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?

<p>To slow the rate of hydration (D)</p> Signup and view all the answers

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

<p>Slump test (D)</p> Signup and view all the answers

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

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

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

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

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

<p>10 to 15 percent (A)</p> Signup and view all the answers

What is the effect of large air voids in concrete?

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

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

<p>Water-cement ratio (A)</p> Signup and view all the answers

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