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Describe the pozzolanic reaction. Name two types of pozzolans. Give one advantage and one
disadvantage by replacing part of the cement with pozzolan in the concrete?
Solution
Pozzolanic reaction is manily occured by the addition of pozzolans. Generally pozzolans are fly
ash, gypsum, laterite, iron ore mixing with limestone and silica in varying percentage.
Chemical reaction
Ca(OH) 2 + H 4 SiO 4 = CaH 2 SiO 4 .2H 2 O
Types of pozzolans used are
1. Fly ash : Function of flyash increases the strength of cement.
2 .Rice hull Ash
3. Silica flume
Advantage:
1. Increases the strength and reduces the permeability.
Disadvantage:
1. As the high carbon content in pozzolan which results in use of more water and darken the
concrete.
Describe the pozzolanic reaction- Name two types of pozzolans- Give on.docx

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Describe the pozzolanic reaction- Name two types of pozzolans- Give on.docx

  • 1. Describe the pozzolanic reaction. Name two types of pozzolans. Give one advantage and one disadvantage by replacing part of the cement with pozzolan in the concrete? Solution Pozzolanic reaction is manily occured by the addition of pozzolans. Generally pozzolans are fly ash, gypsum, laterite, iron ore mixing with limestone and silica in varying percentage. Chemical reaction Ca(OH) 2 + H 4 SiO 4 = CaH 2 SiO 4 .2H 2 O Types of pozzolans used are 1. Fly ash : Function of flyash increases the strength of cement. 2 .Rice hull Ash 3. Silica flume Advantage: 1. Increases the strength and reduces the permeability. Disadvantage: 1. As the high carbon content in pozzolan which results in use of more water and darken the concrete.