IS 455
Cement - Portland Slag Cement
Summary
Portland Slag Cement is a blended cement made by grinding Portland cement clinker with granulated blast furnace slag and gypsum. It offers improved durability, lower heat of hydration, and better resistance to chemicals, making it suitable for marine structures, foundations, and mass concrete works.
Why BIS Certificate is Mandatory for PORTLAND SLAG CEMENT ?
BIS certification is mandatory for Portland Slag Cement to ensure consistent quality, strength, and durability in construction. It confirms compliance with Indian Standards, prevents the use of substandard cement, ensures structural safety, and protects public interest in infrastructure and building projects across India.
What is BIS Certified for PORTLAND SLAG CEMENT ?
The BIS certified specification for Portland Slag Cement is IS 455: Portland Slag Cement — Specification. It defines requirements for chemical composition, fineness, setting time, compressive strength, soundness, and performance tests, ensuring reliability and long-term durability in construction applications.
Test required For PORTLAND SLAG CEMENT
| Title | Mandatory/Optional |
|---|---|
| Granulated Slag | Optional |
| Ground Granulated Blast Furnace Slag | Optional |
| Clinker | Required |
| Insoluble residue | Required |
| Magnesia | Required |
| Total Sulphur content calculated as sulphuric anhydride (SO3) | Required |
| Sulphide Sulphur (S) | Required |
| Loss on ignition | Required |
| Chloride Content | Required |
| Alkali Content | Optional |
| Fineness | Required |
| Soundness (Le-Chatelier method and Autoclave method) | Required |
| Setting Time | Required |
| Compressive strengtht | Required |
| Optional | Required |
| nsoluble Residue | Optional |
| Soundness | Optional |
Benefits of BIS Certification for PORTLAND SLAG CEMENT
1. Assured Structural Safety - BIS certification ensures PSC meets strength and performance standards, reducing the risk of cracks, failures, and structural damage in buildings and infrastructure.
2. Consistent Product Quality - Certified cement undergoes regular testing and inspection, ensuring uniform composition, reliable setting time, and predictable performance at construction sites.
3. Enhanced Durability - BIS-approved PSC provides better resistance to sulfates, chlorides, and moisture, increasing the life of structures, especially in coastal and industrial environments.
4. Legal and Market Compliance - BIS certification is compulsory in India, allowing manufacturers and importers to sell PSC legally and participate in government and large-scale infrastructure projects.
5. Trust and Brand Credibility - The BIS mark builds confidence among engineers, builders, and consumers, improving brand reputation and acceptance in competitive construction markets.