS 456 : 2000
(Page 25, clause 11.3.1, informal table) — Substitute the following for the
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existing table:
NOTE — Utmost care shall be taken to provide props. The props shall be provided
immediately after stripping each shuttering panel and not after stripping all the panels
of the entire slab.
(Page 25, clause 11.3.1, last sentence) — Delete the words ‘other cements
and’.
‘11.3.1.1 In case of use of cements other than OPC or in case of use of mineral
admixtures like fly ash and slag, in lieu of the minimum period specified in
11.3.1 col 3, the stripping of formwork may be done in accordance with the
provisions of 11.3.1 col 2, provided concrete cube testing is done to ensure that
the following minimum strength is achieved:
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Amendment No. 5 to IS 456 : 2000
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b) 7 days : 60 percent of specified strength
c) 14 days : 85 percent of specified strength
(Page 26, clause 13.3.1, sentence one) — Substitute the following for the
existing:
(Page 33, clause 21.1, sentence four) — Substitute the following for the
existing sentence:
[Page 45, clause 26.2.5.1 (g)] — Insert the following para at the end:
(Page 72, clause 40.2.3.1) — Substitute the following for the existing:
‘40.2.3.1 For solid slabs, the nominal shear stress shall not exceed half the
appropriate values given in Table 20.
Maximum shear stress, τ c max given in Table 20 is valid for all load cases
including earthquake except the following:
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Amendment No. 5 to IS 456 : 2000
where ℓs is the clear span of the coupling beam and D is its overall
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depth, the entire earth quake induced shear and flexure shall,
preferably, be resisted by diagonal reinforcement.
𝑉𝑉u
𝐴𝐴sd =
1.74𝑓𝑓y sin 𝛼𝛼
where Vu is the factored shear force and α is the angle made by the
diagonal reinforcement with the horizontal. At least 4 bars of 8mm
diameter shall be provided along each diagonal. The reinforcement
along each diagonal shall be enclosed by special confining
reinforcement, as per 8 of IS 13920 : 2016. The pitch of spiral or
spacing of ties shall not exceed 100 mm.
(Page 77, Annex A) — Substitute the following for the existing entries
against concerned Indian Standards:
IS No. Title
269 : 2015 Ordinary Portland cement — Specification (sixth
revision)
383 : 2016 Coarse and fine aggregate for concrete —
Specification (third revision)
455 : 2015 Portland slag cement — Specification (fifth
revision)
875 (Part 3) : 2015 Wind loads (third revision)
1489 Portland Pozzolana cement — Specification
(Part 1) : 2015 Fly ash based (fourth revision)
(Part 2) : 2015 Calcined clay based (fourth revision)
1641 : 2013 Code of Practice for fire safety of buildings
(general) : General principles of fire grading and
classification (second revision)
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Amendment No. 5 to IS 456 : 2000
IS No. Title
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1642 : 2013 Fire safety of buildings (general) : Details of
construction — Code of Practice (second revision)
1786 : 2008 High strength deformed steel bars and wires for
concrete reinforcement — Specification (fourth
revision)
3812 (Part 1) : Pulverized fuel ash: Part 1 For use as pozzolana in
2013 cement, cement mortar and concrete (third revision)
6006 : 2014 Uncoated stress relieved strand for Pestressed
concrete — Specification (second revision)
13920 : 2016 Ductile design and detailing of reinforced concrete
structures subjected to seismic forces — Code of
Practice (first revision)
14268 : 2017 Uncoated stress relieved low relaxation seven-wire
(Ply) strand for prestressed concrete — Specification
(first revision)’
[Page 78, Annex A, entries pertaining to ‘IS 4656 : 1968’, ‘IS 8112 : 1989’,
‘IS 12089 : 1987’ and ‘IS 12269 : 1987’] — Delete.
(Page 79, Annex A) — Insert the following new entries at the end:
(CED 02)
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