high strength concrete
TRANSCRIPT
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By
K.Pranuthi-14011D9010
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ContentsIntroduction
Ingredients
Methods used for making HSC
Comparison Between HSC and HPC
Advantages
Applications
Conclusion
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Introduction
Concrete is defines as High-
Strength Concrete (HSC) only on
the basis of :
Compressive strength
At given age
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28 day Compressive Strength
• 1970’s 40MPa
• later 60-100MPa
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Ingredients of HSCCement
Sand
Water (Low Water -Cement Ratio)
Optimum sized aggregates (10mm
to 20mm)
Admixtures
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Admixtures Silica fume (To prevent Ca(OH)₂
crystals in cement matrix)
Water reducing agents (Super plasticizers)
Dosage rate 5% to 20% or higher by mass of cementing material.
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Methods for making HSC1. Seeding
2. Re-vibration
3. High Speed Slurry
4. Use of admixtures
5. Inhibition of Cracks
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6. Sulphur Impregnation
7. Use of Cementitious aggregates
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Comparison Between HSC and NSC
High Resistance to Applied
pressures compared to NSC
Water Cement Ratio is :
HSC - 0.25
NSC - 0.4 to 0.6
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Normal
Strength
20-50 MPa
High Strength 50-100 MPa
Ultra High
Strength
100-150 MPa
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Aggregate size are:HSC - 10 mm to 20mm
NSC - 40mm
Higher Modulus of Elasticity Lower creep coefficient Less deflectionFracture Surface
HSC – Smooth NSC - Rough
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AdvantagesReduces amount of Steel
Reduces Dead Load
Reduces space occupied by Columns.
Increases rental Space.
High Compressive Strength
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To use the concrete service at early age.
Eg :Pavement in 3 days
High rise buildings an be build by reduced columns.
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LimitationsDamaged at high temperature i.e less resistance to fire.
Must be expertise in selection of ingredients.
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ApplicationsLong Span Bridges : Vidya Sagar
Setu at Kolkata
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High Rise building : South Wacker Drive , Chicago
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Kaiga Power Project
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PetronasTowers,Malaysia
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Conclusion In recent years there has been a
rapid growth of interest in high
strength concrete.
We may use HSC more often in
future.
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Thank
you