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Building material in use since Roman times, made up of four main ingredients: coarse aggregate (gravel, usually between 0.5 to 1.5 inch in diameter), fine aggregate (sand, usually between 0.005 and 0.25 inch in diameter), Portland cement, and water. Air too plays an important part, and often special additives (called admixtures) are also added to improve or modify the concrete's properties. Reinforced concrete is made by embedding steel rods in concrete that improve its tensile strength.

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The use of concrete in construction was almost as old as the western world everything from houses to large office buildings had some amount of concrete in them.
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Many water dams throughout the world have been built using concrete. Without water dams, floods would occur more often, making life more difficult for humans.
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Even though it may not be the best looking a concrete structure is very sturdy and does a great job of holding a building in place.
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