Hollow Concrete Blocks and Bricks in Construction
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Questions and Answers

What is the main classification of hollow concrete blocks based on?

  • Material composition
  • Size
  • Thickness
  • Load bearing capacity (correct)
  • What is the smallest dimension of hollow concrete blocks according to EBCS?

  • 25 cm x 20 cm x 40 cm
  • 20 cm x 20 cm x 40 cm
  • 15 cm x 20 cm x 40cm
  • 10 cm x 20 cm x 40 cm (correct)
  • What is the primary material used to make bricks?

  • Clay-bearing soil, sand, and lime (correct)
  • Expanded clay aggregate
  • Concrete materials
  • Artificial stone
  • What is the term used to describe rectangular building units composed of similar materials to bricks, but larger in size?

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

    What type of bricks are made from expanded clay aggregate?

    <p>Lightweight bricks</p> Signup and view all the answers

    What is the purpose of Class A and B hollow concrete blocks?

    <p>Load bearing walls</p> Signup and view all the answers

    What is the term used to describe bricks joined together using mortar, adhesives or interlocking?

    <p>Masonry construction</p> Signup and view all the answers

    What type of bricks have been used since circa 4000 BC?

    <p>Air-dried bricks</p> Signup and view all the answers

    What is the primary reason for the popularity of hollow concrete blocks in construction?

    <p>Low cost</p> Signup and view all the answers

    What is the main advantage of using hollow concrete blocks over solid concrete blocks?

    <p>Lighter weight</p> Signup and view all the answers

    What is the primary material used in the production of concrete blocks?

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

    What is the term used to describe a concrete block with one or more hollow cavities?

    <p>Concrete masonry unit (CMU)</p> Signup and view all the answers

    What is the primary disadvantage of using hollow concrete blocks?

    <p>Weak against lateral loads</p> Signup and view all the answers

    What is the typical size of a manufactured solid concrete block?

    <p>400mmx200mmx150mm</p> Signup and view all the answers

    What is the purpose of using fresh concrete mortar between concrete blocks?

    <p>To hold the blocks together to form the desired length and height of the wall</p> Signup and view all the answers

    What is the typical lifespan of a hollow concrete block?

    <p>20+ years</p> Signup and view all the answers

    Study Notes

    Concrete Blocks and Bricks

    Popularization of Hollow Concrete Blocks

    • Hollow concrete blocks and bricks are gaining popularity in modern construction.
    • They are widely used in building residential buildings, factories, and multi-storied buildings.
    • Their low cost makes them a popular choice for compound walls.

    Characteristics of Hollow Concrete Blocks

    • Lightweight and easy to ventilate.
    • Made up of sand, cement, gravel, pumice, and water with varying mix ratios.
    • Can be classified as concrete masonry units (CMUs).
    • Most concrete blocks have one or more hollow cavities.
    • Sides can be cast smooth or with a design.

    Types of Concrete Blocks

    Classification by Weight and Shape

    • Solid concrete blocks: heavier, mostly used for load-bearing wall construction.
    • Hollow concrete blocks (HCB): lighter, more common, with one or two hollow cores.
    • HCBs are economical, need semi-skilled laborers, and have a 20+ year lifespan.

    Classification by Size or Thickness

    • Concrete blocks have three different dimensions depending on their thickness:
      • 20 cm x 20 cm x 40 cm
      • 15 cm x 20 cm x 40 cm
      • 10 cm x 20 cm x 40 cm

    Classification by Purpose

    • Hollow concrete blocks are classified into:
      • Class A and B: load-bearing HCB units, suitable for external walls, internal walls, and panels.
      • Class C and D: non-load-bearing HCB units, suitable for non-load-bearing internal panels.

    Bricks

    Definition and Characteristics

    • A brick is a building material used to make walls, pavements, and other elements in masonry construction.
    • Traditionally made of clay, but now also made of clay-bearing soil, sand, lime, or concrete materials.
    • Bricks can be joined together using mortar, adhesives, or interlocking.
    • Produced in numerous classes, types, materials, and sizes.

    Types of Bricks

    • Fired bricks: longest-lasting and strongest building materials, sometimes referred to as artificial stone.
    • Non-fired bricks: also known as mud bricks, with an additional ingredient of a mechanical binder.
    • Lightweight bricks: made from expanded clay aggregate.

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    Description

    Learn about the popularity and characteristics of hollow concrete blocks and bricks in modern construction, including their uses, composition, and benefits.

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