Concrete Technology Questions and Answers – Permeability

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Permeability”.

1. The addition of a pozzolanic admixture such as fly ash reduces the ____________
a) C₃S
b) C₃A
c) C₂S
d) C₄AF
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2. Lowering of ____________ might also help, since this would reduce the amount of CH that forms.
a) C₃S
b) C₃A
c) C₂S
d) C₄AF
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3. When the ____________ content is low, most ettringite will be formed in the plastic state.
a) C₃SS
b) C₃AA
c) C₂S
d) C₄AF
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4. The philosophy of prescribing low ____________ cement to improve resistance to sulphate attack.
a) C₃S
b) C₃A
c) C₂S
d) C₄AF
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5. The quality of concrete, specifically a ____________ permeability, is the best protection against sulphate attack.
a) High
b) Medium
c) Low
d) Very low
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6. For concrete exposed to a very aggressive environment the w/c should be lower than __________
a) 1
b) .5
c) .4
d) .8
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7. The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack.
a) High
b) Medium
c) Low
d) Very low
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8. The quality of concrete, specifically a ____________ cement content, is the best protection against sulphate attack.
a) High
b) Medium
c) Low
d) Very low
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9. Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.
a) <150
b) 150-1500
c) 150-10000
d) >10000
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10. Concentration of water-soluble sulphates in water ___________ ppm for severe exposure.
a) <150
b) 150-1500
c) 150-10000
d) >10000
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Sanfoundry Global Education & Learning Series – Concrete Technology.

To practice all areas of Concrete Technology, here is complete set of 1000+ Multiple Choice Questions and Answers.