7/31/2019 High-performance Concrete Finale
1/15
HIGH-PERFORMANCE CONCRETE
7/31/2019 High-performance Concrete Finale
2/15
Topics
7/31/2019 High-performance Concrete Finale
3/15
Introductions Latest demands regarding reinforced concrete
structures, with ever expansion in height and length,require the use of concrete with superior physical andmechanical properties. The use of high performance
concrete for reinforced concrete structures meets therequirements, with several advantages in terms ofcost and slenderness. The durability of high strengthconcrete is also extremely beneficial in a long term
analysis.
7/31/2019 High-performance Concrete Finale
4/15
Definitions ACI (American Concrete Institute)defined high-
performance concrete as a concrete meeting specialcombinations of performance and uniformityrequirements that cannot always be achieved routinely
using conventional constituents and normal mixing,placing, and curing practice.
7/31/2019 High-performance Concrete Finale
5/15
7/31/2019 High-performance Concrete Finale
6/15
Burj Khalifa BuildingNew Benicia-Martinez Bridge
High-performance concrete
7/31/2019 High-performance Concrete Finale
7/15
High-performance concretecharacteristics High strength High early strength
High modulus of elasticity
High abrasion resistance
High durability and long life in severe environments
Low permeability and diffusion
Resistance to chemical attack
High resistance to frost and deicer scaling damage
Toughness and impact resistance
Volume stability Ease of placement
Compaction without segregation Inhibition of bacterial and mold growth
7/31/2019 High-performance Concrete Finale
8/15
Characteristics that may be
considered critical for
particular application Ease of placement
Compaction without segregation
Early age strength &Long-term strength andmechanical properties
Permeability
Heat of hydration Long life in severe environments Note: according to the ACI definition, durability under severe environmental conditions is an
optional, not a mandatory requirement for HPC.
7/31/2019 High-performance Concrete Finale
9/15
Material Used in HPCMaterial Primary
contribution/Desiredproperty
Portland cement Cementing material/durability
Blended cement Cementingmaterial/durability/highstrength
Fly ash or Silica fume Cementingmaterial/durability/highstrength
Admixture Ari Entraining
Chemical AdmixtureMineral Admixture
Optimally graded aggregate Work ability /Reduce pastedemand
Polymer/latex modifiers Durability
7/31/2019 High-performance Concrete Finale
10/15
HSC compare to Normal ConcreteFlowability/Pumpability EasierWorkability/Compactability EasierBleeding None or NegligibleFinishing QuickerSetting Time Slower up to 2 hEarly Strength (up to 7-day) Lower but can be acceleratedUltimate Strength- 90day +
Higher
Crack Resistance Plastic Shrinkage Thermal Shrinkage Lower Drying Shrinkage
HigherHigher (If unprotected)LowerLower
7/31/2019 High-performance Concrete Finale
11/15
HSC compare to Normal Concrete(continue)Resistance to Penetration of Chloride Ions Very high after 3 monthsElectrical Resistivity Very high after 3 monthsDurability Resistance to Sulfate Attack
Resistance to Alkali-Silica Expansion Resistance to Reinforcement Corrosion
Very high
Very highHigh
Cost Materials Labor Life Cycle
LowerSimilarVery low
Environmental Benefits ( Reduced CO2 emission) Very high
7/31/2019 High-performance Concrete Finale
12/15
7/31/2019 High-performance Concrete Finale
13/15
Example of building Off-shore
Oil drilling platform
Long span bridge
Bridge-deck Pavements
Parking Structure
7/31/2019 High-performance Concrete Finale
14/15
Conclusion The application of new superplastizicer and powders in
high performance concrete give the opportunity toproduce self-compacting concretes that easily reach acompressive strength of more than 150 MPa. These
concretes show a very good workability in the fresh state,also the hardened concrete shows excellent quality.Future interests will try to reduce autogenous shrinkage tominimize the crack tendency of the young concrete.Further investigations to optimize the mix proportions willaim to the application of this concrete on site.
7/31/2019 High-performance Concrete Finale
15/15
Reference