High performance concrete
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Transcript of High performance concrete
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Group # 1
2013-BT-Civil-01 Muhammad Aamir
2013-BT-Civil-25 Suphvan Azhar
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HIGH PERFORMANCE CONCRETE
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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
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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.
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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.
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HPC
Concrete may be regarded as high
performance
for several reasons
High strength
High workability
High durability
Also improve visual appearance
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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.
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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
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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.
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HPC USED IN STRUCTURES
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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
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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.
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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.
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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
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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
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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.
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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
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REFERENCES
www.wikipedia.org
www.concreteproducts.com
Google images
www.docsto.com
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THANKS FOR YOUR ATTENTION
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