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references list, better cat
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''The Assyrians and Babylonians used clay for this purpose, and the Egyptians advanced to the discovery of lime and gypsum mortar as a binding agent for building such structures as the Pyramids. The Greeks made further improvements and finally the Romans developed a cement that produced structures of remarkable durability.'' [http://www.rumford.com/articlemortar.html A History of Cement]
''The Assyrians and Babylonians used clay for this purpose, and the Egyptians advanced to the discovery of lime and gypsum mortar as a binding agent for building such structures as the Pyramids. The Greeks made further improvements and finally the Romans developed a cement that produced structures of remarkable durability.'' <ref>[http://www.rumford.com/articlemortar.html A History of Cement]</ref>
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In 1824 the English mason Joseph Aspdin registered a patent on a cement that he called Portland Cement.
In 1824 the English mason Joseph Aspdin registered a patent on a cement that he called Portland Cement.
Cement has become one of the primary building materials for buildings such as [[skyscraper]]s.
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== See also ==
== See also ==
*[http://www.britannica.com/EBchecked/topic/473488/pozzolana Pozzolana]
*[http://www.britannica.com/EBchecked/topic/473488/pozzolana Pozzolana]
[[Category:Architecture]]
== References ==
{{reflist}}
[[Category:Construction]]