Steel and Concrete in Construction
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Questions and Answers

What is the main difference in the manufacturing process between steel and concrete?

  • Steel manufacturing focuses on the quality of connections between members, while concrete manufacturing focuses on the quality of cement.
  • Steel is manufactured under controlled conditions in sophisticated plants, whereas concrete involves the purchase of raw materials and mix design. (correct)
  • Steel is manufactured with predetermined properties, whereas concrete relies on the expertise of the contractor and supplier for its quality.
  • Steel production involves the use of specified raw materials, while concrete production does not require specific raw materials.

    • What does the analogy 'Cement is to concrete what flour is to a cake' imply?

  • The mix design only determines the potential quality of concrete, similar to how a recipe determines the potential taste of a cake.
  • The contractor's expertise determines the final quality of concrete, similar to how the baker's skills affect the taste of a cake. (correct)
  • The raw materials like aggregates are crucial in determining concrete strength, similar to how various ingredients affect the taste of a cake.
  • The quality of cement determines the strength of concrete, similar to how the quality of flour affects the taste of a cake.

    • What is the role of the contractor and supplier in determining the actual quality of concrete?

  • They ensure that only high-quality cement and aggregates are purchased for concrete production.
  • They play a significant role in determining the actual quality of concrete in the finished structure. (correct)
  • They determine the potential strength properties of concrete through mix design.
  • They execute proper connections between individual concrete members.

    • Why is the quality of cement hardly the cause of faults in a concrete structure?

    <p>Because there are several concrete mixes that could be employed to produce concrete of the same strength properties. (C)</p> Signup and view all the answers

    What is the matrix in a concrete mix?

    <p>The paste formed by cement and water (C)</p> Signup and view all the answers

    What is the term for freshly mixed concrete before it sets and hardens?

    <p>Wet or green concrete (A)</p> Signup and view all the answers

    What is the classification of concrete based on bulk density?

    <p>Lightweight (500-1800 kg/m3) (D)</p> Signup and view all the answers

    What does a nominal mix refer to in the context of concrete?

    <p>Mix proportions specified by the proportions of different composing materials (B)</p> Signup and view all the answers

    What is the defining criteria for good concrete?

    <p>Satisfactory in both the fresh and hardened states (A)</p> Signup and view all the answers

    What is the term for concrete placed at the site where it will be used?

    <p>In-situ concrete (B)</p> Signup and view all the answers

    What makes concrete an ideal material for building structures to control, store, and transport water?

    <p>Excellent resistance to water (A)</p> Signup and view all the answers

    Which property of concrete allows it to maintain structural integrity in a fire for 6-8 hours?

    <p>Fire resistant (D)</p> Signup and view all the answers

    What property of concrete allows it to store considerable quantities of heat from the environment?

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

    What feature offsets some of the other disadvantages of concrete?

    <p>Ability to consume waste (C)</p> Signup and view all the answers

    Why does concrete need to be reinforced with steel?

    <p>To carry the tensile stresses (A)</p> Signup and view all the answers

    What is the primary function of cement in civil engineering works?

    <p>To bond the aggregate particles together (A)</p> Signup and view all the answers

    What is the purpose of the kiln phase in cement production?

    <p>To produce clinker from the raw mix (A)</p> Signup and view all the answers

    What is a disadvantage of using formwork in concrete construction?

    <p>It is labor intensive and time consuming (C)</p> Signup and view all the answers

    Why has the Dry Process gained popularity in the manufacture of cement?

    <p>It requires lower energy consumption and is more environment-friendly (C)</p> Signup and view all the answers

    How does concrete provide protection to steel against corrosion?

    <p>By acting as a physical barrier to the ingress of aggressive species (B)</p> Signup and view all the answers

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