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Limestone, diatomaceous earth, and gypsumare the principal materials used to make cement. Limestone for the CaO, diatomaceous earth as a source of finely-divided (i.e. chemically active) silica, and gypsum as a source of calcium sulphate. After firing, these materials are quite chemically active; in the presence of water; and make several complex chemicals in the setting process.
The crystals resulting from the setting are what give the resultant concrete its strength, and since these crystals take some time to form, concrete only approaches its final strength after several weeks. It is a stronger material if kept moist during this period. Excessive water however, weakens the concrete by forming voids as it evaporates. The strongest concrete mixes, such as needed for making concrete pipes, resemble merely damp gravel mix.
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What is the definition of a raw material?
See the Related Links for "Answers.com: Raw Material" to the bottom for the answer.Raw material is the set of items you would get together to use to assemble a finished producteg bricks cement sand stone water are classic examples of raw material to start building a house
Which raw material did the colonists use to make navel stores?
Pine trees
What raw material did the nubians use to make valuable products for trade?
Gold, Clay, Iron, and Copper
What is the relationship between cash crop (tobacco) and raw material?
A cash crop is one that you grow to sell rather than use yourself. A raw material is what you start with to make something else. There is no specific connection between them, but obviously a cash crop might be used as a raw material, for instance sugar cane for bioethanol.
Is cement a bad material to use?
not exactly, you can use it for holes on the road, but mainly for construction.
What raw material does a cow use?
Plant matter.
Economy where Raw material are made into usable goods?
it is a factory that make unusable stuff like pipes in things we can use
Why do you use cement?
To make sidewalks...
What material did they use to make tower bridge?
well Cement,Stainless Steel, or Steel,iron, e.t.c and much more stuff hope i helped :)
How did the use of raw material change after the war?
Raw materials were used by new southern industries.
Can you use crude oil to make substances other than fuels?
Sure. It's a common raw material for plastics for instance
Where does the raw material for aspirin come from?
The raw material for aspirin comes from the bark of the white willow tree. The medicinal use was first discovered in 1763.
