HIGH PERFORMANCE CONRCETE

High-Performance Concrete Definition:- HPC is a concrete that has been designed to be more durable and if necessary, stronger than conventional concrete. HPC mixtures are essentially composed of the same materials as conventional concrete mixtures. But the proportions are designed or engineered to provide the strength and durability needed for the structural and environmental requirements of the project.

High-Value Concrete High value generally associated with High-Performance. What is High-Performance? High-Early Strength Concrete High-Strength Concrete High-Durability Concrete Self-Consolidating Concrete High density concrete.

Characteristics of High-Performance Concrete High early strength High strength High modulus of elasticity High abrasion resistance High durability and long life in surrounding environments Low permeability Resistance to chemical attack

Characteristics of High-Performance Concrete High resistance to frost damage Toughness and impact resistance Volume stability Ease of placement Compaction without segregation Inhibition of bacterias.

Materials Used in High- Performance Concrete Primary Contribution/Desired Property Portland cement Cementing material / Durability Blended cement Fly ash / Slag / Silica fume Cementing material / Durability / High strength Superplasticizers Flowability High-range water reducers Reduce water-cement ratio Hydration control admix. Control setting

Materials Used in High- Performance Concrete 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 Optimally graded aggr. Improve workability/reduce paste Polymer Durability

Selected Properties of High- Performance Concrete Property Criteria that may be specified High Strength 70-140 MPa @ 28 to 91 days High early Comp. Strength 20-30 MPa @ 3-12 hrs or 1-3 days High early Flexural Strength 2-4 MPa @ 3-12 hrs or 1-3 days Low Absorption 2% to 5% Abrasion Resistance 0-1 mm depth of wear

High- Performance Concrete used for - Long Span Bridges Bridge-decks, Pavements, and Parking Structures Skyscrapers buildings

High- Performance Concrete J.J Flyover at Mumbai where High Performance concrete 75MPa was used for the first time in INDIA in 2002

High- Performance Concrete Some well known structures where High Performance Concrete is used Two Prudential Plaza CHICAGO 1989 Strength-82.7MPa Height of building -300m

High- Performance Concrete 311 South Wacker Drive Chicgo 1989 Strength-82.7MPa Height of building -300m

High- Performance Concrete Society Centert Cleveland 1991 Strength-82.7MPa Height of building -250m

High- Performance Concrete Trump Palace New York City 1991 Strength-82.2MPa Height of Buiding-200m

High- Performance Concrete Dain Bosworth Tower Minneapolis 1991 Strength – 96.5MPa Height of Building- 175m

High- Performance Concrete 225 West Wacker Drive Chicago 1988 Strength – 96.5MPa Height of Building – 100m

High- Performance Concrete Gateway Tower Seattle 1990 Strength -117.2MPa Height of Building -225m

High- Performance Concrete Two Union Square Seattle 1988 Strength - 131MPa Height of Building-250m

About HPC …….. 1. High Performance Concrete The American Concrete Institute (ACI) defines high-performance concrete as concrete meeting special combinations of performance and uniformity requirements that cannot always be achieved routinely when using conventional constituents and normal mixing, placing and curing practices. A high-performance concrete is something which demands much higher performance from concrete as compared to performance expected from routine concrete.

2. Typical performance parameters of High-Performance Concrete:- 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 Modulus of Elasticity Shrinkage Abrasion Creep Specification for High Performance Concrete often requires the concrete to meet several criteria.

3. Degree of quality control requirement for High Performance Concrete:- High-performance concretes are also more sensitive to changes in constituent material properties than conventional concretes. This means that a greater degree of quality control is required for the successful production of high-performance concrete. 4. High Performance Concrete obtained in practice:- By careful selection of raw materials (including chemical/mineral admixtures) & appropriate mix design to achieve the desired performance objectives. Most high-performance concretes have a high cementitious content and a water-cementitious material ratio of 0.40 or less.

5.Benefits 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 Cost & Other Benefits ease of placement and consolidation without affecting strength early high strength toughness volume stability longer life in surrounding environments less material reduced maintenance extended life cycle aesthetics

Conclusion :- It is best for use as it gives best properties but HPC becomes uneconomical for ordinary use. Hence we conclude that , this type of concrete can be used for all Important structures where high values are necessary.

Thank You