Practice Alkali-aggregate Reaction (aar) (2.9) - Cement Chemistry

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9 questions

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2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What materials in cement can cause AAR?
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Think about the chemical components of cement.
Question 2.
What is the outcome of AAR on concrete?
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Consider the pressures that might build up.
3Question 3.
What causes the expansion in AAR?
- Alkali reaction with calcium
- Alkali reaction with silica
- Alkali reaction with air
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Consider which materials in cement are reactive.
4Question 4.
True or False: AAR can lead to cracking in concrete.
- True
- False
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Think about the implications of material expansion.
Question 5.
Given a scenario where a newly constructed pavement begins to crack after a rainy season, analyze the potential causes and propose solutions.
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Think about how weather influences chemical reactions!
Question 6.
Assuming you have a concrete design specification, outline the concrete mix considering AAR implications.
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What materials help mitigate alkalis?

5 more questions in this section. Enroll free to practise them all.