Cement Chemistry and Hydration

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Questions and Answers

What is a characteristic of high alumina cement?

  • It is highly reactive and produces high early strength (correct)
  • It has low early strength
  • It is not reactive at all
  • It is not suitable for mass concrete

What is the purpose of selecting a specific type of cement?

  • To match the requirements of the construction project (correct)
  • To reduce the speed of construction
  • To reduce the strength of the concrete
  • To increase the cost of the project

What is mass concrete?

  • Any volume of concrete with small dimensions
  • Any volume of concrete with dimensions large enough to require measures to cope with heat generation (correct)
  • Any volume of concrete with large dimensions
  • Any volume of concrete with dimensions small enough to require measures to cope with heat generation

Why is it important to consider the environmental conditions when selecting a type of cement?

<p>Because some cements can restrain heat and some cannot (A)</p> Signup and view all the answers

What is the purpose of field testing of cement?

<p>To ensure the cement is suitable for minor works (A)</p> Signup and view all the answers

What should you look for when visually inspecting a bag of cement?

<p>No lumps and a greenish grey color (B)</p> Signup and view all the answers

What should you feel when thrusting your hand into a bag of cement?

<p>A cool feeling (C)</p> Signup and view all the answers

What is the texture of cement when felt between the fingers?

<p>Smooth (C)</p> Signup and view all the answers

Why is it important to select a type of cement that hardens quickly?

<p>Because some parts of the construction need to be completed quickly (B)</p> Signup and view all the answers

What is the relationship between the type of cement and the temperature?

<p>Some cements can withstand high temperatures and some cannot (A)</p> Signup and view all the answers

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