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Professional Development
University -
Professional Development
Concrete degradation
5 questions
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- 1. Multiple Choice
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
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
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
What is the natural pH environment of concrete?
acidic (pH <7)
alkaline (pH >7)
neutral (pH = 7)
I don't know
- 5. Multiple Choice
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
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