High performance concrete

Group # 1

2013-BT-Civil-01 Muhammad Aamir

2013-BT-Civil-25 Suphvan Azhar

HIGH PERFORMANCE CONCRETE

CONTENTS

Introduction

Definition

History

Properties

Why HPC is important?

HPC used in structures

Setting time

Durability characteristics

When to use HPC?

Benefits

Types of HPC

Limitations

Conclusions

Question Answer Session

INTRODUCTION

High performance concrete is a concrete mixture, which

possess high durability and high strength when

compared to conventional concrete.

This concrete contains one or more of cementious

materials such as fly ash, Silica fume or ground

granulated blast furnace slag and usually a super

plasticizer. . The use of some mineral and chemical

admixtures like Silica fume and Super plasticizer

enhance the strength, durability and workability qualities

to a very high extent.

DEFINITION

Any concrete which satisfies certain criteriaproposed to overcome limitations ofconventional concrete may be called as highperformance concrete .

It may include concrete which provides eithersubstantially improved resistance toenvironmental influences OR substantiallyincreased structural capacity whilemaintaining adequate durability.

HPC

Concrete may be regarded as high

performance

for several reasons

High strength

High workability

High durability

Also improve visual appearance

HISTORY

During Roman empire Roman concrete was

made from quicklime, ash and an aggregate

of pumice. It quickly hardened into a rigid

mass, free from many of the internal thrusts

and strains which trouble the builders of

similar structures in stone or brick. Modern

tests show Roman concrete to be as strong

as modern Portland cement concrete.

PROPERTIES

Ease of placement

Compaction without segregation

Early age strength

Long term mechanical properties

Permeability

Density

Heat of hydration

Toughness

Volume stability

Long life in severe environments

WHY IS HPC IMPORTANT?

Concrete is the most widely used building material.

any improvement in the design of this material e.g.

cost, durability, or strength ripples through the

economy. HPC is a specialized series of concretes

designed to provide several benefits in construction

of concrete structure.

HPC USED IN STRUCTURES

SETTING TIME

Setting time can vary depending on the application

and the presence of set modifying admixtures and

percentage of the paste composed of Portland cement. The

use of large quantities of water reducing admixtures can

significantly extend setting time

DURABILITY CHARACTERISTICS

The most important property which distinguish HPC from

conventional concrete.

This is due to the refinement of pore structure of

microstructure of the cement concrete to achieve a very compact

material with very low permeability to ingress of water, air, oxygen,

chlorides, sulphates and other deleterious agents.

WHEN TO USE HPC

High Performance Concrete can be used in severe

exposure conditions where there is a danger to concrete by

chlorides or sulphates or other aggressive agents as they ensure

very low permeability.

PERFORMANCE BENEFITS COST& OTHER BENEFITS

Ease of placement and consolidation without affecting strength

Long term mechanical properties

Early high strength

Toughness

Volume stability

Longer life in severe environments

Less material

Fewer beams

Reduced maintenance

Extended life cycle

TYPES OF HPC

1. Toproc CR – Chemical Resistant concrete

2. Toproc ED – Early Drying concrete

3. Toproc UW – Ultra Water resistant concrete

4. Toproc HR – Heat Resistant concrete

5. Toproc SY – Impact and abrasion resistance

LIMITATIONS

Concrete can be damaged at very high temperature.

High Performance Concrete has to be manufactured much more carefully than normal concrete.

An extended quality control is required

In concrete plant and at delivery site, additional tests are required. This increases the cost

Some special constituents are required which may not be available in the ready mix concrete plants.

CONCLUSION

HPC become a crucial element of the viability of

tall buildings in the region

High strength to reduce the size of sections

High durability makes it much important

It enhance visual effect

It can bear severe environments

REFERENCES

www.wikipedia.org

www.concreteproducts.com

Google images

www.docsto.com

THANKS FOR YOUR ATTENTION