
lecture 8
Quiz
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Other
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University
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Practice Problem
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Hard
Scarlett Smith
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22 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main cause of D-cracking in concrete?
More rapid freezing rate
Increased porosity
Non-frost resistant coarse aggregate
Increased moisture saturation
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the most common form of freeze-thaw damage in concrete?
Spalling
D-cracking
Surface scaling
Paste failure
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can concrete be protected from freeze-thaw damage?
Increase porosity
Reduce capillary porosity
Use non-durable aggregate
Keep concrete dry
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of air entrainment in concrete?
Increase moisture saturation
Protect the matrix from freeze-thaw damage
Reduce capillary porosity
Increase freezing rate
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the critical factor that determines concrete deterioration in freezing-thawing sequence?
Strength development
Air spacing
Water content
Aggregate type
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main mechanism of freeze-thaw damage in concrete?
Internal micro-cracking
Surface scaling
Paste failure
Aggregate failure
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main contribution of voids to freeze-thaw damage in concrete?
Increased freezing rate
Increased number of cycles
Increased moisture saturation
Increased porosity
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