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Alit in klinkere is fixed in the form of trigonal updating. In a microphoto crystals alita usually have six-coal or a squared shape. More preferably correctly generated crystals of the extended form in the size 3-20 microns favouring to increase of mark of cement.
The Bleaches-second for importance and the maintenance (20-30%) a silicate mineral klinkera. It slowly hardens, but reaches high durability at long tverdenii portlandtsementa. In an interval between normal temperature and 1500°С exists five crystal forms dvuhkaltsievogo silicate. bleaches in klinkere represents a firm solution dvuhkaltsievogo silicate and a small amount (1-3%) А12О3, Fe2O3, MgO, Cr2O3, etc. When hot klinker, left the furnace, it is gradually cooled, at temperature more low 525°С p-C2S can pass in y-C2S, and this transition is accompanied by increase bazalnogo distances, i.e. ' razryhleniem ' molecular structure belita. it is valid, the density 3-C2S is equal 3,28 гсм3, a y-C2S - 2,97 гсм3, therefore polymorphic transition causes an increment of absolute volume belita approximately on 10%, as a result of a granule klinkera are scattered in a powder. It would seem spontaneous dispergatsija facilitates crushing klinkera, but, unfortunately, the powder y-C2S at temperatures to 100°С practically does not co-operate with water, i.e. Does not possess knitting properties. Hence, it is necessary to prevent transition belita in the u-form. stabilisation f5-C2S promote some impurity which are taking root into a crystal lattice in number of 1-3%.
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