GOOD AFTERNOON

& WELCOME TO ALL

A Technical Seminar on

High Performance Concrete

MD TARIQUE JILANIUSN NO:2AB11ME038

Prof. JAYARAM BHATT

ANJUMAN ENGINEERING COLLEGE , DEPARTMENT OF CIVIL ENGINEERING

By

CONTENTS Introduction.

What is High Performance Concrete. ?

Components/Ingredients of HPC.

Methods for achieving High Performance

Characteristic of HPC.

Stress-strain Behavior

Advantages.

Disadvantages.

Application.

Case Study.

Conclusion.

References.

INTRODUCTION

Concrete is the most widely used construction material in India

with annual consumption exceeding 100 million cubic meters.

High performance concrete is a concrete in which certain

characteristics are developed for a particular application and

environment, so that it will give excellent performance in the

structure in which it will be placed.

A high-strength concrete is always a high performance concrete,

but a high-performance concrete is not always a high-strength

concrete.

What is High Performance Concrete ?

According to Paul Zia

HPC is a concrete, which meets special performance, and uniformity requirements that cannot be always achieved by using only the conventional materials and normal mixing, placing, and curing practices.

According to Civil Engineering Research Foundation (CERP)

HPC is a concrete in which some or all of the following properties

have been enhanced.

(a) Ease of placement

(b) Long term mechanical properties

(c) Early age strength

(d) Toughness

Components/Ingredients

The main ingredients of HPC are as follows

1) Cement

2) Fine aggregate

3) Coarse aggregate

4) Water

5) Mineral admixtures (fine filler and/or pozzolonic supplementary cementitious materials)

6) Chemical admixtures (plasticizers, superplasticizers, retarders, air-entraining agents)

Methods for achieving High Performance

Better durability performance has been achieved by using high-

strength, low w/c ratio concrete.

Two approaches to achieve durability through different techniques

are as follows

(1)Reducing the capillary pore system such that no fluid

movement can occur is the first approach. This is very difficult

to realize and all concrete will have some interconnected pores.

2. Creating chemically active binding sites which prevent

transport of aggressive ions such as chlorides is the second

more effective method. There are two approaches are shown

in Fig.1

Characteristics of High performance concrete.

Concrete may be regarded as high performance for several different reasons:

Very low porosity through a tight and refined pore structure of the cement paste.

Very low permeability of the concrete

High resistance to chemical attack.

Low heat of hydration

High early strength and continued strength development

Low water binder ratio

Low bleeding and plastic shrinkage

Stress-strain Behavior The shape of the ascending part of the stress-strain curve is more

linear and steeper for high-strength concrete, and the strain at the

maximum stress is slightly higher for HPC.

The slope of the descending part becomes steeper for high

performance concrete.

High performance concrete exhibits less internal micro cracking than

lower-strength concrete for a given imposed axial strain.

Advantages Speed Of Construction

Economical Material In terms Of Time And Money

Higher Seismic Resistance

Improved Durability

Abrasion Resistance

High Tensile Strength

Reduced

Maintenance Cost

Disadvantages

An Extended Quality Control

Cost

Special Constituents

Manufactured And Placed carefully

Application

In Pavements

High Performance concrete is being increasingly

used for highway pavements due to the potential

economic benefits

Fast track concrete paving (FTCP) technology can

be used for complete pavement reconstruction.

In Bridges

HPC is being extensively used now for the fabrication of precast

pylons, piers, and girders of many long span bridges in the world

For Example The Normandie Bridge in France (1993),

Concrete structures are preferable for railway bridges to

eliminate noise and vibration problems and minimize the

maintenance cost.

Fast track concrete paving (FTCP) technology can be used for

complete pavement reconstruction.

Application

In High-rise Buildings.

The reasons for using the high strength concrete in the area of

high-rise buildings are to reduce the dead load, the deflection,

the vibration and the noise, and the maintenance cost.

Application

Miscellaneous Applications.

Fiber reinforced concrete has been used with and without

conventional reinforcement in many field applications. These

include bridge deck overlays, floor slabs, pavements and pavement

overlays, refractories, hydraulic structures, thin shells, rock slope

stabilization, mine tunnel linings and many precast products.

Case Study

JOIGNY BRIDGE Built Across River Yonne

Three Span Bridge

Height Of 2.2m

Width Of 15.8m

French Codes

Features.

Concrete Strength- 91.7MPa AND 65.5MPa

Tensile Strength is 5.1MPa

FIRST BRIDGE WITH 60MPa

Completed In 1989

PETRONAS Tower

Nuclear Reactor France

LA GRANDE ARCHE, PARIS

THE GREAT HASSAN II MOSQUE,MOROCCO

Conclusion

We are going to expect concrete that is a little more expensive per

cubic meter to buy but

It will require less skill and effort to place.

It will look better with no appearance defects.

It will be more durable.

It will require more skill at the batching plant.

References

1. PHD Thesis of Dr. (Smt) B.K Shah on" High Performance, Eco-friendly Cement Using High Volume Industrial Byproducts and Waste Materials (IBPW)“

2. C.Suryawanshi,”Structural significance of high performance concrete”, Indian Concrete journal. (march2007).

3. M.S. Shetty, “ Concrete Technology- theory and practice”, S.CHAND publications,2013.

4. A.T. mullick, “High Performance Concrete in INDIA”, Indian concrète journal, (Sept-2005) pp 7-12.

5. IS 10262: 1982, “Recommended Guidelines for Concrete Mix design”, Bureau of Indian Standard, New Delhi.