>Concrete vs. Cement

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And now, finally… We have an answer to the "What’s the difference between concrete and cement?" question.
Courtesy of the Portland Cement Association at Cement.org. Apparently, this question is asked frequently.
 
What is the difference between cement and concrete?
Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Concrete gets stronger as it gets older. Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete, just as stainless is a type of steel and sterling a type of silver. Cement comprises from 10 to 15 percent of the concrete mix, by volume. Through a process called hydration, the cement and water harden and bind the aggregates into a rocklike mass. This hardening process continues for years meaning that concrete gets stronger as it gets older. So, there is no such thing as a cement sidewalk, or a cement mixer; the proper terms are concrete sidewalk and concrete mixer.
 
You’ll also find the answer to "How cement is made" and "How you know you’re getting the amount of concrete that you have paid for", if you’re into that kind of thing.
 
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