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Plain or Ordinary Concrete. It is one of the most commonly used types of concrete. In this type of concrete, the essential constituents are cement , sand and coarse aggregates designed and mixed with a specified quantity of water. The ratio of essential constituents may be varied within wide limits. A very commonly used mix design, commonly known as Nominal Mix Design is 1:
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Concrete Mixer

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Concrete Background Concrete is a hardened building material created by combining a chemically inert mineral aggregate usually sand, gravel, or crushed stone , a binder natural or synthetic cement , chemical additives, and water. Although people commonly use the word "cement" as a synonym for concrete, the terms in fact denote different substances: As concrete dries, it acquires a stone-like consistency that renders it ideal for constructing roads, bridges, water supply and sewage systems, factories, airports, railroads, waterways, mass transit systems, and other structures that comprise a substantial portion of the U. According to the National Institute of Standards and Technology NIST , building such facilities is in itself one of the nation's largest industries and represents about 10 percent of the gross national product. The value of all cement-based structures in the United States is in the trillions of dollars—roughly commensurate with the anticipated cost of repairing those structures over the next twenty years. The words cement and concrete are both of Latin origin, reflecting the likelihood that the ancient Romans were the first to use the substances.
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19 Different Types of Concrete – Their Classification, Uses & Properties.

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When the earth itself was undergoing intense geologic changes natural, cement was being created. It was this natural cement that humans first put to use. Eventually, they discovered how to make cement from other materials. Concrete is a compound material made from sand, gravel and cement.
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