Practice Pozzolanic Reaction Mechanism (6.12.1) - Mineral Admixtures

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6 sample questions

Question 1.
What is a pozzolanic reaction?
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Think about how admixtures improve concrete.
Question 2.
Name one benefit of C-S-H in concrete.
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Consider the strength-giving compound.
3Question 3.
What do pozzolanic materials react with to enhance concrete?
- Water
- Calcium Hydroxide
- Cement
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Recall the main reaction in pozzolanic processes.
4Question 4.
True or False: The main benefit of the pozzolanic reaction is the reduction of permeability.
- True
- False
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Think about how the microstructure changes.
Question 5.
A concrete mixture uses 500 kg of cement. If 30% of this is replaced with GGBS, calculate how much GGBS is used. Discuss the implications of this replacement on hydration heat.
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Apply percentage calculations.
Question 6.
Predict how the permeability of concrete could change when 20% of the cement is replaced with a highly reactive pozzolan compared to normal cement hydration.
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Consider the properties of C-S-H versus Ca(OH)₂.

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