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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?

Reaction of a solid aluminosilicate with a highly concentrated aqueous alkali hydroxide or silicate solution (A) Signup and view all the answers

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

R. Roy (A) Signup and view all the answers

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

Mixture of amorphous to semi-crystalline gel and crystalline Al-Si source materials (C) 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?

Geopolymers (B) Signup and view all the answers

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

To facilitate the leaching of Al-Si solid into paste (C) Signup and view all the answers

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

Improved refractoriness of the geopolymer (C) Signup and view all the answers

What is the temperature range for the curing of geopolymer?

60°C-120°C (C) Signup and view all the answers

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