By

K.Pranuthi-14011D9010

ContentsIntroduction

Ingredients

Methods used for making HSC

Comparison Between HSC and HPC

Advantages

Applications

Conclusion

Introduction

Concrete is defines as High-

Strength Concrete (HSC) only on

the basis of :

Compressive strength

At given age

28 day Compressive Strength

• 1970’s 40MPa

• later 60-100MPa

Ingredients of HSCCement

Sand

Water (Low Water -Cement Ratio)

Optimum sized aggregates (10mm

to 20mm)

Admixtures

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.

Methods for making HSC1. Seeding

2. Re-vibration

3. High Speed Slurry

4. Use of admixtures

5. Inhibition of Cracks

6. Sulphur Impregnation

7. Use of Cementitious aggregates

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

Normal

Strength

20-50 MPa

High Strength 50-100 MPa

Ultra High

Strength

100-150 MPa

Aggregate size are:HSC - 10 mm to 20mm

NSC - 40mm

Higher Modulus of Elasticity Lower creep coefficient Less deflectionFracture Surface

HSC – Smooth NSC - Rough

AdvantagesReduces amount of Steel

Reduces Dead Load

Reduces space occupied by Columns.

Increases rental Space.

High Compressive Strength

To use the concrete service at early age.

Eg :Pavement in 3 days

High rise buildings an be build by reduced columns.

LimitationsDamaged at high temperature i.e less resistance to fire.

Must be expertise in selection of ingredients.

ApplicationsLong Span Bridges : Vidya Sagar

Setu at Kolkata

High Rise building : South Wacker Drive , Chicago

Kaiga Power Project

PetronasTowers,Malaysia

Conclusion In recent years there has been a

rapid growth of interest in high

strength concrete.

We may use HSC more often in

future.

Thank

you