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What is the strongest material to build a bridge out of?

This is the awesomest prezi ever. No criticising please. Thank you.
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Room 4 Hillsborough Primary

on 12 November 2014

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Transcript of What is the strongest material to build a bridge out of?

Stone
Natural stone has been used in bridge building for centuries, making bridges last for thousands of years. Stone slab bridges, which are better for shorter bridges, last more longer than timber bridges. Because stone is very strong in compression, it can be used to make very strong arch bridges. For more strength and durability, the stones should be fit together in an arch with no mortar because mortar loosens and degrades before stone, shortening the lifespan of the bridge.
Timber
Timber bridges are nowadays used to carry pedestrians and these bridges should be kept away from water. In earlier days, most bridges were built using timber but timber bridges cannot be long-span bridges. Timber bridges are not very strong like concrete and steel because it will bend and SNAP.
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What is the strongest material to build a bridge out of?
Concrete
Concrete is commonly used in bridge construction (approximately 70 percent of the bridges in the U.S. are concrete). Concrete is extremely strong in compression, but must be reinforced with steel bars to add strength if you need to. Concrete bridges only started to get popular in the early 20th century.

Steel lets bridge designers to make even stronger bridges. It weighs less and is flexible but thick. Steel has been advanced and made even stronger in the past few years. Metals are stronger under tension than under compression. There are now over 200 bridges made of steel in the world.
The best material to build a bridge out of depends on what type of bridge it is but the strongest material would be:
steel
because i
t weighs less and is flexible but thick.
Reinforced concrete
MATERIALS
Steel
What is the best material to build a bridge out of?
Bridges made of reinforced concrete and rebars.
Reinforced concrete is concrete with rebars (reinforced bars)that are usually made of steel to increase its tensile strength. The rebars are usually embedded in the concrete before it sets. When the concrete cracks, this is when the steel bars start to work. The surface of the rebar may sometimes be patterned to work better with the concrete.
The surface of the rebar may sometimes be patterned to work better with the concrete.
RUSHith & nancya
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