Cement
From Free net encyclopedia
- For other uses, see Cement (disambiguation).
Cement is a material for bonding stone or brick. The term cement is most commonly used to refer more specifically to powdered materials which develop strong adhesive qualities when combined with water. These materials are more properly known as hydraulic cements. Hydraulic limes, natural pozzolana and Portland cements are the more common hydraulic cements, with portland cement being the most important in construction. Gypsum plaster and common lime are not hydraulic cements. Cement is an important ingredient in concrete.
History
Image:BlueCircleSouthernCementBerrimaNSW.JPG
Hydraulic cement was first invented by the Egyptians, and later reinvented by the Greeks and Babylonians, who made their mortar out of lime, much harder than the Roman mortars. Later, the Romans produced a good cement from pozzolanic ash.
Other civilizations that had a similar mold to cement were the Aztecs[1]
Portland cement was patented in England by Joseph Aspdin in 1824.
Geology
In geology, the term is used to refer to the fine-grained minerals which bind the coarser-grained matrix in sedimentary rocks. Such cements are typically composed of calcite, quartz or clay minerals.
See also
ca:Ciment da:Cement de:Zement (Baustoff) es:cemento eo:Cemento fr:ciment id:Semen lt:cementas hr:Cement nl:cement no:sement ja:セメント pl:Cement pt:cimento fi:Sementti sv:Cement zh:水泥