IS 456 2000 Code Update pdf

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Clause - 5.3 Aggregates
Before Amendment
Aggregates shall comply with the requirements of IS 383. As far as possible preference shall be given to natural aggregates.
After Amendment
Aggregates shall comply with the requirements of IS 383.

Clause - 5.3.4
Before Amendment
Coarse and fine aggregate shall be batched separately. All- in-aggregate may be used only where specifically permitted by the engineer-in-charge.
After Amendment
Coarse and fine aggregate shall be batched separately.

Clause - 5.4 Water
Before Amendment
Water used for mixing and curing shall be clean and free from injurious amounts of oils, acids, alkalis, salts, sugar, organic materials, or other substances that may be deleterious to concrete or steel.
After Amendment
Water, natural or treated, used for mixing and curing shall be clean and free from injurious amounts of oils, acids, alkalis, salts, sugar, organic materials, or other substances that may be deleterious to concrete or steel.

Clause - 5.4.3 Sea Water
Before Amendment
Mixing or curing of concrete with seawater is not recommended because of the presence of harmful salts in seawater. Under unavoidable circumstances, seawater may be used for mixing or curing in plain concrete with no embedded steel after having given due consideration to possible disadvantages and precautions including the use of an appropriate cement system.
After Amendment
Seawater shall not be used for mixing or curing concrete because of the presence of harmful salts. Under unavoidable circumstances, seawater may be used for mixing or curing in plain concrete with no embedded steel after having given due consideration to possible disadvantages and precautions including the use of an appropriate cement system.

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IS 456