PRESENTED BYAVIK BHATTACHARJEE

GUIDED BY- Mrs.BIJOLI MONDAL (A.P)DEPARTMENT OF CIVIL ENGINEERING

ROLL-09103013001 HALDIA INSTITUTE OF TECHNOLOGY

HIGH PERFORMANCE CONCRETE

INTRODUCTION TO HIGH PERFORMANCE CONCRETE

High performance concrete (HPC) has been defined as concrete that which possesses high workability, high strength and high durability. ACI (American Concrete Institute) has defined HPC as a concrete in which certain characteristics are developed for a particular application and environment.

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The High Performance Concrete is normally designed for parameters (one or more) falling under the Strength criterion or/and under the

Durability criterion, as tabulated below:

STRENGTH CRITERIA DURABILITY CRITERIA

Compressive Strength Freeze-Thaw

Modulus of Elasticity Scaling

Shrinkage Abrasion

Creep Chloride Permeability

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SOME OF THE MAIN CHARACTERISTICS OF HIGH PERFORMANCE CONCRETE

ARE:

High early strength

High strength

High modulus of elasticity

High abrasion resistance

High durability and long life in severe environments

Low permeability and diffusion

Resistance to chemical attack

Toughness and impact resistance

Volume stability

Ease of placement

Compaction without segregation

Inhibition of bacterial and mold growth

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MATERIALS USED IN HIGH PERFORMANCE CONCRETE

MATERIAL PRIMARY CONTRIBUTION/DESIRED PROPERTY

Portland cement Cementing material / Durability

Blended cement Cementing material /

Durability /

High strength

Fly ash / Slag / Silica fume

Calcined clay/ Metakaolin

Calcined shale

Superplasticizers Flowability

High-range water reducers Reduce water-cement ratio

Hydration control admix. Control setting

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MATERIAL PRIMARY CONTRIBUTION/DESIRED PROPERTY

Retarders Control setting

Accelerators Accelerate setting

Corrosion inhibitors Control steel corrosion

Water reducers Reduce cement and water content

Shrinkage reducers Reduce shrinkage

ASR inhibitors Control alkali-silica activity

Optimally graded aggregate Improve workability/reduce paste

Polymer/latex modifiers Durability

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TYPES OF HIGH PERFORMANCE CONCRETE

• High workability concrete• Light weight concrete• High strength concrete• Sprayed concrete• Roller concrete

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HIGH WORKABILITY CONCRETE The workability of fresh concrete should be suitable for each

specific application to ensure that the operations of handling, placing and compaction can be undertaken efficiently. The handling and placing properties of concrete mixes can be improved considerably by the use of cement replacement materials such as pulverized fuel ash or ground granulated blastfurnace slag. Furthermore, the use of admixtures such as water reducers and superplasticisers have beneficial effects on workability without compromising other concrete properties.

They are especially suitable in the following applications: Inaccessible locations Large flat areas Underwater applications Pumping concrete over long distances

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TYPES OF HIGH WORKABILITY CONCRETE

• Self-compacting concrete• Foamed Concrete

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LIGHT WEIGHT CONCRETELightweight concretes can either be Lightweight Aggregate concrete, Foamed concrete or Autoclaved Aerated concrete (AAC). Such lightweight concrete blocks are often used in house construction.

HIGH STRENGTH CONCRETEThe definition of high strength concretes is continually developing. In the 1950s, 34MPa was considered high strength, and in the 1960s compressive strengths of up to 52MPa were being used commercially. More recently, compressive strengths approaching 138MPa have been used in cast-in-place buildings.High-strength concrete columns can hold more weight and therefore be made slimmer than regular strength concrete columns, which allows for more usable space, especially in the lower floors of buildings.

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SPRAYED CONCRETE There are many applications where traditional formwork is not a

suitable method of supporting concrete ,so sprayed concretes can be used.

These applications include:Shell roofs and domesRetaining wallsDiaphragm wallsBlast proof structuresBank vaultsUnderground ConstructionTunnel liningsSea and river wallsReservoirs and dams

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ROLLER COMPACTED CONCRETE Roller compacted concrete, a durable paving material that carries heavy loads. It is

now developing as a fast, economical construction method for dams, off-highway pavement projects, heavy-duty parking and storage areas, and as a base for conventional pavement. It is a stiff, no-slump concrete mixture comprising of local aggregates or crushed recycled concrete, portland cement, and water. The mixture is placed and roller compacted with the same commonly available equipment used for asphalt pavement construction. The process requires no forms, finishing, surface texturing, or joint sawing and sealing.

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EXAMPLES OF APPLICATION IN INDIA

1. BANDRA-WROLI SEA LINK

M60 grade performance concrete for superstructure was specified Target 28-days compressive srength-74N/mm² Slump obtained was 120mm and 28-day compressive strength in

the field was 75.16N/mm²

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• M7O grade was supplied from a readymade mix concrete plant, Target strength-83.2Mpa

• Slump required was 130 to 180 mm• Field strength obtained were –79.6Mpa at 28 days and 94

Mpa at 365days.

2. JJ FLYOVER, MUMBAI

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INTERNATIONAL APPLICATION OF HIGH PERFORMANCE CONCRETE

• THE CONFEDERATION BRIDGE IN CANADA (1997)

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ADVANTAGES OF HIGH PERFORMANCE CONCRETE

High Performance Concrete (HPC) is designed to provide several benefits in the construction of concrete structures as tabulated below:

PERFORMANCE BENEFITS

Ease of placement and consolidation without affecting strength

Long-term mechanical properties

Early high strength

Toughness

Volume stability

Longer life in severe environments

COST & OTHER BENEFITS

Less material

Fewer beams

Reduced maintenance

Extended life cycle

Aesthetics

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THANK YOU