Test Your Knowledge on the Use and Effects of Admixtures in Concrete

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Questions and Answers

What are admixtures in concrete used for?

To increase the water content of concrete
To modify the properties of fresh or hardened concrete (correct)
To replace fine aggregates
To change the color of concrete

What is the primary benefit of using admixtures in concrete?

They make concrete easier to transport
They make concrete more resistant to fire
They make concrete less expensive
They improve the consistency of concrete strength (correct)

What are admixtures added to concrete, mortar or paste for?

To make them less expensive
To strengthen their properties (correct)
To change their color
To weaken their properties

What is the purpose of adding admixtures to concrete, mortar or paste?

To modify their properties (C) Signup and view all the answers

Which type of admixture is most commonly used in advanced countries?

Super-plasticizers (C) Signup and view all the answers

When can admixtures be added to concrete?

Both during the mixing stage and the grinding stage of cement manufacturing (D) Signup and view all the answers

Which type of admixture is commonly used as a water reducer?

Super-plasticizers (B) Signup and view all the answers

What are the most common chemical admixtures?

Plasticizers and water reducers (A) Signup and view all the answers

When are admixtures necessary?

When strict design requirements need to be observed or when concrete needs to be transported over large distances or to great heights (B) Signup and view all the answers

When are admixtures considered necessary for concrete?

When strict design requirements need to be observed (B) Signup and view all the answers

Which of the following is NOT a component of concrete?

Admixtures (A) Signup and view all the answers

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Study Notes

Admixtures have been used in concrete for a long time.
Water reducers or plasticizers and superplasticizers are recent types of admixtures.
Plasticizers were not popular in India until the 1980s due to lack of awareness and education.
Indian companies started manufacturing chemical admixtures in collaboration with international companies.
The use of admixtures has been promoted by the use of ready mix concrete in recent times.
The effect of admixtures can be difficult to predict due to various factors.
Change in cement brand, aggregate grading, mix proportions, and richness of mix can alter concrete properties.
Admixtures can affect more than one property of concrete.
Using more than one admixture can be difficult to predict.
Caution must be exercised in selecting and predicting the effect of admixtures in concrete.