Construction Technology: Permeability and Factors
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Questions and Answers

What do functional properties of building materials describe?

  • Only the mechanical properties
  • Chemical properties exclusively
  • Just the physical properties
  • The set of properties concerning the material’s usefulness (correct)

    • What is the main focus of physical properties of a material?

  • External appearance of the material
  • Biological aspects of the material
  • Interaction with other materials
  • Unique characteristics of the material (correct)

    • Which of the following is NOT an example of a physical property of building materials?

  • Density and porosity
  • Response to water and vapor
  • Chemical reactivity (correct)
  • Response to heat, fire, and cold

    • In what context are building materials exposed to different factors simultaneously?

    <p>When they are in use</p> Signup and view all the answers

    Which category do properties related to water absorption and permeability fall under?

    <p>Physical properties</p> Signup and view all the answers

    What do functional properties include along with physical properties?

    <p>Purpose-related properties</p> Signup and view all the answers

    How is permeability defined?

    <p>Amount of liquid or gas passing through a unit area under specified pressure difference</p> Signup and view all the answers

    What factors contribute to an increase in permeability?

    <p>Increasing pressure differential</p> Signup and view all the answers

    How can the permeability of walls be reduced?

    <p>Increasing thickness of the material</p> Signup and view all the answers

    What does the speed of water flowing through a material depend on?

    <p>Diameter of the capillaries</p> Signup and view all the answers

    What makes a material more impermeable?

    <p>Small diameter capillaries</p> Signup and view all the answers

    What aspect affects the permeability to water of a material under pressure?

    <p>Number of pores in the material</p> Signup and view all the answers

    What do mechanical properties of a material describe?

    <p>The material's ability to resist deformation under external forces</p> Signup and view all the answers

    Which of the following is considered a chemical property of a material?

    <p>Biological resistance</p> Signup and view all the answers

    What do physical properties of a material indicate?

    <p>Properties that become apparent when the material is being manufactured or processed</p> Signup and view all the answers

    Which property is NOT included in mechanical properties?

    <p>Corrosion resistance</p> Signup and view all the answers

    What does the term 'chemical/biological properties' refer to?

    <p>Material's ability to withstand environmental attacks like acids and insects</p> Signup and view all the answers

    Which property is NOT an example of physical properties?

    <p>Corrosion resistance</p> Signup and view all the answers

    What is shrinkage in construction materials?

    <p>A decrease in size due to certain processes like variations in moisture content</p> Signup and view all the answers

    What are the ingredients of fine-grained concrete with high strength steel?

    <p>Steel bars hidden in concrete</p> Signup and view all the answers

    Which material is weak in tension but strong in compression?

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

    What are some applications of the material made of cement, water, and small stones?

    <p>Early arch bridges and domes</p> Signup and view all the answers

    Which material has the strength to mold into any shape and is fireproof and weatherproof?

    <p>Fine-grained concrete with high strength steel</p> Signup and view all the answers

    What is a common weakness of fine-grained concrete with high-strength steel?

    <p>Cracks as it cools and hardens</p> Signup and view all the answers

    What are the three main ways materials may respond when exposed to fire?

    <p>Chemical decomposition, melting, considerable deformation</p> Signup and view all the answers

    How is fire-resistance rating defined?

    <p>Time of exposure to fire before strength loss</p> Signup and view all the answers

    Which type of structures have a fire-resistance rating of 0.5 hours for unprotected steel?

    <p>Steel structures</p> Signup and view all the answers

    What are examples of combustible materials mentioned in the text?

    <p>Wood, bitumen, polymers</p> Signup and view all the answers

    Which type of materials are classified as non-combustible?

    <p>Clay brick and tile</p> Signup and view all the answers

    What are fire-proof materials also known as according to the text?

    <p>Non-flammable coatings</p> Signup and view all the answers

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