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Concrete Composition and Properties

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Questions and Answers

What happens when excess water is added to the concrete mixture?

Difficulty in hydration and poor strength development
Easy consolidation and better finish
Separation and negative impact on finishing and strength (correct)
Seperation and increase in strength

What is the approximate percentage of aggregates in the total volume of concrete?

60% to 75% (correct)
50% to 60%
40% to 50%
80% to 90%

What is the primary function of superplasticizers in concrete?

To slow the rate of hydration
To increase the strength of the concrete
To increase the water content of the mixture
To reduce the water content of the mixture (correct)

What is the purpose of set-retarding admixtures in concrete?

To slow the rate of hydration (D) Signup and view all the answers

What is the most commonly used method to measure the workability of concrete?

Slump test (D) Signup and view all the answers

What is the primary purpose of an air entrained admixture in concrete?

To preserve as many smaller air voids as possible (C) Signup and view all the answers

What is the effect of excessive impurities in the water used for mixing concrete?

It affects the setting time, strength, corrosion of reinforcement, reduced durability, and staining (B) Signup and view all the answers

What is the ideal range of cement content in a typical concrete mixture?

10 to 15 percent (A) Signup and view all the answers

What is the effect of large air voids in concrete?

It results in poorly consolidated concrete and reduced strength (C) Signup and view all the answers

What is the primary factor that affects the workability of fresh concrete?

Water-cement ratio (A) Signup and view all the answers

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