*HIGH PERFORMANCE CONCRETE

*SALIENT FEATURES OF HIGH PERFORMANCE CONCRETE

HIGH WORKABILITY

HIGH COMPRESSIVE STRENGTH

SEVERE ENVIRONMENT

COST

*DEFINITION

A CONCRETE WHICH MEETS SPECIAL PERFORMANCE AND UNIFORMITY REQUIREMENTS THAT CANNOT ALWAYS BE ACHIEVED ROUTINELY BY USING ONLY CONVENTIONAL MATERIALS AND NORMAL MIXING,PLACING AND CURING PRACTICES

*

SELECTION OF MATERIALS

SELECTION OF SUITABLE INGREDIENTS

DETERMINATION OF QUANTITIES

CAREFUL QUALITY CONTROL

*CEMENT

LITTLE AMOUNT OF C3A

FINELY GROUND

FAIR AMOUNT OF C3S

FINE AGGREGATES

RIVER SAND AND CRUSHED STONES

COARSER SAND

MINIMUM VOID RATIO

* COARSE AGGREGATE STRONGEST COMPONENT

SIZE NOT EXCEEDING 20MPa

CUBIC IN SHAPE

NOT FLAKY OR ELONGATED

*

IMPORTANT INGERDIENT

BINDING AGENT

EXCESS WATER IS UNDESIRABLE

WATER

*CHEMICAL ADMIXTURES

IMPROVE WORKABILITY

DECREASE IN WATER REQUIREMENT

TYPES OF CHEMICAL ADMIXTURES:

PLASTICIZERS SUPER PLASTICIZERS RETARDERS AIR ENTRAINING AGENTS

*

MINERAL ADMIXTURESCEMENT MATRIX-DENSER AND STRONGERTYPES OF MINERAL ADMIXTURES FLY ASH SILICA FUME CARBON BLACK POWDER ANHYDROUS GYPSUM BASED MINERAL ADMIXTURES

*

BEHAVIOUR OF FRESH HPC

WORKABILITY

VERY GOOD

PUMPED VERY WELL

WITHOUT SEGREGATION AND VOIDS

*SETTING TIME

DEPENDS ON APPLICATION

WATER REDUCING ADMIXTURES

*BEHAVIOUR OF HARDENED HPC

SHORT TERM PROPERTIES:

COMPRESSIVE STRENGTHTENSILE STRENGTH

LONG TERM PROPERTIES:

DURABILITY(POROSITY,PERMEABILITY,FREEZE-THAW RESISTANCE AND ABARASION RESISTANCE)CREEP AND SHRINKAGE

*STRENGTH

CONSTITUENT MATERIALS

METHOD OF TESTING

RATE OF LOADING

CURING TECHNIQUES

*COMPRESSIVE STRENGTH

28 DAYS STRENGTH UPTO 80 Mpa90 DAYS STRENGTH UPTO 130 MpaFUTURE-140MPa

*TENSILE STRENGTH

GOVERNS THE CRACKING BEHAVIOUR

DIRECT TENSILE TEST

SPLIT TENSILE TEST

*

DURABILITY CHARACTERISTICS

LOW PERMEABILITY

STEEL PROTECTED

ABRASION RESISTANCE

*

WHEN TO USE HPC

SEVERE EXPOSURE CONDITIONS

INCREASE DURABILITY

PREVENT DETERIORATION OF CONCRETE

*APPLICATIONS

BRIDGES

HIGH RISE BUILDINGS

TUNNELS

PAVEMENTS

NUCLEAR STRUCTURES

*CASE STUDY:JOIGNY BRIDGE

BUILT ACROSS RIVER YONNE

THREE SPAN BRIDGE

HEIGHT OF 220m

WIDTH OF 15.8m

FRENCH CODES

*REDUCTION IN CONCRETE VOLUME

28 DAYS STRENGTH OF 70MPa

PUMPING

SUFFICIENT SETTING TIME

*CONCRETE STRENGTH-91.7MPa AND 65.5MPaTENSILE STRENGTH-5.1MPaFIRST BRIDGE WITH 60MPaCOMPLETED IN 1989

*ADVANTAGESREDUCTION IN SIZE OF STRUCTURAL MEMBERSSPEED OF CONSTRUCTIONWORKABILITY AND PUMPABILITYECONOMICAL MATERIAL IN TERMS OF TIME AND MONEY

*HIGHER SEISMIC RESISTANCE

IMPROVED DURABILITY

ABRASION RESISTANCE

HIGH TENSILE STRENGTH

REDUCED MAINTENANCE COSTADVANTAGES(CONT..)

*LIMITATIONAN EXTENDED QUALITY CONTROL

COST SPECIAL CONSTITUENTS

MANUFACTURED AND PLACED CAREFULLY

*CONCLUSIONS

DURABILITY CONSIDERATIONS

INITIAL COST IS HIGH

REDUCED SIZE OF STRUCTURAL MEMBERS

PRECAST PRODUCTS

EFFECTIVE UTILIZATION OF INDUSTRIAL WASTES

*