The strength of a material is defined as the ability to resist stress without failure. It is important to note that High strength and High-performance concrete are not synonymous. Concrete is defined as High strength concrete on the basis of its compressive strength measured at a given age. In early 1970’s any concrete mixture that showed 40MPa or more compressive strength at 28 days were design as High strength concrete. Later 60-100MPa concrete mixture was commercially developed and used in the construction of high rise buildings and long-span bridges in many parts of the world.

1. HIGH STRENGTH
AND
HIGH PERFORMANCE
CONCRETE
Presented By
AHSAN RABBANI
CIVIL ENGINEERING DEPARTMENT

2. INTRODUCTION
• Strength of a material is defined as the ability to resist
stress without failure.
• It is important to note that High strength and High
performance concrete are not synonymous.
• Concrete is defined as High strength concrete on the basis
of its compressive strength measured at a given age.
• In early 1970’s any concrete mixture that showed 40MPa or
more compressive strength at 28 days were design as High
strength concrete.
• Later 60-100MPa concrete mixture were commercially
developed and used in the construction of high rise
buildings and long span bridges in many parts of the world.

3. Why do we need high strength concrete?
To put the concrete into service at much earlier age,
for example opening the pavement at 3-days.
To build high rise buildings by reducing column
sizes and increasing available spaces.
For the same magnitude of loading longer spans and
fewer beams.
To satisfy the specific needs of special applications
such as durability, modulus of elasticity and
strength.

4. The definition of High Performance Concrete is
more controversial.
Mehta and Aitcin used the term HPC for concrete
mixtures possessing high workability, high durability
and high ultimate strength.
ACI defined HPC as a concrete meeting special
combinations of performance and uniformity
requirements that cannot always be achieved routinely
using conventional constituents and normal mixing,
placing, and curing practice.
WHAT IS HIGH PERFORMANCE CONCRETE ?

5. These concrete almost always has a higher
strength than normal concrete.
However, strength is not always the primary
required property.
For example, a normal strength concrete with
very high durability and very low permeability is
considered to have high-performance properties.
Typically, such concretes will have a low water-
cementing materials ratio of 0.20 to 0.45.
CONTD…..

6. Concrete that last longer and possess the following
salient features is called High performance concrete
(HPC).
-High workability
-High strength
-High early strength
-High durability
-High modulus of elasticity
-Toughness and impact resistance
-Volume stability.
-Ease of placement.
-Compaction without segregation.
CONTD…..

7. MATERIAL REQUIREMENT FOR HPC
Material Requirements
Cement -Portland Cement
Water -Potable tap water having pH 7.3.
Fine Aggregate -Sand with rounded particle shape.
-Higher FM(around 3)
Coarse Aggregate -Smaller maximum size(10-12 mm) is preferred.
-Angular and crushed with a minimum flat and elongated
particles
- Higher CA/FA ratio than that for normal strength concrete.
Admixtures
(chemical & mineral)
- Type of admixture depends on the property of the
concrete to be improved
- Optimum dosage
Overall basic
considerations
-Quality materials
- Improved quality of cement paste as well as aggregates
- Denser packing of aggregates and cement paste

8. HIGH STRENGTH CONCRETE MATERIAL
Material Primary Contribution
Portland Cement Cementing Material/Durability
Blended Cement
Cementing Material/Durability/High StrengthFly Ash/Slag/Silica Fume
Calcined Clay
Super plasticizer Flow ability
High range water reducer Reduce Water-cement ratio
Retarders Control setting
Accelerators Accelerate Setting
Corrosion inhibitors Control Steel corrosion
Polymer Durability

9. BENEFITS OF HPC
High Performance Concrete is a specialized series of concretes
designed to provide several benefits in the construction of
concrete structures:
Performance
Benefits
Cost and other
Benefits
Ease of placement Less material
Early High strength Reduced Maintenance
Seismic Resistant Extended Life Cycle
consolidation without
affecting strength
Effective Utilization of
Industrial Waste
Speed of Construction Improved Durability

10. APPLICATIONS
Bridges
High Rise Buildings
Tunnels
Pavements
Nuclear Structures