Engineering Science Fair Project
Amount of sand and steel effect on the strength of concrete


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Project Information
Title: How does the amount of sand and steel affect the strength of concrete blocks?
Subject: Engineering
Grade level: Middle School - Grades 7-9
Academic Level: Ordinary
Project Type: Experimental
Cost: Low
Awards: 2nd place, Canada Wide Virtual Science Fair (2010)
Affiliation: Canada Wide Virtual Science Fair (VSF)
Year: 2010
Description: Concrete blocks were prepared with different amounts of sand and steel steel bars; after drying, the number of hits before a large crack appears in the top of the concrete block were recorded.
Link: www.virtualsciencefair.org...
Background

Reinforced Concrete

Reinforced concrete is concrete in which reinforcement bars ("rebars"), reinforcement grids, plates or fibers have been incorporated to strengthen the concrete in tension. The term Ferro Concrete refers only to concrete that is reinforced with iron or steel. Other materials used to reinforce concrete can be organic and inorganic fibres as well as composites in different forms. Concrete is strong in compression, but weak in tension, thus adding reinforcement increases the strength in tension. In addition, the failure strain of concrete in tension is so low that the reinforcement has to hold the cracked sections together. For a strong, ductile and durable construction the reinforcement shall have the following properties:

  • High strength
  • High tensile strain
  • Good bond to the concrete
  • Thermal compatibility
  • Durability in the concrete environment

In most cases reinforced concrete uses steel rebars that have been inserted to add strength.

If a material with high strength in tension, such as steel, is placed in concrete, then the composite material, reinforced concrete, resists not only compression but also bending and other direct tensile actions. A reinforced concrete section where the concrete resists the compression and steel resists the tension can be made into almost any shape and size for the construction industry.

A rebar (short for reinforcing bar), also known as reinforcing steel, reinforcement steel, or a deformed bar, is a common steel bar, and is commonly used as a tensioning device in reinforced concrete and reinforced masonry structures holding the concrete in compression. It is usually formed from carbon steel, and is given ridges for better mechanical anchoring into the concrete. In Australia, it is colloquially known as reo.

See also: Reinforced Concrete

Source: Wikipedia (All text is available under the terms of the Creative Commons Attribution-ShareAlike License)

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