cement,binding material used in construction and engineering, typically made by heating a mixture of limestone and clay until it almost fuses and then grinding it to a fine powder. When mixed with water, the silicates and aluminates in to it undergo a chemical reaction; the resulting hardened mass is then impervious to water. It may also be mixed with water and aggregates (crushed stone, sand, and gravel) to form concrete
Modern portland cement is made by mixing substances containing lime, silica, alumina, and iron oxide and then heating the mixture until it almost fuses. During the heating process dicalcium and tricalcium silicate, tricalcium aluminate, and a solid solution containing iron are formed. Gypsum is later added to these products during a grinding process. Cement with a high aluminate content is used for fireproofing, because it is quick-setting and resistant to high temperatures; this with a high sulfate content is used in complex castings, because it expands upon hardening, filling small spaces.
10 precautions must be taken in storing cement Following 10 precautions must be taken in storing cement : Portland cement is a finely ground material. It, therefore, readily absorbs moisture even from the atmosphere. It is therefore essential to protect it from dampness during storage. Lack of proper care may cause setting of cement or […]
Learn : Different kinds of cement as per IS code :Rapid hardening or high early strength,Quick setting,High alumina,portland slag,Low heat,Air entraining Portland etc cement Different kinds of cement as per IS code Following are some of the Different kinds of cement as per IS code manufactured to suit the different requirements. Important Different kinds of […]
Continue ReadingLearn : Pozzolana, Natural Pozzolanas, Artificial Pozzolana,Clay pozzolana,cement sand mortars, Pozzolana when added to lime make it hydraulic and the resulting mortar will be stronger. POZZOLANAS These are siliceous materials having siliceous material but no binding values within themselves, will chemically react with Calcium hydroxide at ordinary temperatures and in the presence of moisture to form […]
Continue ReadingLearn : Testing portland cement,Consistency of standard cement paste with the help of Vicat’s apparatus ,Soundness.with the help of “Le Chatelier’s apparatus” TESTING PORTLAND CEMENT In this article learn 9 tests 1.samples for testing 2.Chemical composition 3.Fineness 4.Temperature for testing 5.Consistency of standard cement paste with the help of Vicat’s apparatus 6.Soundness.with the help of […]
Continue ReadingManufacturing Of Cement. Manufacturing Of Cement. by any one of the two methods : (i) Dry process, and (ii) Wet process. In both these processes the three distinct operations of (a) Mixing, Ball mill (b) Burning, Rotary kiln and (c) Grinding are carried out. 1. Dry process. In this process lime stone and clay […]
Continue ReadingOrdinary portland cement and its composition Cement, commonly used for normal construction work, is known as Ordinary Portland Cement. However, for use under specific conditions a variety of Ordinary portland cement and its composition are available these days. Its quick setting property, strength and case with which it can be used under variety of conditions […]
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