cement rock

limestone

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In cement: Composition
…a compact calcareous clay, and cement rock contain both the calcareous and argillaceous components in proportions that sometimes approximate cement compositions. Another raw material is blast-furnace slag, which consists mainly of lime, silica, and alumina and is mixed with a calcareous material of high lime content. Kaolin, a white clay…
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In cement: History of cement
…naturally occurring substance called “cement rock.” These materials belong to a class known as natural cement, allied to portland cement but more lightly burned and not of controlled composition.
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