what is cement made from?
Answers:
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Cement
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For other uses, see Cement (disambiguation).
Cement is a material used for bonding other materials together, and as a binder in concrete. 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. Portland cement is by far the most common and most important hydraulic cement in modern construction. Gypsum plaster and common lime are not hydraulic cements. Concrete is comprised of cement, mineral aggregate (gravel and sand), and other minor additives. Mortar is primarily composed of cement, lime, and sand. Grout is comprised of cement, and water, and sometimes contains fine sand and other additives.
Portland cement is made primarily from limestone, certain clay minerals, and gypsum, in a process that drives off carbonates and chemically alters the composition of the primary ingredients.
Contents [hide]
1 Other types
2 History
3 Geology
4 See also
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Other types
Slag cement is a hydraulic made using blast furnace slag which is a by product from iron making, with properties similar to portland cement.
Geopolymer cements are hydraulic cements using other mineral sources to obtain special properties.
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History
Blue Circle Southern Cement works near Berrima, New South Wales, Australia.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.
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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.
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See also
Portland Cement Association
Cement chemist notation
Portland cement
Fly ash
International Union of Bricklayers and Allied Craftworkers
Geopolymer Institute
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Other answers:
Mostly Lime
Mostly Lime
cement is made from stone which are finely powdered
i know lots of it is sand
Lime - not the fruit but the stone. It's calcium based, otherwise known as chalk.
****
Jeff_J strikes again!
He's even copied and pasted the "Your continued donations keep Wikipedia running" bit..
Does he ever come up with or even just type anything himself?
old porridge
Crushed and baked limestone.
Mole is wrong there is no sand in cement.
Portland cement ( i think that's the one that is commonly used) consists essentially of compounds of lime (calcium oxide, CaO) mixed with silica that's sand(silicon dioxide, SiO2) and alumina (aluminum oxide, Al2O3).
CEMENT IS MADE UP OF PORTLAND CEMENT,SAND,FLY ASH,AGREGATE,SAND WATER.MOLE IS CORRECT THERE IS SAND IN CEMENT AND I WILL BET RICH A COOL MILLION BUCKS ON THIS.