Lesson 2: Utilize Rebar Tools and Materials

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What is the main function of reinforcing steel bars (RSB) in concrete construction?

Resist tension and compression in concrete

What is the primary purpose of galvanizing steel?

To prevent corrosion

Which type of reinforcing steel bar (RSB) has a smooth surface and is typically used for reinforcing slabs on the ground?

Plain RSB

What is the main purpose of using bar chairs and spacers in concrete construction?

To maintain the thickness of concrete over the RSB

How are sizes of reinforcing steel bars (RSB) typically represented?

In metric or English systems, usually in eighths of an inch intervals

Which type of steel is ductile and malleable, making it an important element in construction?

Iron

Which process involves combining substances by melting?

Fusion

What metal characteristic refers to the ability to be drawn or stretched into a thin wire?

Ductility

Which type of reinforcing steel bar has lugs, ribs, or protrusions for increased bond with concrete?

Deformed RSB

What is the primary purpose of using bar chairs in concrete construction?

Maintain horizontal concrete cover of RSB beams

Which element is found in various forms such as diamond and graphite?

Carbon

What is the main purpose of using spacers in concrete construction?

Maintain vertical concrete cover of RSB

What is the primary role of galvanizing steel in construction?

Prevent corrosion

Which designated number corresponds to nominal diameters of reinforcing steel bars (RSB)?

Based on eighths of an inch intervals

What is the primary attribute of steel that makes it an essential material in resisting tension and compression in concrete?

Malleability

Study Notes

Round Steel and Reinforcing Steel Bars (RSB)

  • Round steel is a widely used reinforcing material for masonry and concrete construction.
  • RSB is essential in resisting tension and compression in concrete.
  • Steel is a strong alloy composed of iron, carbon, and other metals.

Alloy and Metal Characteristics

  • Alloy: Combination of two or more metals.
  • Fusion: Process of combining substances by melting.
  • Iron (Fe): Ductile and malleable element.
  • Carbon: Non-metallic element found in various forms such as diamond and graphite.
  • Metal Characteristics: Opacity, ductility, conductivity, luster.

Galvanized Steel and Corrosion

  • Galvanized Steel: Coated with zinc to prevent corrosion.
  • Corrosion: Deterioration of steel due to oxidation, forming rust.

Types of Reinforcing Steel Bars (RSB)

  • Plain RSB: Smooth surface, used for reinforcing slab on the ground.
  • Deformed RSB: Contains lugs, ribs, or protrusions for increased bond with concrete.
  • Size of RSB: Designated by number corresponding to nominal diameters.
  • Sizes represented in metric or English systems, typically in eighths of an inch intervals.

Bar Chairs and Spacers

  • Bar chairs and spacers are used to set and maintain the thickness of concrete of the RSB.
  • Bar chairs: Maintain the horizontal concrete cover of the beam bottom RSB and footing RSB.
  • Spacers: Maintain the vertical concrete cover of the RSB, footing, column, beam, etc.
  • Types of Bar Chairs and Spacers: Mortar made, Plaster made, Steel made.

Learn about the importance of round steel (rebar) in masonry and concrete construction. Understand its role in resisting tension and compression in concrete structures. Explore the composition of steel as an alloy of iron, carbon, and other metals.

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