geopolymer concrete
TRANSCRIPT
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Geopolymer Concrete for Green Construction Materials(Without
Cement)
Engr.Arivusudar Nagarajan Engr.Arivusudar Nagarajan Special concrete products Special concrete products
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What’s wrong with cement concrete?
• Many concrete structures deteriorate after 20 years.
• Cement production releases high amounts of CO2 to the atmosphere(1tonne of cement production releases 1tonne of CO2) thus contributing to 7% of world CO2 emissions.
• Cement is one of the most energy intensive material.
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How to reduce the use of cement
• Partially replace the use of cement in concrete.example: high volume fly ash concrete
• Develop alternate materials.example:Geopolymer concrete
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Geopolymer Concrete• Hardened cementitious paste made from
flyash and alkaline solution.• Combines waste products into useful
product.• Setting mechanism depends on
polymerization.• Curing temp is between 60-90 degree
celcious.
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CONSTITUENTS OF GEOPOLYMER CONCRETE
• Source materials : alumina-silicate
Alkaline liquids combination of sodium hydroxide
(NaOH) or potassium hydroxide (KOH) and sodium silicate or potassium silicate.
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Preparation of geopolymer concrete
GeopolymerisationStorag
e
Aggregate
Fly ashAlkaline activatorNaOH + Na Silicate
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MANUFACTURE OF GEOPOLYMER CONCRETE
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The aggregates are prepared in saturated-surface-dry (SSD) condition, and are kept in plastic buckets with lid
Dry Materials of Geopolymer Concrete
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The fly ash and the aggregates are first mixed together dry in 80-litre capacity pan mixer
. Pan Mixer Used in the Manufacture of Geopolymer Concrete
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The liquid component of the mixture is then added to the dry materials and the mixing continued
usually for another four minutes
Addition of Liquid Component
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The fresh concrete could be handled up to 120 minutes without any sign of setting and without any degradation in
the compressive strength
Fresh Geopolymer Concrete Ready for Placing
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The workability of the fresh concrete was measured by means of the conventional slump test
Slump Measurement of Fresh Geopolymer Concrete
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Boundary between Geopolymer binder , aggregate and reinforcement
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ADVANTAGES
Cutting the world’s carbon.The price of fly ash is low. Better compressive strength.Fire proof.Low permeability.Eco-friendly.Excellent properties within both acid and salt
environments.
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• Different source materials• Properties of soluble silicate• Contaminants• Industry regulations• New material
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Research Context and Prior Work• During the year 2014-15, the per capita electricity generation in India was 1,010
kWh with total electricity consumption (utilities and non utilities) of 938.823 billion or 746 kWh per capita electricity consumption.
• The utilization of fly ash has increased from 6.64 million ton in 1996-97 to a level of 102.54 million-ton in 2014-15.
• Cement Production (179.9 mn tonnes – 2011) , CO2 emissions 167.Mt • Cement production contributes 7% of human CO2 emissions• Cement production - energy intensive process (heat raw materials to 2550 F)
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Re-Arranging the Equation
Power Generation Refinery/Chemical industryCement Production
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Re-Arranging the Equation
+
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Conclusion The reduced CO2 emissions of Geopolymer cements make
them a good alternative to Ordinary Portland Cement.
Produces a substance that is comparable to or better than traditional cements with respect to most properties.
Geopolymer concrete has excellent properties within both acid and salt environments
Low-calcium fly ash-based geopolymer concrete has excellent compressive strength and is suitable for Structural applications.
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