concrete, in construction, structural material consisting of a tough, chemically inert particulate substance, known as aggregate that is connected jointly by cement and water. The bonding substance most often utilized was clay. The Egyptians developed a significance sufficiently closely comparing modern concrete by using lime and gypsum as binders.
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Lime (calcium oxide), derived from limestone, chalk, or (where obtainable) oyster shells, continued to be the primary pozzolanic, or cement-forming, agent until the early 1800s. In 1824 an English inventor, Joseph Aspin, burned and ground together with a combination of limestone and clay. This mixture, named Portland cement, has stayed the dominant cementing agent utilized in concrete production.
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Concrete is represented by the type of aggregate or cement used, by the specific grades it manifests, or by the techniques used to produce it. In normal structural concrete, the surface of the concrete is largely defined by a water-to-cement ratio. The more inferior the water content, all else being equal, the stronger the concrete.