This document discusses high-strength concrete (HSC). It defines HSC as concrete with a 28-day compressive strength of over 40 MPa. HSC uses a low water-cement ratio, smaller aggregate sizes, and admixtures like silica fume and superplasticizers. Compared to normal-strength concrete, HSC has higher resistance to pressure, modulus of elasticity, and strength gained at an earlier age. Some applications of HSC mentioned include bridges, high-rise buildings, power plants, and skyscrapers. The document concludes that interest in HSC is growing rapidly due to its advantages like reduced material needs and increased construction speeds.

1. By
K.Pranuthi-14011D9010

2. Contents
Introduction
Ingredients
Methods used for making HSC
Comparison Between HSC and HPC
Advantages
Applications
Conclusion

3. Introduction
Concrete is defines as High-
Strength Concrete (HSC) only on
the basis of :
 Compressive strength
 At given age

4. 28 day Compressive Strength
• 1970’s 40MPa
• later 60-100MPa

5. Ingredients of HSC
Cement
Sand
Water (Low Water -Cement Ratio)
Optimum sized aggregates (10mm
to 20mm)
Admixtures

6. Admixtures
 Silica fume (To prevent Ca(OH)₂
crystals in cement matrix)
 Water reducing agents (Super
plasticizers)
Dosage rate 5% to 20% or higher by
mass of cementing material.

9. Methods for making HSC
1. Seeding
2. Re-vibration
3. High Speed Slurry
4. Use of admixtures
5. Inhibition of Cracks

11. 6. Sulphur Impregnation
7. Use of Cementitious
aggregates

12. Comparison Between
HSC and NSC
High Resistance to Applied
pressures compared to NSC
 Water Cement Ratio is :
HSC - 0.25
NSC - 0.4 to 0.6

14. Normal
Strength
20-50 MPa
High Strength 50-100 MPa
Ultra High
Strength
100-150 MPa

16.  Aggregate size are:
HSC - 10 mm to 20mm
NSC - 40mm
Higher Modulus of Elasticity
 Lower creep coefficient
 Less deflection
Fracture Surface
HSC – Smooth
NSC - Rough

17. Advantages
Reduces amount of Steel
Reduces Dead Load
Reduces space occupied by
Columns.
Increases rental Space.
High Compressive Strength

18. To use the concrete service at
early age.
Eg :Pavement in 3 days
High rise buildings an be build
by reduced columns.

19. Limitations
Damaged at high temperature
i.e less resistance to fire.
Must be expertise in selection of
ingredients.

20. Applications
Long Span Bridges : Vidya Sagar
Setu at Kolkata

21. High Rise
building :
South Wacker
Drive , Chicago

22. Kaiga
Power
Project

23. Petronas
Towers,
Malaysia

24. Conclusion
 In recent years there has been a
rapid growth of interest in high
strength concrete.
We may use HSC more often in
future.

25. Thank
you