Cement in Construction
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Questions and Answers

What is Portland cement primarily composed of?

  • Magnesium silicates and magnesium aluminates
  • Calcium silicates and calcium aluminates (correct)
  • Calcium carbonates and calcium oxides
  • Silicon dioxide and calcium hydroxide

    • What is the nature of all Portland cements?

  • Exothermic
  • Hydraulic (correct)
  • Endothermic
  • Non-hydraulic

    • What is the result of the chemical reactions that occur when water is added to Portland cement?

  • The release of heat energy (correct)
  • The absorption of heat energy
  • The release of carbon dioxide
  • The formation of calcium carbonate

    • What is formed when tricalcium silicate (C3S) and dicalcium silicate (C2S) react with water?

    <p>Calcium silicate hydrates (C-S-H) and calcium hydroxide (CH)</p> Signup and view all the answers

    Why is Portland cement named as such?

    <p>It is named after the rock it resembles</p> Signup and view all the answers

    What is the chemical formula for alumina?

    <p>Al2O3</p> Signup and view all the answers

    What is the primary purpose of calcium sulfate in cement?

    <p>To slow down the setting action of cement</p> Signup and view all the answers

    What is the result of excess sulfur trioxide in cement?

    <p>The corrosion of concrete structures</p> Signup and view all the answers

    What type of cement is the most widely used?

    <p>Portland cement</p> Signup and view all the answers

    What happens when excess magnesia is present in cement?

    <p>The strength of cement decreases</p> Signup and view all the answers

    What is the result of excess alkaline matter in cement?

    <p>Efflorescence</p> Signup and view all the answers

    What is the primary function of cement in construction?

    <p>To serve as a binding medium</p> Signup and view all the answers

    What is the result of excess lime in cement?

    <p>Expansion and disintegration of the cement</p> Signup and view all the answers

    What is the typical color of cement?

    <p>Gray</p> Signup and view all the answers

    What is the process of producing cement called?

    <p>Calcination</p> Signup and view all the answers

    What is the result of a deficiency in lime in cement?

    <p>Reduced strength and faster setting</p> Signup and view all the answers

    What is the approximate percentage of silica in cement?

    <p>20% to 30%</p> Signup and view all the answers

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