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Geopolymers: Synthesis and Applications
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Geopolymers: Synthesis and Applications

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Questions and Answers

What is the primary consolidation mechanism of chemically bonded ceramics?

  • Sintering
  • Chemical reactions (correct)
  • Hydrogen bonds
  • Thermal treatments

    • What is the temperature range for the consolidation of alkali bonded ceramics?

  • 2000°C-2500°C
  • 1000°C-1200°C
  • RT-120°C (correct)
  • 500°C-600°C

    • What type of bonding is responsible for the corrosion resistance in ceramics?

  • Van der Waals forces
  • Hydrogen bonds
  • Alkali bonding
  • Ionic and covalent bonding (correct)

    • What is the reaction that produces a geopolymer material?

    <p>Reaction of a solid aluminosilicate with a highly concentrated aqueous alkali hydroxide or silicate solution</p> Signup and view all the answers

    What is the name of the scientist who first defined chemically bonded ceramics?

    <p>R. Roy</p> Signup and view all the answers

    What is the characteristic of geopolymer structure in the early stage of reaction?

    <p>Mixture of amorphous to semi-crystalline gel and crystalline Al-Si source materials</p> Signup and view all the answers

    What is the term used to describe a wide variety of matrices or composite materials with limited restrictions on their composition and Al-Si content?

    <p>Geopolymers</p> Signup and view all the answers

    What is the purpose of the alkaline activator in the geopolymerization process?

    <p>To facilitate the leaching of Al-Si solid into paste</p> Signup and view all the answers

    What is the result of the high reactivity of metakaolin-based nano-precipitates?

    <p>Improved refractoriness of the geopolymer</p> Signup and view all the answers

    What is the temperature range for the curing of geopolymer?

    <p>60°C-120°C</p> Signup and view all the answers

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