Cement

cement: In the most general sense of the word, a cement is a takeer, a substance which identifys and hardens independently, and can mystify other materials together. The volcanic ash and pulverized brick additives which were added to the burnt lime tree to obtain a hydraulic binder were later referred to as cement. Cements used in construction be characterized as hydraulic or non-hydraulic. The most important use of cement is the tailor of mortar and concrete. Composition of Cements The essential raw ingredients of Portland cement ar limestone, 60 to 65%, alumina (A12O3) 4 to 8% atomic number 14 dioxide (SiO2) 20 to 25%, Ferrous Oxide (Fe2O3) 2 to 4 % and magnesium Oxide (MgO) 1 to 3%. The alumina and silica are unremarkably found combined as clay, which is a silicate of aluminum (Al2O32SiO2) + 2H2O. both last(predicate) cements contain other ingredients due to the essential materials non macrocosm consummate(a) in nature and from contact with fuel in calcina tions. some(a) of these accidental ingredients may improve the cement, others are sluggish and spotless except that they exist in such mensuration as to displace essential ingredients, and others are positively harmful, if resign in quantity, because of the chemical action they produce. There are accidental ingredients usually amounting to about 5%, but these must not embarrass everyplace 1.75% anhydrous sulphuric acid (So3), nor over 3% of magnesia (MgO).

Excess of clay causes a cement to set quickly, while excess of lime causes it to set easy or imperfectly. Iron oxide gives cement its color. Types of Cement 1. hydraulic cement 2. Non-hydraulic Cement 3. Ordina! ry portland cement 4. rapid hardening cement 5. exalted alumina cement 6. Low heat cement 7. rapidly setting cement 8. Portland pozzolana cement 9. Blast furnace cement 10. pureness cement 11. Colored cement 12. Sulphate resisting cement 1. hydraulic Cement Major application of hydraulic cement is for the duplicity of concrete and mortar. It bonds the aggregate to...If you want to get a expert essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay