high performance concrete ppt
TRANSCRIPT
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.