Practice Moisture Corrections (11) - Objectives of Mix Design - Civil Engineering Materials, Testing & Evaluation - Vol 2

Practice: Moisture Corrections

Lesson 11Objectives of Mix Design

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9 questions

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3 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 is free surface moisture?
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Think about what happens when aggregates are exposed to water.
Question 2.
How does absorption capacity affect water content?
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Consider what absorbing water means for the aggregates.
3Question 3.
What is the effect of free surface moisture on the water-cement ratio?
- It decreases the water content
- It increases the effective water content
- No effect
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Think about what happens when unnecessary water is added.
4Question 4.
True or False: Absorption capacity of aggregates increases the amount of effective water available in a mix.
- True
- False
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Why would absorbing water take it away from the mix?
Question 5.
You have 800 kg of aggregates with 2% absorption. Calculate the reduced water content that needs to be adjusted in your mix.
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Think about how absorption affects the total available water.
Question 6.
If aggregates have 5% free surface moisture and your planned mix requires 200 kg of water, how much total water should you adjust for?
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Remember, free surface moisture adds to our planned amounts.

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