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concrete
Title: concrete
Category: Science & Technology
Details: Words: 2017 | Pages: 8.6 (approximately 235 words/page)
concrete
Concrete is an artificial engineering material made from a mixture of Portland cement, water, fine and coarse aggregates, and a small amount of air. It is the most widely used construction material in the world. Concrete is the only major building material that can be delivered to the job site in a plastic state. This unique quality makes concrete desirable as a building material because it can be molded to virtually any form or shape. …showed first 75 words of 2017 total…
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…showed last 75 words of 2017 total…steel and concrete, the compressive stress in the concrete increases. In posttensioning, the concrete is cast around, but not in contact with, unstretched steel. The steel is stretched after the concrete has hardened by anchoring one end against the concrete and using hydraulic jacks to pull the other. After stretching, the second end is also anchored, compressing the concrete.
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**Bibliography**
"Concrete (construction)," Microsoft® Encarta® Online Encyclopedia 2001
http://encarta.msn.com © 1997-2001 Microsoft Corporation. All rights reserved.
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