Concrete Degradation Quiz

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Questions and Answers

Which type of attack can lead to the production of calcium sulfo-aluminate (Ettringite) and subsequently cause a decrease in volume and cracking?

Acid attack
Alkali-aggregate reaction
Corrosion of reinforcement
Sulfate attack (correct)

In which type of exposure does sea water containing sulfate pose a moderate threat?

Corrosion of reinforcement
Sulfate exposure (correct)
Acid attack
Alkali-aggregate reaction

What can lead to the production of acids in damp conditions, particularly in chimneys and some agricultural conditions?

Corrosion of reinforcement
Reacting SO2 and CO2 (correct)
Sulfate attack
Alkali-aggregate reaction

Which process prevents the corrosion of reinforcement?

Ca(OH)2 (D) Signup and view all the answers

What is the main cause of chemical attack on concrete?

Acid in the environment (D) Signup and view all the answers

What is the effect of alkali-aggregate reaction on concrete?

Volume expansion and cracking (A) Signup and view all the answers

What is the definition of permeability with respect to concrete?

Case with which liquids or gases can travel through concrete (D) Signup and view all the answers

Which type of exposure poses a moderate threat due to sea water containing sulfate?

Chemical attack by sea water (D) Signup and view all the answers

Flashcards

Sulfate attack

A chemical reaction that happens when sulfate ions in the environment attack concrete, leading to the formation of a mineral called ettringite. This mineral grows and expands, causing the concrete to weaken and crack.

Sulfate exposure

Exposure to sulfate ions, found in sea water, can cause a moderate degree of damage to concrete.

How acids form in concrete

When sulfur dioxide (SO2) and carbon dioxide (CO2) react in damp conditions, like chimneys or farm areas, they can form acids.

How concrete protects steel

Calcium Hydroxide (Ca(OH)2) is a natural component of concrete that helps protect the steel reinforcement from corrosion.

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Chemical attack on concrete

Acidic substances in the environment can react with and weaken concrete, leading to damage and deterioration.

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Alkali-aggregate reaction

The reaction between certain types of aggregates (like some rocks) and the alkaline environment in concrete can cause the concrete to expand and crack.

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