Building Materials Chapter 1
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Questions and Answers

What is the main reason for the difference in properties of carbon steel and stainless steel?

  • The variation in macro-structure
  • The difference in mineral composition
  • The change in macro-structure
  • The addition of chromium, nickel and other chemical components (correct)

    • What is the term used to describe the chemical constituents of a material?

  • Micro-structure
  • Chemical composition (correct)
  • Macro-structure
  • Mineral composition

    • What is the primary factor affecting the properties of natural stone?

  • Micro-structure
  • Meso-structure
  • Mineral composition (correct)
  • Macro-structure

    • What is the term used to describe the structure of materials that can be identified with magnifying glass or naked eyes?

    <p>Macro-structure</p> Signup and view all the answers

    What is the result of increasing carbon content in carbon steel?

    <p>Increase in strength, hardness and toughness</p> Signup and view all the answers

    What is the primary reason for the difference in characteristics of cement?

    <p>Different clinkers</p> Signup and view all the answers

    What is the level of structure that is related to the engineering level?

    <p>Macro-structure</p> Signup and view all the answers

    What is the term used to describe materials consisting of a variety of mineral compositions?

    <p>Inorganic materials</p> Signup and view all the answers

    What are the key factors affecting the properties of materials?

    <p>Chemical composition and mineral composition</p> Signup and view all the answers

    What is the term used to describe the materials consisting of monomers and compounds with a certain chemical composition and structure?

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

    What is the main characteristic of an isotropic material?

    <p>Properties are the same in all directions</p> Signup and view all the answers

    What is the minimum scale that must be considered at the engineering level?

    <p>Size of the representative cell</p> Signup and view all the answers

    What is studied at the meso-structure level?

    <p>Size, shape and interface of grains and particles</p> Signup and view all the answers

    What is the typical length of a brick at the meso-structure level?

    <p>0.225 m</p> Signup and view all the answers

    What instrument is used to study the microstructure of materials?

    <p>All of the above</p> Signup and view all the answers

    What is the characteristic of a material at the engineering level?

    <p>It is considered as a continuous and homogeneous material</p> Signup and view all the answers

    What is the shape of the representative cell of an isotropic material?

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

    What is the size of the wall thickness of a wood cell at the meso-structure level?

    <p>5 × 10^(-6) m</p> Signup and view all the answers

    What is the characteristic of a material at the microstructure level?

    <p>It is considered as a collection of individual atoms and molecules</p> Signup and view all the answers

    What is the size of the representative cell of a concrete material?

    <p>0.1 m</p> Signup and view all the answers

    What is the primary reason why atoms tend to arrange themselves in specific patterns?

    <p>To complete or fill their outermost electron orbits</p> Signup and view all the answers

    What is the result of the transfer of an electron in ionic bonding?

    <p>One atom gains an electron while one atom loses an electron</p> Signup and view all the answers

    What is the characteristic of the bonding force in covalent bonds?

    <p>It is very strong</p> Signup and view all the answers

    What is the main difference between ionic and covalent bonds?

    <p>One involves the transfer of electrons, while the other involves the sharing of electrons</p> Signup and view all the answers

    What is the 'sea of electrons' model in metallic bonding?

    <p>A model that imagines atoms sitting in a sea of valence electrons</p> Signup and view all the answers

    What is the characteristic of metal materials such as iron, steel, aluminum, and copper?

    <p>They have high thermal conductivity and electrical conductivity</p> Signup and view all the answers

    What is the difference between the strength of ionic bonds and covalent bonds?

    <p>The strength of ionic bonds and covalent bonds varies depending on the atoms involved</p> Signup and view all the answers

    What is the characteristic of the melting point of substances with ionic bonds?

    <p>It is high, but volatile</p> Signup and view all the answers

    What is the limitation of ionic bonds?

    <p>They can only occur between atoms of different elements</p> Signup and view all the answers

    What is the characteristic of the density of substances with covalent bonds?

    <p>It is high, but dependent on the atoms involved</p> Signup and view all the answers

    Study Notes

    Materials Composition and Structure

    • Materials composition includes chemical composition and mineral composition, which are key factors for the properties of materials.
    • Chemical composition refers to the chemical constituents, and varying chemical compositions result in different properties.
    • For example, increasing carbon content in carbon steel changes its strength, hardness, and toughness, making it prone to rust, which can be addressed by adding chromium, nickel, and other chemical components to create stainless steel.

    Mineral Composition

    • Many inorganic materials consist of various mineral compositions, which are key factors for the properties of some building materials (e.g., natural stone, inorganic gel, and other materials).
    • Cement exhibits different characteristics due to different clinkers.

    Structure of Materials

    • The structures of materials can be divided into macro-structure, meso-structure, and micro-structure, which are key factors related to the properties of materials.

    Macro-structure

    • Macro-structure refers to the thick structure above millimeter that can be identified with a magnifying glass or naked eyes.
    • At the engineering level, the total material is considered, and it is normally taken as continuous and homogeneous, with average properties assumed throughout the whole volume of the material body.
    • The minimum scale that must be considered is governed by the size of the representative cell, which varies from 10^(-3) m for metals to 0.1 m for concrete and 1 m for masonry.

    Meso-structure

    • Meso-structure refers to the micro-level structure that can be observed by optical microscope.
    • It includes the size, shape, and interface of grains and particles, and the size, shape, and distribution of pores and micro-cracks.
    • The material is considered as a composite of different phases, which interact to realize the behavior of the total material.

    Microstructure

    • Microstructure refers to the atomic and molecular structures of materials that can be studied by electron microscopy, X-ray diffractometer, and other means.
    • Atoms consist of a nucleus surrounded by a cloud of orbiting electrons, and the nucleus consists of positively charged protons and neutral neutrons.

    Bonding of Atoms

    • Atoms tend to arrange themselves in the most stable patterns possible, which means they have a tendency to complete or fill their outermost electron orbits.
    • Ionic bonding involves a transfer of an electron, resulting in high strength, hardness, and melting point, but also volatility and medium density.
    • Covalent bonding involves the sharing of electrons between two atoms, resulting in strong bonding force, high strength, hardness, melting point, and density.
    • Metallic bonding involves sharing electrons, resulting in volatile strength and hardness, high density, and good thermal and electrical conductivity.

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    Description

    This quiz assesses understanding of chapter one in the Building Materials course, focusing on fundamental concepts and principles. It is part of the Civil Engineering Department's First Stage-Second Semester curriculum. Topics may include materials' properties, uses, and applications.

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