Self_Compacting_Concrete_Presentation.pptx

Self_Compacting_Concrete

1. Self-Compacting Concrete (SCC) Civil Engineering Department Government Polytechnic Diploma Civil Engineering

2. Introduction • Self-Compacting Concrete (SCC) is a highly flowable concrete. • It spreads into place without mechanical vibration. • Developed in Japan (1980s) to improve construction quality. • Eliminates problems of vibration and segregation.

3. History & Development • First developed in Japan in late 1980s. • Need arose due to shortage of skilled workers. • Prof. Okamura developed first SCC mix. • Since then widely adopted in Europe & worldwide.

4. Properties of SCC • High flowability – can flow under its own weight. • Passing ability – flows around reinforcement without blocking. • Segregation resistance – prevents separation of aggregates. • High deformability & filling ability.

5. Materials Used in SCC • Cement • Fine aggregate (Sand) • Coarse aggregate (smaller size preferred) • Mineral admixtures (Fly ash, GGBS, Silica fume, etc.) • Chemical admixtures (Superplasticizers, VMA) • Water

6. Mix Design of SCC • Rich mortar matrix with lower coarse aggregate content. • High powder content (~450–600 kg/m³). • Water/powder ratio: 0.8 – 1.1 by volume. • Use of superplasticizer to achieve high workability. • Viscosity modifying agent (VMA) for stability.

7. Workability Tests for SCC • Slump Flow Test (Filling ability). • L-Box Test (Passing ability). • V-Funnel Test (Flow time). • U-Box Test (Flow & filling ability). • J-Ring Test (Passing ability with obstruction).

8. Advantages of SCC • No vibration required → reduced noise. • Faster construction. • Better surface finish. • Improved durability. • Safer working conditions. • Suitable for heavily reinforced sections.

9. Disadvantages of SCC • Higher cost due to admixtures. • Need for strict quality control. • Limited availability of materials. • Risk of segregation if improperly mixed.

10. Applications of SCC • High-rise buildings. • Bridges and flyovers. • Precast concrete industry. • Repair works. • Structures with congested reinforcement.

11. Case Studies • Used in Akashi-Kaikyo Bridge, Japan. • Widely applied in European tunnels. • High-rise towers in Dubai and Singapore. • Increasing usage in India for metro projects.

12. SCC vs Conventional Concrete • SCC: No vibration, better finish, higher cost. • Conventional: Needs vibration, cheaper, lower workability. • SCC provides long-term durability benefits.

13. Challenges in SCC • Lack of awareness and training. • Higher cost discourages use. • Need for precise mix design. • Dependence on chemical admixtures.

14. Future of SCC • Increasing adoption in smart cities. • Integration with green construction. • Use of industrial waste materials. • Advances in admixture technology. • Potential for 3D printing in construction.

15. Conclusion • SCC is a revolutionary material in construction. • Provides superior quality, finish, and durability. • Widely used in modern infrastructure projects. • Future scope in sustainable and advanced construction.