Sulphate Resisting Portland
Cement (IS: 12330)
Sulphate Resisting Portland
Cement (IS: 12330): In this cement the amount of tricalcium aluminate
is restricted to on acceptably low value(< 5). It should not be mistaken
for super-sulphated cement. It is manufactured by grinding and intimately
mixing together calcareous and argillaceous and/ or other silica, alumina and
iron oxide bearing materials. The Materials are burnt to clinkering
temperature. The resultant clinker is ground to produce the cement. No material
is added after burning except gypsum and not more than one per cent of
air-entraining agents are added.
Properties:
The specific surface of the cement should not be less than 225 m2/kg.
The expansion of cement is limited to 10 mm and 0.8 per cent, when tested by
Le-chatelier method and autoclave test, respectively. The setting times are
same as that for ordinary Portland cement. The compressive strength of the
cubes should be as follows.
72
± 1 hour 10 N/mm2
168
± 2 hours 16 N/mm2
672
± 4 hours 33 N/mm2
It should have a fineness of 400
m2/kg. The expansion of cement is limited to 5 mm. The initial
setting line of the cement should not be less than 30 mm and the final setting
time should not be more than 600 mm.
This cement can be used as an alternative to order
Portland cement or Portland pozzolana cement or Portland slag cement under
normal conditions. Its use however is restricted where the prevailing
temperature is below 40 o C. Use of sulphate resisting cement is particularly
beneficial in conditions where the concrete is exposed to the risk of
deterioration due to sulphate attack; concrete in contact with soils or ground
waters containing excessive sulphate as well as concrete in sea water or
exposed directly to sea coast.
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