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| About Cement |
Cement in
its broadest term means any substance which acts as a binding agent for
materials natural cement (Roman Cement) is obtained by burning and crushing the
stones containing clay, carbonates of lime and some amount of carbonate of
magnesia. The clay content in such stones is about 20 to 40 percent. Natural
cement resembles very closely eminent hydraulic lime. It is not strong as artificial
cement, so it has limited use in practice.
Artificial
cement is obtained by burning at very high temperature a mixture of calcareous
and argillaceous materials in correct proportion. Calcined product is known as
clinker. A small quantity of gypsum is added to clinker and it is then
pulverized into very fine powder is known as cement. Cement was invented by a
mason Joseph Aspdin of leeds in England in 1824. The common variety of
artificial cement is known as normal setting cement or ordinary cement or Portland
cement.
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