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Geopolymer concrete


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Geopolymer concrete

  1. 4. Geopolymer Concrete <ul><li>Hardened cementitious paste made from flyash and alkaline solution. </li></ul><ul><li>Combines waste products into useful product. </li></ul><ul><li>Setting mechanism depends on polymerization. </li></ul><ul><li>Curing temp is between 60-90 degree celcious. </li></ul>
  2. 5. CONSTITUENTS OF GEOPOLYMER CONCRETE <ul><li>Source materials : </li></ul><ul><ul><ul><ul><ul><li>alumina-silicate </li></ul></ul></ul></ul></ul><ul><li>Alkaline liquids </li></ul><ul><ul><ul><ul><ul><li>combination of sodium hydroxide (NaOH) or potassium hydroxide (KOH) and sodium silicate or potassium silicate. </li></ul></ul></ul></ul></ul>
  3. 6. Preparation of geopolymer concrete Geopolymerisation Storage Aggregate Fly ash Alkaline activator NaOH + Na Silicate
  5. 9. The aggregates are prepared in saturated-surface-dry (SSD) condition, and are kept in plastic buckets with lid Dry Materials of Geopolymer Concrete
  6. 10. 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
  7. 11. The liquid component of the mixture is then added to the dry materials and the mixing continued usually for another four minutes <ul><li>Addition of Liquid Component </li></ul>
  8. 12. The fresh concrete could be handled up to 120 minutes without any sign of setting and without any degradation in the compressive strength <ul><li>Fresh Geopolymer Concrete Ready for Placing </li></ul>
  9. 13. The workability of the fresh concrete was measured by means of the conventional slump test Slump Measurement of Fresh Geopolymer Concrete
  10. 14. Boundary between Geopolymer binder , aggregate and reinforcement
  11. 15. ADVANTAGES <ul><li>Cutting the world’s carbon. </li></ul><ul><li>The price of fly ash is low. </li></ul><ul><li>Better compressive strength. </li></ul><ul><li>Fire proof. </li></ul><ul><li>Low permeability. </li></ul><ul><li>Eco-friendly. </li></ul><ul><li>Excellent properties within both acid and salt environments. </li></ul>
  12. 17. <ul><li>Different source materials </li></ul><ul><li>Properties of soluble silicate </li></ul><ul><li>Contaminants </li></ul><ul><li>Industry regulations </li></ul><ul><li>New material </li></ul>
  13. 18. <ul><li>The reduced CO 2 emissions of Geopolymer cements make them a good alternative to Ordinary Portland Cement. </li></ul><ul><li>Produces a substance that is comparable to or better than traditional cements with respect to most properties. </li></ul><ul><li>Geopolymer concrete has excellent properties within both acid and salt environments </li></ul><ul><li>Low-calcium fly ash-based geopolymer concrete has excellent compressive strength and is suitable for Structural applications. </li></ul>
  14. 19. Thank You For more Paper Presentations on Civil Engineering topics visit the following site..