Blended cement – advantages, types and applications

Blended cement – advantages, types and applications- Blended cement are produced by inter-grinding Portland cement clinker together at temperatures of about 1400–1500°C.)

1. Blended Cement – Advantages, Types and Applications

2. Blended cement Blended cement are produced by inter-grinding Portland cement clinker together at temperatures of about 1400–1500°C .) The dominant materials used for blended cement are BFS, fly ash and silica fume.   ASTM C595 provides prescriptive-based specifications for specifically blended cement that consist of portland -cement clinker ground or blended with suitable proportions of granulated blast-furnace slag or natural or artificial pozzolans . 

3. Advantages of blended cement Improves the workability of fresh concrete, making it easier to place and finish. Using less water also reduces shrinkage and permeability . Contribute to the long-term strength gain of concrete. Silica fumes can hasten strength development and reduce curing time . Lower heat of hydration and less risk of thermal cracking Reduces heat of hydration and thermal stresses . Reduced overall concrete cost : The mineral supplements used to replace portland cement require significantly less processing and typically lower the cost of the concrete.

4. Benefits of Blended Cement

5. Type IS (X), Portland-Slag Cement Higher level of compressive strengths in concrete when compared to OPC Higher flexural strength to concrete, which enhances its structural stiffness and minimises load deflections Reduces the ingression of harmful substances such as chlorides and sulphates due to low permeability Environment-friendly due to reduced GHG emissions

6. Type IP (X), Portland- Pozzolan Cement High compressive strength The application includes masonry mortars and plastering Protects concrete against alkali-aggregate reaction Makes the concrete more impermeable and denser

7. Type IL (X), Portland-Limestone Cement Portland-limestone cement (PLC) is a blended cement with a higher limestone content, which results in a product that works the same, measures the same, and performs the same, but with a reduction in the carbon footprint of 10% on average. Increases durability Excellent placing and finishing properties Shrinkage and heat of hydration improved Enhanced setting and strength performance

8. Type IT, Ternary Blended Cement High strength Corrosion resistance ASR resistance Elimination of thermal cracking Low permeability Sulfate resistance

9. Applications Major engineering projects Domestic construction Precast concrete  Stabilisation including pavement recycling for road construction Mining applications Specialist formulations such as adhesives, renders, mortars and grouts

10. Conclusion The growing use of supplementary cementitious material blended portland cement is due in part to numerous performance factors, including low permeability, resistance to chlorides and sulfates, mitigation of alkali-silica reaction, greater strength, lower temperatures for mass concrete, and improved workability.

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