What is the permissible range of granulated slag in Portland Slag Cement?

25 to 70 percent by mass (Clause 4.1.1).

What is the minimum initial setting time for PSC?

30 minutes, which is identical to standard OPC (Table 2).

Why choose PSC over OPC?

PSC offers superior resistance to chloride and sulfate attacks, generates lower heat of hydration, and improves the long-term durability of concrete in aggressive environments.

IS 455

: 2015

Portland Slag Cement - Specification

CurrentFrequently UsedSpecificationMaterials Science · Cement

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This standard specifies the manufacturing, chemical, and physical requirements for Portland Slag Cement (PSC). Engineers and QA/QC professionals use this specification to ensure the quality of PSC, which is highly valued for marine environments, sewage treatment plants, and mass concrete works due to its high sulfate resistance and low heat of hydration.

Specifies requirements for portland slag cement (PSC) made by grinding together OPC clinker, granulated blast furnace slag, and gypsum.

Quick Reference Values

slag constituent proportion25% to 70% by mass

initial setting time min30 minutes

final setting time max600 minutes

compressive strength 3 days min16 MPa

compressive strength 7 days min22 MPa

compressive strength 28 days min33 MPa

fineness blaine specific surface min225 m2/kg

insoluble residue max4.0%

Practical Notes

Portland Slag Cement gains strength more slowly in the initial days compared to Ordinary Portland Cement (OPC), so curing periods must be properly maintained and extended.

PSC is highly recommended for structures exposed to aggressive environments like sea water or sulphate-bearing soils.

The exact percentage of slag used (between 25% to 70%) must be declared by the manufacturer on the cement bags.