Which Cement is Suitable for Marine Work

Answer: D. Blast furnace slag cement

Blast furnace slag cement is suitable for marine work.

Solution

Low heat portland cement

• It contains high percentage of C2S and a low percentage of C3S and C3A.
• Rate of development of strength is low.
• Initial setting time should not be more than 60 minutes.
• It is generally used in mass concrete work like dams, retaining walls, bridges etc.

Rapid hardening cement

• It contains more C3S and less C2S as compared to Ordinary portland cement
• Initial setting time should not be less than 30%
• Ultimate strength of rapid hardening cement is equal to Ordinary portland cement.
• It is used in road repair work,prestress concrete work etc.

Ordinary portland cement

• Obtained by pulverizing argillaceous and calcareous material in proper proportion
• Higher compressive strength at early stage
• It is classified as 33 grade,43 grade,53 grade. The number 33,43 and 53 classified as 28 days characteristics compressive strength of cement
• Commonly used in concrete construction work where there is no exposure to weather.

Blast furnace slag cement

• It is obtained by mixing portland cement,granulated blast furnace slag and gypsum.
• Low heat of hydration
• High sulphate resistance capacity
• Good resistance to marine effects.
• Commonly used in marine work.

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