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from | Encarta |  |
Concrete Bridge |
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| Modern bridge construction for the Gateway Bridge over the Brisbane River in Australia uses lightweight and durable concrete reinforced with steel bars or mesh. Concrete is made from three components: an aggregate material such as sand or gravel, water, and the binding agent, portland cement. | ||||||
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| Joyce Photographics/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Concrete (construction); Bridge (structure) | ||||||
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