-Cite
Dresser, Richard C. "Asphalt." Encyclopedia Americana. 2010. Grolier Online. 1 Apr. 2010
-Summary
Assertion-Asphalt, a material used in building and paving since ancient times.
3800 B.C. used as mortar for building stones and paving blocks. It made reserviors, canals, and bathing pool watertight. About 80% of the asphalt used in the U.S. is for highways, airports, and other paving. U.S. began to use asphalt in 1870 with laying of a stretch of pavement infront of the city hall in Newark, NJ. Most asphalt used in the U.S. now comes from refining of crude petroleum. Since WW2, asphalt used for surfacing primary highways and other heavy duty roads because of its economy, speed of construction, durability, easily repaired, and riding comfort.
-Reaction
Good history. Lots of information about how asphalt is moade and refined. Some information on paving roads. (I need to read more articles and compare on this subject).
Annotated Bibliography 3:
-Cite
Cordon, William A. "Concrete." Encyclopedia Americana. 2010. Grolier Online. 30 Mar. 2010
-Summary
Assertion-Concrete is a composite material whose key ingredient is a binding medium in which small pieces of rock or ot her materials are embedded.
Stated that concrete been used by human for the past 5,000 years. Also, hisory of where and rememoriable stuctures of concrete. It explained what portland cement is made up of and how it is mixed; why cement is durable and why it shrinks and expands. It also explanned why concrete needs reinforcement.
-Reaction
There is a lot of information not needed for my paper. I need to reread highlighted areas and decided what is necessary.
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