What is the main advantage of Super Sulphated Cement?

Its primary advantage is high resistance to sulphate attack, making it suitable for marine structures, foundations in sulphate-rich soils, and sewage systems.

What is the minimum 28-day compressive strength required for this cement?

The minimum 28-day compressive strength for a cement-sand mortar cube is 30 MPa, as per Table 2.

What are the main components of Super Sulphated Cement?

It is primarily composed of at least 80% granulated blast furnace slag, inter-ground with calcium sulphate and a small amount of Portland cement clinker or lime as an activator (Clause 3).

What is the required fineness for this cement?

The minimum specific surface area (fineness) must be 400 m²/kg when tested using Blaine's air permeability method (Table 2).

IS 6909

: 1990

Super Sulphated Cement - Specification

CurrentSpecializedSpecificationMaterials Science · Cement

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This standard lays down the manufacturing and testing requirements for super sulphated cement. This cement is characterized by its high resistance to chemical attack, especially from sulphates, making it ideal for marine construction and foundations in aggressive soil conditions.

Specifies requirements for super sulphated cement, suitable for marine works and sulphate-aggressive environments.

Quick Reference Values

Minimum granulated blast furnace slag content80% by mass

Minimum fineness (Blaine's)400 m²/kg

Minimum 3-day compressive strength15 MPa

Minimum 7-day compressive strength22 MPa

Minimum 28-day compressive strength30 MPa

Maximum initial setting time240 minutes

Maximum final setting time360 minutes

Maximum expansion (Le Chatelier)5 mm

Practical Notes

Super sulphated cement exhibits slower strength gain compared to OPC, particularly at lower temperatures, which requires careful consideration during formwork removal planning.

It has a low heat of hydration, making it very suitable for mass concrete pours to control thermal cracking.

The resulting concrete has a characteristic lighter or whitish colour compared to concrete made with OPC.