Concrete degradation

Concrete degradation

University - Professional Development

5 Qs

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Concrete degradation

Concrete degradation

Assessment

Quiz

Professional Development

University - Professional Development

Medium

Created by

Yu Yuen

Used 9+ times

FREE Resource

5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Proper moisture curing leads to formation of more C-S-H crystals (not expansive) in the pores of the hardened cement paste. Will it be harmful (cause cracking) to concrete?

Yes

No

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sulfate attack leads to the formation of more ettringite crystals (expansive/size grow) in the pores of the hardened cement paste. Will it be harmful (cause cracking) to concrete?

Yes

No

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The use of sea sand with a high concentration of salt can lead to the degradation of reinforced concrete. What is the main reason?

Salt damage the cement paste structure

Ettringite formation

Corrosion of steel (leads to formation of expansive crytsal)

Decrease the pH value in concrete

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the natural pH environment of concrete?

acidic (pH <7)

alkaline (pH >7)

neutral (pH = 7)

I don't know

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Cement hydration is a heat-releasing reaction. Which one of the following methods cannot prevent thermal cracking in mass concrete construction?

Use ice water

Low heat cement (with cement partially replaced by pozzolans)

Use retarder (reduce the reaction rate and make the setting time longer)

Cover the concrete surface with a plastic film