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Super sulphated cement is manufactured by grinding together a mixture of 80-85 percent granulated slag, 10-15 per cent hard burnt gypsum, and about 5 per cent Portland cement clinker. The product is ground finer than that of Portland cement.
Specific surface must not be less than 4000 sq.cm per gm.
This cement is rather more sensitive to deterioration during storage than Portland cement.
This cement has high sulphate resistance. Because of this property this cement is particularly recommended for use in foundation, where chemically aggressive conditions exist.
As super-sulphated cement has more resistance than Portland blast furnace slag cement to attack by sea water, it is also used in the marine works.
Other areas where super-sulphated cement is recommended include the fabrication of reinforced concrete pipes which are likely to be buried in sulphate bearing soils. The substitution of granulated slag is responsible for better resistance to sulphate attack.
When we use super sulphated cement the water/ cement ratio should not be less than
0.5. A mix leaner than about 1:6 is also not recommended.
0.5. A mix leaner than about 1:6 is also not recommended.
