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  • Depends on what kind of cement you are talking about: Slag cement is a class of hydraulic cement with properties similar to Portland cement, made using ground granulated blast furnace slag, a by-product from iron making. Calcium aluminate cements are hydraulic cements made primarily from limestone and bauxite. They are well-adapted for use in refractory (high-temperature resistant) concretes, e.g. for furnace linings. Geopolymer cements are made from mixtures of water-soluble alkali silicates and aluminosilicate mineral powders such as metakaolin. Tec-cement is a brand name for hydraulic cements containing reactive magnesium oxide, another hydraulic cement such as Portland cement and usually a pozzolan. Eco-cement is a brand name for hydraulic and carbonating cements containing a high proportion of reactive magnesium oxide and another hyraulic cement such as Portland cement that carbonate in a porous substrate. For some background information: 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 material to cement were the Aztecs. Portland cement was patented in England by Joseph Aspdin in 1824 under the name "Portland cement". However, this material at first corresponded in composition and properties to a Roman lime, as it had not yet been burnt to the sintering point. The artificial rock produced from it resembled Portland stone, an oölitic limestone which is quarried on the Portland peninsula in the county of Dorset and the Channel coast. When William Aspdin, the son of Joseph Aspdin, started to produce Portland cement in 1843 in a newly established works at Rotherhithe near London it became apparent, especially during the construction of the Houses of Parliament London, that this was far superior to "Roman cement". This was mainly because a considerable proportion of the mix had been sintered during the sintering process. info from wikipedia also checkout: http://www.denizlertrading.com/html/cement.html

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