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Concrete Properties and Admixtures Quiz

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Questions and Answers

What happens to paste strength and stiffness as water/cement ratio (W/C) increases?

They decrease (correct)

They increase

They remain constant

They fluctuate

How does the shrinkage potential of concrete change with increasing water content?

Shrinkage potential increases (correct)

Shrinkage potential remains the same

Shrinkage potential decreases

Shrinkage potential fluctuates

How do larger concrete members affect the duration of shrinkage compared to smaller members?

The duration is shorter for larger members

The duration fluctuates based on member size

The duration is the same for all members

The duration is longer for larger members (correct)

What type of shrinkage occurs before concrete has set?

Plastic shrinkage (A) Signup and view all the answers

Which factor influences the rate of shrinkage in concrete?

Degree of compaction (B) Signup and view all the answers

What does concrete with a higher aggregate content exhibit in terms of shrinkage?

Smaller shrinkage (C) Signup and view all the answers

Which factor affects the resistance of concrete to the shrinkage process?

Aggregate roughness (D) Signup and view all the answers

What is the main purpose of using admixtures like accelerator, retarder, or plasticizer in concrete?

Adjust the setting time or improve workability of concrete (B) Signup and view all the answers

What happens to the deformation of concrete under sustained loading over time?

It increases slowly and then decreases as time passes (C) Signup and view all the answers

Why is achieving low permeability in concrete important?

To protect embedded steel against corrosion and increase durability (A) Signup and view all the answers

What are the factors influencing the permeability of concrete?

Water/Cement Ratio, Curing, and Strength Testing (A) Signup and view all the answers