ARC 418 Lecture Notes - Lecture 8: De-Ice, Metakaolin, Aluminium Oxide

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Rocklike material produced by mixing coarse and fine aggregates, portland cement, and water, and allowing the mixture to harden. Process combines chemically with water to form strong crystal that bind the aggregates together. May be manufactured out of any number of raw materials combined to yield the necessary amounts of lime, iron, silica, and alumina. Lime commonly comes from limestone, marble, marl, or seashells. Iron, silica, and alumina may be provided by clay or shale. Used where the concrete will be in contact with water that has a high concentration of sulfates. Hardens more quickly than the other types and is employed in situations where a reduced curing period is desired, in the pre-casting of concrete structural elements, or when the construction schedule must be accelerated. Used in massive structures such as dams, where the heat emitted during curing may raise the temperature of the concrete to damaging levels.

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